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1. Multi-objective Optimization Design of Inset-surface Permanent Magnet Machine Considering Deterministic and Robust Performances* Gaohong Xu, Zexin Jia, Wenxiang Zhao, Qian Chen, Guohai Liu 中国电气工程学报（英文）    2021, 7 (3): 73-87.   DOI: 10.23919/CJEE.2021.000027 摘要 （564）      PDF    可视化    收藏 The inset-surface permanent magnet (ISPM) machine can achieve the desired electromagnetic performance according to the traditional deterministic design. However, the reliability and quality of the machine may be affected by the essential manufacturing tolerances and unavoidable noise factors in mass production. To address this weakness, a comprehensive multi-objective optimization design method is proposed, in which robust optimization is performed after the deterministic design. The response surface method is first adopted to establish the optimization objective equation. Afterward, the sample points are obtained via Monte Carlo simulation considering the design-variable uncertainty. The Design for Six Sigma approach is adopted to ensure the robustness of the design model. Furthermore, the barebones multi-objective particle swarm optimization algorithm is used to obtain a compromise solution. A prototype is manufactured to evaluate the effectiveness of the proposed method. According to the finite-element analysis and experimental tests, the electromagnetic performance and reliability of the machine are significantly enhanced with the proposed method. 参考文献 | 相关文章 | 多维度评价

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2. Analytical Analysis and Performance Characterization of Brushless Doubly Fed Induction Machines Based on General Air-gap Field Modulation Theory* Peng Han, Ming Cheng, Xinkai Zhu, Zhe Chen 中国电气工程学报（英文）    2021, 7 (3): 4-19.   DOI: 10.23919/CJEE.2021.000021 摘要 （687）      PDF    可视化    收藏 Air-gap magnetic field modulation has been widely observed in electric machines. In this study, we present an analytical analysis and performance characterization of brushless doubly fed induction machines (BDFIMs) fed by two independent converters from the perspective of air-gap field modulation. The spiral-loop winding is studied in detail as an example to show the generalized workflow that can also be used to analyze other short-circuited rotor winding types, such as nested-loop and multiphase double-layer windings. Magnetic field conversion factors are introduced to characterize the modulation behavior of special rotor windings and facilitate their comparison in terms of cross-coupling capability, average torque, and harmonic content of the air-gap flux density waveforms. The stator magnetomotive force (MMF), rotor MMF, and resultant air-gap MMF are considered, based on which the closed-form inductance formulas are derived, and the torque equation is obtained along with the optimal current angle for maximum torque operation by using the virtual work principle. The design equations are then developed for the initial sizing and geometry scaling of the BDFIMs. Transient finite element analysis and experimental measurements are performed to validate the analysis. 参考文献 | 相关文章 | 多维度评价

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3. Editorial for the Special Issue on Advanced Electric Machines and Drives for Battery, Hybrid, and Fuel Cell Electric Vehicles 中国电气工程学报（英文）    2021, 7 (3): 1-3.   DOI: 10.23919/CJEE.2021.000020 摘要 （324）      PDF    可视化    收藏 相关文章 | 多维度评价

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4. Quasi-Z-Source Based Bidirectional DC-DC Converter and Its Control Strategy Yuba Raj Kafle*, Saad Ul Hasan, Graham E. Town 中国电气工程学报（英文）    2019, 5 (1): 1-10.   摘要 （648）      PDF    可视化    收藏 This paper presents a quasi-Z-source based isolated bidirectional DC-DC converter (qZIBDC) for renewable energy applications. The converter utilizes a dual active bridge circuit with a quasi-Z-source network on both sides, so the converter works as buck/boost converter from either side. It has a wider input/output voltage operating range, soft-switching capabilities without additional devices, and higher boost capability than a traditional dual active bridge circuit. Apart from that, shoot-through states are incorporated in its operating cycle to boost the input voltage resulting in high reliability of the proposed converter. Due to the symmetrical structure of the circuit, there is no defined high voltage or low voltage side as in traditional isolated bidirectional DC-DC converter. The operating principle and control strategy of the proposed converter are presented. Simulation and experimental results are provided to verify the effectiveness of the proposed converter topology and its control strategy. 参考文献 | 相关文章 | 多维度评价

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5. Online Monitoring Method Based on Locus-analysis for High-voltage Cable Faults Wei Zhao, Xiangyang Xia, Mingde Li, Hai Huang, Shanqiu Chen, Ruiqi Wang, Yan Liu 中国电气工程学报（英文）    2019, 5 (3): 42-48.   DOI: 10.23919/CJEE.2019.000019 摘要 （418）      PDF    可视化    收藏 Online diagnosis methods for high-voltage (HV) cable faults have been extensively studied. Power cable fault monitoring is not accurate, and the degree of data fusion analysis of current methods is insufficient. To address these problems, an online monitoring method based on the locus-analysis for HV cable faults is developed. By simultaneously measuring two circulating currents in a coaxial cable, a two-dimensional locus diagram is drawn. The fault criteria and database are established to detect the fault by analyzing the changes of the locus characteristic parameters. A cross-connected grounding simulation model of a high-voltage cable is developed, and several faults at different locations are simulated. Fault identification is established based on the changes in the long axis, short axis, eccentricity, and tilt angle of the track. The simulation and field experiments show that this method can provide an increased amount of fault-monitoring reference information, which can improve the monitoring accuracy and provide a new approach to cable fault monitoring. 参考文献 | 相关文章 | 多维度评价

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6. Effect of Salty Fog on Flashover Characteristics of OCS Composite Insulators* Sihua Wang, Youlong Wu 中国电气工程学报（英文）    2019, 5 (3): 59-66.   DOI: 10.23919/CJEE.2019.000021 摘要 （390）      PDF    可视化    收藏 To study the flashover characteristics of the fog water in saline-alkali areas for high-speed railway OSC insulators, the spatial distributions of both the potential and electric field of soiled insulators in the presence of salty fog are analyzed using COMSOL Multiphysics, a multi-physics coupling software. Furthermore, to analyze the effect of the contamination of insulators due to salty fog water , a saline solution is used for staining an insulator sample by using the solid coating method. In an artificial climate chamber, the salty fog environment is simulated, and the flashover voltage for different salty fog water conductivities and surface staining are obtained. The salt-density correction coefficient K is also proposed. It provides a strong basis for the selection of railway insulators in saline-alkali areas. The results show that the salty fog water changes the original surface equivalent salt density, ρESDD, by wetting the existing fouling layer on the surface of the insulator, so that the original surface contamination layer becomes equivalent to KρESDD; the smaller is the value of ρESDD of the insulator surface, the larger is the value of K; the surface of the same insulator is dirty, and as the concentration of salty fog-water increases, K also increases. 参考文献 | 相关文章 | 多维度评价

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7. Overview on Submodule Topologies, Modeling, Modulation, Control Schemes, Fault Diagnosis, and Tolerant Control Strategies of Modular Multilevel Converters* Fujin Deng, Yongqing Lü, Chengkai Liu, Qian Heng, Qiang Yu, Jifeng Zhao 中国电气工程学报（英文）    2020, 6 (1): 1-21.   DOI: 10.23919/CJEE.2020.000001 摘要 （467）      PDF    可视化    收藏 In the present scenario, modular multilevel converters (MMCs) are considered to be one of the most promising and effective topologies in the family of high-power converters because of their modular design and good scalability; MMCs are extensively used in high-voltage and high-power applications. Based on their unique advantages, MMCs have attracted increasing attention from academic circles over the past years. Several studies have focused on different aspects of MMCs, including submodule topologies, modeling schemes, modulation strategies, control schemes for voltage balancing and circulating currents, fault diagnoses, and fault-tolerant control strategies. To summarize the current research status of MMCs, all the aforementioned research issues with representative research approaches, results and characteristics are systematically overviewed. In the final section, the current research status of MMCs and their future trends are emphasized. 参考文献 | 相关文章 | 多维度评价

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8. Design Optimization and Comparison of Linear Magnetic Actuators under Different Topologies* Zhijian Ling, Jinghua Ji, Tao Zeng, Wenxiang Zhao 中国电气工程学报（英文）    2020, 6 (1): 41-51.   DOI: 10.23919/CJEE.2020.000003 摘要 （316）      PDF    可视化    收藏 In this study, several types of linear actuators that adopt different permanent-magnet (PM) topologies are studied and compared. These linear actuators are based on the concept of PM magnetic screw transmission, which offers high force density, high reliability, and overload protection. Using different magnetic configurations and assembly methods, these linear actuators are designed and optimized for a fair comparison. Initially, based on the operating principle and maximum thrust force, the surface-mounted magnetic screw is described and optimized. Furthermore, the embedded magnetic screw, Halbach array magnetic screw, and field modulated magnetic screw are investigated and compared. Their electromagnetic performances, such as thrust force, torque, magnetic losses, and demagnetization effects are analytically assessed and verified using finite-element analysis. Finally, a prototype of the surface-mounted magnetic screw is developed to validate the predictions. 参考文献 | 相关文章 | 多维度评价

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9. Optimization of Wind Farm Collection Line Structure under Symmetrical Grid Fault* Huan Jin, Xueyi Zhang, Yang Zhang, Qianghui Xiao, Juan Li, Ya Liu 中国电气工程学报（英文）    2019, 5 (3): 49-58.   DOI: 10.23919/CJEE.2019.000020 摘要 （266）      PDF    可视化    收藏 A power-transmission collection line is connected to each wind turbine of a wind farm and then connected to the incoming switchgear at the low-voltage side of the booster station at a certain distance. Therefore, the grouping of the wind turbines in the wind farm determines the layout of the lines and affects the line impedance. The line structure and composition of the wind farm are analyzed, and the relationship between the impedance of the collection line and reactive power generated by the wind turbine at low-voltage ride through is derived. We conclude that the smaller the equivalent impedance of the wind farm collection line structure is, the greater the reactive power at the wind farm collection line point is. In addition, the economic aspect of the collection line needs to be considered in the design. The economic aspect and impedance values have contrasting characteristics. Therefore, according to the condition of minimum impedance and optimized economic aspect, an optimization model of a wind-farm collector-circuit structure is proposed. The optimal structure of the wind farm collector circuit is calculated using the Monte Carlo method, and the theoretical analysis is verified by simulation. 参考文献 | 相关文章 | 多维度评价

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10. Impact of Non-ideal Waveforms on GaN Power FET in Magnetic Resonant Wireless Power Transfer System* Shizhen Huang, Jianshan Zhang, Wengang Wu, Ling Xia 中国电气工程学报（英文）    2019, 5 (3): 30-41.   DOI: 10.23919/CJEE.2019.000018 摘要 （316）      PDF    可视化    收藏 GaN field-effect transistors (FET) have low conduction and switching losses in high-frequency (>MHz) resonant wireless power transfer systems. Nevertheless, such systems impose a unique stress on GaN FETs owing to their non-ideal voltage waveforms. In this work, we report the observed non-ideal behavior in a 6.78 MHz magnetic resonant wireless transfer system that employs class-D GaN power amplifiers. The non-ideal waveform phenomenon existing at the output of the power amplifier is explained. The study analyzes the causes of this phenomenon, including the coupling coefficient k of the coil, the DC input voltage of the amplifier, and the load on the receiver. Each parameter is simulated and analyzed using LTspice. The influence of the phenomenon on the on-state resistance of the GaN device is proved in an experimental measurement, and the cause of the phenomenon is explained. The study combines a theoretical simulation and an experimental test to discuss the effect of this phenomenon on GaN power devices and proposes the corresponding solutions, which include the limitation of voltage, current, and power of the system, thermal management, and other protection measures. 参考文献 | 相关文章 | 多维度评价

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11. Simplified Analytical Model for Estimation of Switching Loss of Cascode GaN HEMTs in Totem-pole PFC Converters* Qiqi Li, Bangyin Liu, Shanxu Duan 中国电气工程学报（英文）    2019, 5 (3): 1-9.   DOI: 10.23919/CJEE.2019.000015 摘要 （384）      PDF    可视化    收藏 A practical analytical model to calculate the switching loss of cascode gallium nitride high electron mobility transistors (GaN HEMTs) is proposed. To facilitate analysis and application, the transmission delays introduced by Si MOSFET and interconnection inductances are ignored in modeling. Meanwhile, the nonlinear junction capacitances of the device and circuit stray inductances are also incorporated to increase the accuracy of the model. The turn-on and turn-off switching processes are described in detail and the simplified equations can be easily solved by using mathematical tools. Based on the analytical model, loss evaluation of totem-pole PFC converter is introduced briefly. Finally, the accuracy of the model is validated by comparing the calculated loss and converter’s efficiency with experiment results. Peak efficiency of 99.26% is achieved for a 3.6 kW single phase CCM Totem-Pole PFC AC/DC converter switching at 50 kHz based on 650 V cascode GaN HEMTs. 参考文献 | 相关文章 | 多维度评价

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12. Double-loop Control Structure Using Proportional Resonant and Sequence-decoupled Resonant Controllers in Static Coordinates for Dynamic Voltage Restorer Vu Thai Hung, Hongchun Shu, Le Ngoc Giang, Nguyen Duc The 中国电气工程学报（英文）    2019, 5 (3): 10-19.   DOI: 10.23919/CJEE.2019.000016 摘要 （396）      PDF    可视化    收藏 Among incidents on grids, the sag/swell voltage is considered as the most frequent incident. To solve this problem, custom power devices are used. In particular, the dynamic voltage restorer (DVR) is a modern and efficient customer device. DVRs are used to mitigate voltage sag/swells and harmonics on the load bus, thus protecting the sensitive loads. The DVR is a serial compensator that applies a voltage to the point of common coupling to maintain the voltage of sensitive load at the nominal value. To improve the performance of DVRs, in this study, the control strategy of the two-stage loop circuit is implemented. The external voltage control loop uses a sequence-decoupled resonant (SDR) controller, and the inner current-control loop uses the proportional resonant (PR) controller implemented in the stationary frame αβ. 参考文献 | 相关文章 | 多维度评价

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13. Review of Si IGBT and SiC MOSFET Based on Hybrid Switch* Puqi Ning, Tianshu Yuan, Yuhui Kang, Cao Han, Lei Li 中国电气工程学报（英文）    2019, 5 (3): 20-29.   DOI: 10.23919/CJEE.2019.000017 摘要 （388）      PDF    可视化    收藏 SiC Hybrid switch (HyS) combines low conduction loss of Si IGBT and low switching loss of SiC MOSFET, and the cost is closer to that of Si IGBT. The promising high performances of HyS will bring considerable achievement in terms of enhancing power density of a converter system. By reviewing the gate drive pattern, gate drive hardware, current sharing, module design, converter design, and cost, this paper introduces state-of-the-art SiC HyS. 参考文献 | 相关文章 | 多维度评价

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14. Direct Current Control Strategy of SVG Based on Dual Sequence dq Coordinates Under Asymmetric Load Condition* Shicheng Zheng*, Zhuangzhuang Li, Menglin Cao 中国电气工程学报（英文）    2019, 5 (1): 24-35.   摘要 （528）      PDF    可视化    收藏 In the case of asymmetric loads of power grid, load currents are composed of four components: positive sequence active and reactive components and negative sequence active and reactive components that can pollute the power grid with harmonics and reactive power and interrupt the normal operation of power grid. Therefore, increasing numbers of static var generators (SVGs) are used to stabilize the power grid. In this study, a new type of current compensation control strategy of a three-phase three-wire SVG under an asymmetric load is proposed. According to the symmetric component method and dual dq synchronous transformation theory, the load currents are transformed into four components under dual dq coordinates. Each component is compensated separately by the SVG. Simultaneously, the proportional-limiter method is adopted to minimize the harmonics from the SVG by optimizing the waveform of the modulation wave and limiting its amplitude. Finally, the validity and feasibility of the control strategy are verified by simulation and experimental results. 参考文献 | 相关文章 | 多维度评价

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15. Influence of Magnet Shape on the Cogging Torque of a Surface-mounted Permanent Magnet Motor* Min Zhou, Xinxing Zhang, Wenxiang Zhao, Jinghua Ji, Jingning Hu 中国电气工程学报（英文）    2019, 5 (4): 40-50.   DOI: 10.23919/CJEE.2019.000026 摘要 （347）      PDF    可视化    收藏 The influence of bread-loaf shaped magnet poles under parallel magnetization on the cogging torque of surface-mounted permanent magnet (SPM) motors is studied. For the SPM motors having magnetic poles with eccentricity and sine harmonic compensation, the electromagnetic performances of integer and fractional slot motors are compared. It is found that the cogging torque and torque ripple of the integer and fractional slot motors can be reduced with the same eccentric magnet pole. The cogging torque and torque ripple of a fractional slot motor can be decreased by sine harmonic compensation, however, the same sine harmonic compensation has a small influence in integer slot motors. By varying the magnetic poles, the contribution of the field harmonics (k = (2n + 1) p), which are a direct result of magnet magnetization, to the cogging torque also changes. The electromagnetic performance of a 3 kW prototype is tested, and it is found that the experimental results validate the theoretical investigation. 参考文献 | 相关文章 | 多维度评价

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16. Open-circuit Fault Diagnosis of Traction Inverter Based on Compressed Sensing Theory* Yongqi Cheng, Weiguang Dong, Fengyang Gao, Guoqing Xin 中国电气工程学报（英文）    2020, 6 (1): 52-60.   DOI: 10.23919/CJEE.2020.000004 摘要 （355）      PDF    可视化    收藏 This study proposes a new method of fault diagnosis based on the least squares support vector machine with gradient information (G-LS-SVM) to solve the insulated-gate bipolar transistor(IGBT) open-circuit failure problem of the traction inverter in a catenary power supply system. First, a simulation model based on traction inverter topology is built, and various voltage fault signal waveforms are simulated based on the IGBT inverter open-circuit fault classification. Second, compressive sensing theory is used to sparsely represent the voltage fault signal and make it a fault signal. The new method has a high degree of sparseness and builds an overcomplete dictionary model containing the feature vectors of voltage fault signals based on a double sparse dictionary model to match the sparse signal characteristics. Finally, the space vector transform is used to represent the three-phase voltage scalar in the traction inverter as a composite quantity to reduce the redundancy of the fault signals and data-processing capabilities. A G-LS-SVM fault diagnosis model is then built to diagnose and identify the voltage fault signal feature vector in an overcomplete dictionary. The simulation results show that the accuracy of this method for various types of IGBT tube fault diagnosis is over 98.92%. Moreover, the G-LS-SVM model is robust and not affected by Gaussian white noise. 参考文献 | 相关文章 | 多维度评价

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17. Stability Analysis of Sampled-data Control System and Its Application to Electric Power Market* Tian Zhang, Shenping Xiao 中国电气工程学报（英文）    2020, 6 (1): 61-70.   DOI: 10.23919/CJEE.2020.000005 摘要 （371）      PDF    可视化    收藏 The stability of sampled-data systems is investigated using a new type of Lyapunov functional. The interval from the sampling point tk to tk+1 is assumed to be a sampling interval. By fully utilizing the characteristic information on the whole sampling interval, a new two-sided closed-loop Lyapunov functional is proposed, which utilizes the information on both the intervals from the sampling point t to tk and from t to tk+1. Based on the two-sided closed-loop Lyapunov functional and modified free-matrix-based inequality, a less conservative stability criterion is derived for a sampled-data control system, and three numerical examples are provided to verify the effectiveness and reduced conservativeness of the proposed method. Furthermore, the proposed method is applied to solve the stability problem of electric power markets, and the practical significance of reducing the conservativeness is discussed. 参考文献 | 相关文章 | 多维度评价

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18. Active Disturbance Rejection Position Servo Control of PMSLM Based on Reduced-order Extended State Observer* Ming Li, Jiwen Zhao, Yuepeng Hu, Zhen Wang 中国电气工程学报（英文）    2020, 6 (2): 30-41.   DOI: 10.23919/CJEE.2020.000009 摘要 （313）      PDF    可视化    收藏 To enhance the control accuracy of permanent magnet synchronous linear motor (PMSLM) servo systems affected by disturbances, such as time-varying parameters and abrupt load changes, an active disturbance rejection control (ADRC) algorithm based on a reduced-order extended state observer (ESO) is adopted to suppress the disturbances on the control system. First, the system's ability to estimate disturbances is enhanced by linearizing the ESO. Second, the pole placement method is used for the construction of a reduced-order ESO that can reduce the influence of the number of adjustment parameters and the phase lag. The parameters of the reduced-order ADRC are adjusted, the optimal control parameters are selected, and the stability of controller is proved. Finally, practical experiments prove that the proposed method can improve control accuracy under multiple working conditions and features strong anti-interference ability. There is a smaller steady-state error, and no overshoot is observed. 参考文献 | 相关文章 | 多维度评价

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19. Design and Analysis of a Wireless Power Transmission System with Magnetic Coupling Resonance in the Weak-coupling Region* Dawei Song, Fengdong Shi, Shuailong Dai, Lai Liu 中国电气工程学报（英文）    2019, 5 (4): 51-60.   DOI: 10.23919/CJEE.2019.000027 摘要 （214）      PDF    可视化    收藏 The magnetically coupled resonant wireless power transfer (MCR-WPT) system for implantable medical devices has gradually become one of the research hotspots. The transmission characteristics of the system in weak-coupling regions are of research significance. The mathematical model of the system's transmission characteristics is established by equivalent circuit theory. Several key factors that affect the transmission characteristics of the system are obtained, to include the self-inductance of the coil, the mutual inductance between the coils, and the load resistance. A magnetically coupled resonant wireless power transfer system is designed. A method of coil design is proposed. The transmission efficiency of the system in the weak-coupling region is improved by optimizing the design of the coil. Simulation and experimental results exhibited good consistency. The results show that the transmission performance of the system in the weak-coupling area is improved. This work provides guidance and practical significance for the research of the MCR-WPT system with implantable medical equipment. 参考文献 | 相关文章 | 多维度评价

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20. An Integrated Reactive Power Control Strategy for Improving Low Voltage Ride-through Capability Ehsan Gatavi, Ali Hellany, Mahmood Nagrial, Jamal Rizk 中国电气工程学报（英文）    2019, 5 (4): 1-14.   DOI: 10.23919/CJEE.2019.000022 摘要 （285）      PDF    可视化    收藏 Among all renewable energies, wind power is rapidly growing, whereby it has the most participation to supply power. Doubly fed induction generator (DFIG) is the most popular wind turbine, as it can play a very significant role to enhance low voltage ride through (LVRT) capability. Ancillary services such as voltage control and reactive power capability are the main topics in wind power control systems that should be handled profoundly and carefully. The lack of reactive power during fault period can result in instability in generators and/or disconnection of the wind turbine from the power system. The main aims of this study are to illustrate the most effective approaches subject to improve the efficiency, stability, and reliability of wind power plant associated with LVRT capability enhancement. This effectiveness and efficiency are demonstrated by, firstly, comparison between all types of wind turbines, focusing on the ancillary services, after the existing advanced control strategies. According to the literature, there is a consensus that modifying converter-based control topology is the most effective approach to enhance LVRT capability in DFIG-based wind turbine (WT). Therefore, an advanced integrated control strategy is designed by considering the effect of the rotor side converter (RSC) and the grid side converter (GSC). A model of the wind power plant is presented based on the control objectives. MATLAB/Simulink is also used to illustrate the effectiveness of the designed algorithm. 参考文献 | 相关文章 | 多维度评价

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21. Vector Control Strategy of a T-type Three-level Converter Driving a Switched Reluctance Motor* Mingyao Ma, Zhuangzhi Wang, Qingqing Yang, Shuying Yang, Xing Zhang 中国电气工程学报（英文）    2019, 5 (4): 15-21.   DOI: 10.23919/CJEE.2019.000023 摘要 （433）      PDF    可视化    收藏 A novel 12 voltage vector control strategy for switched reluctance motors (SRM) with a T-type three-level converter is proposed in this study. Based on a causal analysis of torque ripple under the control of conventional six voltage vectors, six new voltage vectors are added for further reduction of torque ripple. An optimized control rule is adopted based on the division method of the 12 new voltage vectors. A zero-voltage vector is used to adjust the duration of the 12 voltage vectors, the time of which is varied at different parts of the vector sectors according to the torque error. In addition, the windings are connected in a delta configuration, therefore, the number of connections between the converter and SRM is reduced. Finally, the results of MATLAB/Simulink and RT-LAB are presented to verify the validity of the proposed scheme. 参考文献 | 相关文章 | 多维度评价

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22. A Missing Power Data Filling Method Based on Improved Random Forest Algorithm* Wei Deng, Yixiu Guo, Jie Liu, Yong Li, Dingguo Liu, Liang Zhu 中国电气工程学报（英文）    2019, 5 (4): 33-39.   DOI: 10.23919/CJEE.2019.000025 摘要 （304）      PDF    可视化    收藏 Missing data filling is a key step in power big data preprocessing, which helps to improve the quality and the utilization of electric power data. Due to the limitations of the traditional methods of filling missing data, an improved random forest filling algorithm is proposed. As a result of the horizontal and vertical directions of the electric power data are based on the characteristics of time series. Therefore, the method of improved random forest filling missing data combines the methods of linear interpolation, matrix combination and matrix transposition to solve the problem of filling large amount of electric power missing data. The filling results show that the improved random forest filling algorithm is applicable to filling electric power data in various missing forms. What’s more, the accuracy of the filling results is high and the stability of the model is strong, which is beneficial in improving the quality of electric power data. 参考文献 | 相关文章 | 多维度评价

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23. MESO-based Robustness Voltage Sliding Mode Control for AC Islanded Microgrid Hao Pan, Qingfang Teng, Dangdang Wu 中国电气工程学报（英文）    2020, 6 (2): 83-93.   DOI: 10.23919/CJEE.2020.000013 摘要 （274）      PDF    可视化    收藏 A new modified extended state observer (MESO)-based robustness voltage sliding mode control (SMC) strategy is proposed for an AC islanded microgrid under system uncertainties including system parameter and load variation. First, the disturbance effect on the system is regarded as a lumped uncertainty, and a state space model of the uncertain islanded microgrid system is established. Then, a modified extended state observer is designed to estimate external disturbances and internal perturbation. Finally, considering the lumped uncertainty, a sliding mode controller with a multi-power reaching law is proposed to enable the output voltage of the system to track its reference voltage rapidly and accurately, and to enhance the robustness of the system. The simulation results confirm that the proposed robustness voltage control strategy can perform satisfactory voltage control and demonstrate a strong capability to reject parameter and load variation. 参考文献 | 相关文章 | 多维度评价

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24. Magnetic Field Analytical Model for Magnetic Harmonic Gears Using the Fractional Linear Transformation Method Yuejin Zhang, Junda Zhang, Ronghui Liu 中国电气工程学报（英文）    2019, 5 (1): 47-52.   摘要 （231）      PDF    可视化    收藏 Magnetic harmonic gears with high gear ratios exhibit high torque densities. However, the revolution and rotation of the eccentric rotor makes the magnetic field analysis complex. In this study, an analytical model of magnetic fields for magnetic harmonic gears is developed by using the fractional linear transformation method. The transformation formula is accurate in theory and suitable for the analysis of magnetic fields with large eccentricity. The rotor eccentricity region in the z-plane is mapped onto a uniform region in the w-plane. The magnetic field solutions are obtained by modulating the magnetic field distributions without rotor eccentricity with the relative permeance function derived from the effect of rotor eccentricity. The torque of magnetic harmonic gears is calculated from the radial and tangential components of the air-gap magnetic fields. Results of the finite element method and prototype test confirm the validity of the analytical prediction. 参考文献 | 相关文章 | 多维度评价

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25. Analysis and Comparison of Two Wireless Battery Charger Arrangements for Electric Vehicles Giuseppe Buja, Rupesh K. Jha, Manuele Bertoluzzo, Mude K. Naik 中国电气工程学报（英文）    2015, 1 (1): 50-57.   摘要 （102）      PDF    可视化    收藏 The paper deals with wireless battery chargers (WBCs) for plug-in electric vehicles (PEVs) and analyzes two arrangements for the receiver of a series-series resonant WBC. The first arrangement charges the PEV battery in a straightforward manner through a diode rectifier. The second arrangement charges the PEV battery through the cascade of a diode rectifier and a chopper whose input voltage is kept constant. Figures of merit of WBCs such as efficiency and sizing factor of both the power source and the transmitter/receiver coils are determined. Afterwards, they are discussed and compared with reference to the case study of WBC for an electric city car. A proposal to optimize the efficiency of the second arrangement by a suitable selection of the chopper input voltage is presented. Measurements on the efficiency of the two arrangements are included to support the theoretical results. 参考文献 | 相关文章 | 多维度评价

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26. Small Signal Stability of Three-phase and Six-phase Synchronous Motors: A Comparative Analysis G. K. Singh, Arif Iqbal 中国电气工程学报（英文）    2020, 6 (1): 22-40.   DOI: 10.23919/CJEE.2020.000002 摘要 （315）      PDF    可视化    收藏 Small signal stability analysis is conducted for an asymmetrical six-phase synchronous motor in comparison with its equivalent three-phase counterpart. For this purpose, a linearized model of the six-phase synchronous motor is developed using the dq0 approach, which is used in eigenvalue criteria to determine absolute stability in comparison with its equivalent three-phase counterpart. The analysis includes a comparison of the variation in evaluated eigenvalues associated with the stator and rotor sides according to changes in both the three and six-phase machine parameters and working conditions. Key analytical results are experimentally investigated and validated on a test rig. 参考文献 | 相关文章 | 多维度评价

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27. Improved Model Predictive Direct Power Control of Grid Side Converter in Weak Grid Using Kalman Filter and DSOGI* Liang Chen, Heng Nian, Yunyang Xu 中国电气工程学报（英文）    2019, 5 (4): 22-32.   DOI: 10.23919/CJEE.2019.000024 摘要 （262）      PDF    可视化    收藏 When grid side converter (GSC) is connected to weak grid, the small signal instability can happen due to terminal characteristics of the GSC that are incompatible with the grid impedance. This issue is not of wide concern in previous studies of direct power control (DPC) of GSC. By small signal analysis, it is shown that the impedance characteristic of the conventional direct power control GSC is not compatible with the inductive grid impedance in weak grid due to its constant power load behavior. To solve the problem, instead of feeding the DPC controller with direct measured voltage and current, a Kalman filter (KF) is used to obtain filtered output current and a double second-order generalized integrator (DSOGI) is used to obtain filtered voltage at the point of common coupling (PCC). These strategies change the impedance characteristic of the GSC dramatically and make it suitable to operate in weak grid where SCR is 2, while the rapid power response is preserved. The proposed strategy is verified through simulation and controller hardware in loop (CHIL) tests. 参考文献 | 相关文章 | 多维度评价

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28. Analysis of Vibration and Noise of Induction Motor Equipped with Concentric Single-Double-Layer Star-Delta Winding* Zechen Li, Chong Di, Xiaohua Bao 中国电气工程学报（英文）    2019, 5 (1): 36-46.   摘要 （233）      PDF    可视化    收藏 Compared with changing the structure of a motor that has been manufactured, changing the type of stator winding is an economical and time-saving method to reduce the vibration and noise. Thus, a concentric single-double-layer star-delta (CSDLSD) winding for an induction motor is described in this paper with the aim of reducing the noise of the motor. By planning the turns relationship between the two parts of the winding, the harmonic component of the air-gap magnetic field can be decreased. Besides this, through adjusting the turns ratio in each slot of concentric winding per phase respectively, the waveform of the air-gap magnetic field becomes closer to a sinusoidal type. Three motors equipped with the CSDLSD winding and another two types of stator winding were analyzed. The theoretical analysis and the two-dimensional finite element method (2D-FEM) were combined to study the relationship between the harmonics of the air-gap magnetic field and the stator winding. Finally, a 2D fast Fourier transformation (2D-FFT) method was used to obtain the time-frequency spectrum of the air-gap flux density and electromagnetic excitation force, and compared with a natural vibration wave. The noise distribution was obtained using the harmonic response. The results of the theoretical analysis, 2D-FEM, 2D-FFT, and harmonic response corroborate each other such that the motor applying CSDLSD winding could reduce both the vibration and noise. 参考文献 | 相关文章 | 多维度评价

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29. PSO-based Optimization for Constant-current Charging Pattern for Li-ion Battery* Yixiao Wang, Yong Li, Li Jiang, Yuduo Huang, Yijia Cao 中国电气工程学报（英文）    2019, 5 (2): 72-78.   摘要 （182）      PDF    可视化    收藏 A particle swarm optimization algorithm to search for an optimal five-stage constant-current charge pattern is proposed. The goal is to maximize the objective function for the proposed charge pattern based on the charging capacity, time, and energy efficiency, which all share the same weight. Firstly, an equivalent circuit model is built and battery parameters are identified. Then the optimal five-stage constant-current charge pattern is searched using a particle swarm optimization algorithm. At last, comparative experiments using the constant current-constant voltage (CC-CV) method are performed. Although the charging SOC of the proposed charging pattern was 2.5% lower than that of the CC-CV strategy, the charging time and charging energy efficiency are improved by 15.6% and 0.47% respectively. In particular, the maximum temperature increase of the battery is approximately 0.8 ℃ lower than that of the CC-CV method, which indicates that the proposed charging pattern is more secure. 参考文献 | 相关文章 | 多维度评价

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30. High-Voltage-Gain DC-DC Converter with Three-Winding Coupled Inductor* Wenjuan Liang, Xuefeng Hu, Hao Chen, Guiyang Wu, Meng Zhang, Guodong Tan 中国电气工程学报（英文）    2019, 5 (1): 11-23.   摘要 （234）      PDF    可视化    收藏 A novel DC-DC converter topology that uses a three-winding coupled inductor (TWCI) and a new voltage- multiplication technique is presented for achieving high voltage gain. The proposed converter comprises one boost unit, one passive absorption circuit, and two voltage-multiplier cells. The tertiary winding of the coupled inductor is connected to a capacitor and diode, and this combination acts as a secondary voltage-multiplier cell (SVMC). The SVMC, when combined with two capacitors, the secondary winding of the coupled inductor, a diode, and a switch, forms a primary voltage-multiplier cell, which can achieve a large voltage-conversion ratio that can be adjusted easily. The new voltage-multiplier technique can be used to decrease the number of capacitors and diodes, which improves the transformation efficiency. A prototype circuit with a nominal rating of 300 W is designed to verify the correctness of theoretical analysis. 参考文献 | 相关文章 | 多维度评价

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31. Enhancing Energy Utilization Efficiency of Pakistani System Considering FACTS Devices and Distributed Generation: Feasibility Study* Ghamgeen Izat Rashed, Hussain Haider, M.B. Shafik 中国电气工程学报（英文）    2020, 6 (2): 66-82.   DOI: 10.23919/CJEE.2020.000012 摘要 （273）      PDF    可视化    收藏 In recent years, voltage stability issues have become a serious concern with regard to the safety of electrical systems, these issues are more evident and have wider consequences in vertical networks with an insufficient reactive power reserve. Pakistan is currently suffering from the worst energy crisis in its history. Owing to an increase in energy demand, the current transmission system is becoming increasingly inadequate. It has thus become necessary to reduce losses and enhance the system voltage profile for more efficient energy utilization. In this study, the main emphasis is on assessing the feasibility of using flexible AC transmission system devices and distributed generation to compensate power failures on the power lines of the Pakistani power transmission system. The load flow and contingency analyses are performed on a 132 kV transmission system that feeds power to the Quetta electric supply company. The region of Baluchistan is studied to evaluate the effectiveness of the proposed method. The system is simulated using NEPLAN, which accurately models the details of all system elements and the optimal power flow. The simulation results indicate that the proposed method helps reduce system losses, voltage deviation, and power flow congestion, with all system constraints within permissible limits. 参考文献 | 相关文章 | 多维度评价

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32. Reduction of High-frequency Vibration Noise for Dual-branch Three-phase Permanent Magnet Synchronous Motors* Wentao Zhang, Yongxiang Xu, Yingliang Huang, Jibin Zou 中国电气工程学报（英文）    2020, 6 (2): 42-51.   DOI: 10.23919/CJEE.2020.000010 摘要 （310）      PDF    可视化    收藏 Two-level voltage source inverters with pulse width modulation (PWM) generate multiple carrier harmonics, thereby exciting high-frequency noise from the motor. Based on a special dual-branch three-phase permanent magnet synchronous motor (PMSM), a method that utilizes a known modified space vector PWM technique is proposed. This method is able to suppress unpleasant high-frequency vibration noise as well as acoustic noise more effectively than other methods. Vibration noise near the twice carrier frequency is eliminated, and PWM vibration noise around the carrier frequency is also reduced. In particular, vibration and acoustic noise at the twice carrier frequency are eliminated using a carrier phase-shift of 0.5π and the special winding structure of the dual-branch PMSM. The effectiveness of the proposed method is confirmed using detailed experimental results. 参考文献 | 相关文章 | 多维度评价

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33. Active Power Reserve Photovoltaic Virtual Synchronization Control Technology* Xing Zhang, Qian Gao, Yuhua Hu, Haizheng Zhang, Zixuan Guo 中国电气工程学报（英文）    2020, 6 (2): 1-6.   DOI: 10.23919/CJEE.2020.000006 摘要 （468）      PDF    可视化    收藏 The photovoltaic virtual synchronous generator (PV-VSG) solves the problem of lack of inertia in the PV power-generation system. The existing PV plants without energy storage are required to participate in the power grid's frequency modulation (FM), but existing PV-VSGs with energy storage have high requirements for coordinated control. Therefore, the active power reserve PV-VSG (APR-PV-VSG) is studied. Based on the different methods to obtain the maximum power point (MPP), the peer-to-peer and master-slave APR-PV-VSG strategies are proposed. The PV inverters are deviated from the MPP to reserve active power, which is used as the virtual inertia and primary FM power. These methods equip the PV power station with FM capability. The effectiveness of the proposed control strategies is verified by simulation results. 参考文献 | 相关文章 | 多维度评价

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34. Stability-improvement Method of Cascaded DC-DC Converters with Additional Voltage-error Mutual Feedback Control* Zhongya Guo, Hong Li, Chen Liu, Yangyang Zhao, Wenzhe Su 中国电气工程学报（英文）    2019, 5 (2): 63-71.   摘要 （178）      PDF    可视化    收藏 The interaction between the source and load converters in cascaded DC-DC converters may cause instability. Thus, improving the stability of cascaded DC-DC converters is important. To solve the above-mentioned problem, a flowchart to improve the control method is established by calculating the eigenvalue sensitivity of a time-domain model of cascaded DC-DC converters. Further, an additional voltage-error mutual feedback control method is firstly proposed based on the flowchart provided in this study to improve the stability of cascaded DC-DC converters. Subsequently, the influence of the proposed mutual feedback control on the stability of cascaded DC-DC converters is analyzed. Finally, the effectiveness of the proposed control method is verified by simulation and experiment. 参考文献 | 相关文章 | 多维度评价

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35. Benefits of High-voltage SiC-based Power Electronics in Medium-voltage Power-distribution Grids* Fred Wang, Shiqi Ji 中国电气工程学报（英文）    2021, 7 (1): 1-26.   DOI: 10.23919/CJEE.2021.000001 摘要 （457）      PDF    可视化    收藏 Medium-voltage (MV) power electronics equipment has been increasingly applied in distribution grids, and high-voltage (HV) silicon carbide (SiC) power semiconductors have attracted considerable attention in recent years. This paper first overviews the development and status of HV SiC power semiconductors. Then, MV power-converter applications in distribution grids are summarized and the benefits of HV SiC in these applications are presented. Microgrids, including conventional and asynchronous microgrids, that can fully demonstrate the benefits of HV SiC power semiconductors are selected to investigate the benefits of HV SiC in detail, including converter-level benefits and system-level benefits. Finally, an asynchronous microgrid power-conditioning system (PCS) prototype using a 10 kV SiC MOSFET is presented. 参考文献 | 相关文章 | 多维度评价

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36. Robust Predictive Current Control of Induction Motors Based on Linear Extended State Observer Yongchang Zhang, Xing Wang, Haitao Yang, Boyue Zhang and Jose Rodriguez 中国电气工程学报（英文）    2021, 7 (1): 94-105.   DOI: 10.23919/CJEE.2021.000009 摘要 （380）      PDF    可视化    收藏 Model predictive current control can achieve fast dynamic response and satisfactory steady-state performance for induction motor (IM) drives. However, many motor parameters are required to implement the control algorithm. Consequently, if the motor parameters used in the controller are not accurate, the performance may deteriorate. In this paper, a new robust predictive current control is proposed to improve robustness against parameter mismatches. The proposed method employs an ultra-local model to replace the mathematical model of the IM. Additionally, to improve the control performance, a linear extended state observer is developed for disturbance estimation. Experimental tests confirm that satisfactory tracking performance can still be obtained although the motor parameters may not be accurately set in the controller. 参考文献 | 相关文章 | 多维度评价

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37. Review of Low Carrier Ratio Converter System* Mai Xu, Yang Zhang, Da Luo, Anping Shen 中国电气工程学报（英文）    2021, 7 (1): 79-93.   DOI: 10.23919/CJEE.2021.000008 摘要 （409）      PDF    可视化    收藏 With the rapid development of new energy power generation and high-power traction technology, the voltage and power levels of converter devices have been continuously improved, and the application of high-power converters is becoming increasingly widespread. However, high-power converters are affected by switching losses and heat dissipation, meaning they are not suitable for high carrier conditions. Therefore, research of low carrier ratio converter systems has received increased attention. Based on existing research, the problems of large current harmonics, low observation accuracy, and poor stability that may occur at low carrier ratios are explained. In addition, the topologies, modulation strategies, and control methods of the low carrier ratio converter system are analyzed and classified. Finally, future research directions of low carrier ratio converter systems are proposed. 参考文献 | 相关文章 | 多维度评价

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38. Review of Parameter Identification and Sensorless Control Methods for Synchronous Reluctance Machines* Chengrui Li, Gaolin Wang, Guoqiang Zhang, Nannan Zhao, Dianguo Xu 中国电气工程学报（英文）    2020, 6 (2): 7-18.   DOI: 10.23919/CJEE.2020.000007 摘要 （553）      PDF    可视化    收藏 Synchronous reluctance machines (SynRMs) have drawn increasing attention in recent years owing to their advantages such as low cost, simple structure, ease of manufacture, and high robustness. The main obstacle to the promotion of SynRMs is severe parameter nonlinearity, which deteriorates drive performance. Sensorless control methods for SynRMs are critical technologies that can broaden the industrial applications of SynRMs. Various methods of parameter identification and sensorless control strategies are reviewed and discussed, including self-commissioning, which is analyzed in detail. Furthermore, sensorless control strategies that can improve the industrial application of SynRMs are described. Finally, future research trends concerning SynRMs are analyzed and discussed. 参考文献 | 相关文章 | 多维度评价

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39. Modified PI Controller with Improved Steady-State Performance and Comparison with PR Controller on Direct Matrix Converters Jianwei Zhang, Li Li, David G. Dorrell, Youguang Guo 中国电气工程学报（英文）    2019, 5 (1): 53-66.   摘要 （200）      PDF    可视化    收藏 This paper proposes a modified proportional-integral (PI) controller and compares it with a proportional-resonant (PR) controller. These controllers are tested on a three-phase direct matrix converter (MC). The modified PI controller involves current feedforward together with space vector modulation (SVM) to control the MC output currents. This controller provides extra control flexibility in terms of the current error reduction, and it gives improved steady-state tracking performance. When the coefficient of current feedforward is equal to the load resistor (K = R), the steady-state error is effectively minimized even when regulating sinusoidal variables. The total harmonic distortion is also reduced. In order to comparatively evaluate the modified PI controller, a PR controller is designed and tested. Both the modified PI and PR controllers are implemented in the natural frame (abc) in a straightforward manner. This removes the coordinate transformations that are required in the stationary (αβ) and synchronous (dq) reference frame based control strategies. In addition, both controllers can handle the unbalanced conditions. The experimental and simulation results verify the feasibility and effectiveness of the proposed controllers. 参考文献 | 相关文章 | 多维度评价

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40. Capacity Configuration of Hybrid CSP/PV Plant for Economical Application of Solar Energy* Fei Li, Canbing Li, Kai Sun, Jiamei Zhang, Hua Li 中国电气工程学报（英文）    2020, 6 (2): 19-29.   DOI: 10.23919/CJEE.2020.000008 摘要 （284）      PDF    可视化    收藏 Concentrating solar power (CSP) technology has received increasing attention in recent years because of its distinct advantage for dispatchable power generation from solar energy. However, owing to its highly levelized costs of electricity, CSP plants are less competitive than photovoltaic (PV) power plants. To overcome this drawback and suppress PV power fluctuations, the concept of a hybrid CSP/PV power plant is proposed and developed. A capacity configuration method based on filtering and checking is proposed to seek a relationship between the capacity configuration of a hybrid CSP/PV system and the cost of solar energy. Co-content hybrid systems with different ratios of CSP capacity and PV capacity are modeled, and their comprehensive performance is investigated. Simulations and comparisons with a standalone CSP system focused on annual energy generation, capacity factor, levelized cost of electricity, and possibility for loss of power supply show that the hybrid CSP/PV systems possess different features depending on their capacity configurations. The results indicate that the proposed method can supply a convenient and simple operation pattern that favors engineering utilization and extension. 参考文献 | 相关文章 | 多维度评价