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    Special Issue on Electromagnetic Interference and Electromagnetic Compatibility in Power Electronics System-Part 1

    Guest Editors：Shuo Wang  (University of Florida, USA)    

    Stephan Frei  (TU Dortmund University, Germany)

    Hong Li (Beijing Jiaotong University, China)


    With the development of high and new technologies such as 5G, big data, high-speed railway, renewable energy generation, flexible AC/DC transmission and electric vehicles, the power conversion system as the key support function is also developing rapidly in the direction of high frequency, high efficiency, high power and high-power density. The electromagnetic environment of the power and energy conversion system becomes more and more complex, which puts forward more stringent requirements for the electromagnetic compatibility design of the system, especially with the technological breakthrough and commercial use of wide band gap semiconductor power devices represented by SiC and GaN. Electromagnetic interference (EMI) and electromagnetic compatibility (EMC) have become the important challenges to ensure the functionality, safety, reliability and performance of the system. Therefore, it is of great significance to study the EMI and EMC theory and key technologies of power electronics system.
    At present, EMI prediction and EMC technology of power electronics system have been widely studied. However, different industries have different technical characteristics and needs. Further, there are new challenges for satisfying EMC standard of power electronics system under the new situations such as the use of wide-band gap power switches, higher switching frequency, higher integration, higher voltage and higher power. Thus, it is necessary to carry out in-depth scientific research on the basic theory and key technologies of EMI and EMC of power electronics system.

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    Editorial for Special Issue on Electromagnetic Interference and Electromagnetic Compatibility in Power Electronics System
    Shuo Wang, Stephan Frei, Hong Li
    Chinese Journal of Electrical Engineering    2022, 8 (3): 1-1.   DOI: 10.23919/CJEE.2022.000020
    Abstract （219）      PDF      
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    Research and Modeling on the Characteristic Changes of EMI Filter Passive Components under the Influence of Aging*
    Wenzhe Su, Hong Li, Zhichang Yang, Baihua Zhang
    Chinese Journal of Electrical Engineering    2022, 8 (3): 2-11.   DOI: 10.23919/CJEE.2022.000021
    Abstract （275）      PDF      
    At present, the power density of power electronic devices in data centers and electric vehicles is constantly increasing, and numerous electronic components are concentrated in a tight, high-temperature environment, which aggravates the performance degradation of electronic components. Consequently, X and Y capacitors, common-mode inductors, and differential-mode inductors used for electromagnetic interference (EMI) suppression suffer from aging effects, and their performance continues to decline. However, the electromagnetic compatibility test is often conducted immediately after the power electronic equipment leaves the factory. The electromagnetic compatibility of power electronic equipment is affected by aging, which is not assessed in current industrial testing. This study conducts aging experiments on passive electronic components in EMI filters and measures the impedance in the frequency range from 150 kHz to 30 MHz. Subsequently, a multi-element aging model based on electromagnetic field analysis is established. The proposed model is suitable for electromagnetic compatibility analysis considering aging. Finally, the aging performance of a commercial two-stage EMI filter is predicted to verify the model proposed in the study. The proposed model explains the degeneration of the EMI filter with aging in the frequency range of 150 kHz to 1 MHz, with a maximum amplitude error of 0.58 dB and phase error of 1.0°.
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    Impact of Motor Stator Winding Faults on Motor Differential-mode Impedance and Mode Transformation
    Fei Fan, Zhenyu Zhao, Huamin Jie, Quqin Sun, Pengfei Tu, Zhou Shu, Wensong Wang, Kye Yak See
    Chinese Journal of Electrical Engineering    2022, 8 (3): 12-21.   DOI: 10.23919/CJEE.2022.000022
    Abstract （238）      PDF      
    Motor impedance and mode transformation have significant effects on the electromagnetic interference (EMI) generated in motor drive systems. Stator winding faults commonly cause motor failure; however, in their early stages, they may not affect the short-term operation of the motor. To date, EMI noise under the influence of premature stator winding faults has not been adequately studied, particularly the differential-mode (DM) noise due to the common-mode (CM)-to-DM transformation. This study investigates and quantifies the influence of stator winding faults on the motor DM impedance and mode transformation. First, the transmission line model of an induction motor is described based on the scattering (S) parameter measurements of each phase of the motor. It offers the flexibility to emulate different types of stator winding faults at specific locations and various severities, such that the impacts of the faults on the motor DM impedance can be easily estimated. Second, a test setup is proposed to quantify the CM-to-DM transformation due to the stator winding faults. The findings of this study reveal that even the early stages of stator winding faults can result in significant changes in the DM noise.
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    Common-mode Electromagnetic Interference Mitigation for Solid-state Transformers
    Dong Jiang, Zhenyu Wang, Wenjie Chen, Jianrui Liu, Xuan Zhao, Wei Sun
    Chinese Journal of Electrical Engineering    2022, 8 (3): 22-36.   DOI: 10.23919/CJEE.2022.000023
    Abstract （238）      PDF      
    Solid-state transformers (SSTs) have been widely used in many areas owing to their advantages of high-frequency isolation and high power density. However, high-frequency switching causes severe electromagnetic interference (EMI) problems. Particularly, the common-mode (CM) EMI caused by the switching of the dual active bridge (DAB) converter is conducted through the parasitic capacitances in the high-frequency transformer and impacts the system reliability. With the understanding of the CM EMI model in SSTs, CM EMI mitigation methods have been studied. For passive mitigation, the coupled inductor can be integrated with the phase-shift inductor function to reduce CM EMI. For active mitigation, variations in the DAB switching frequency can help reduce the CM EMI peak. An active EMI filter can also be designed to sample and compensate for CM EMI. Using these methods, CM EMI can be reduced in SSTs.
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    Electromagnetic Radiation Mechanism Analysis and Field Strength Prediction of an Elementary Digital Inverter with Cables*
    Junping He, Xin Li, Sili Tao, Lingling Cao, Xi Wang
    Chinese Journal of Electrical Engineering    2022, 8 (3): 37-48.   DOI: 10.23919/CJEE.2022.000024
    Abstract （221）      PDF      
    In this paper, common mode (CM) and differential mode (DM) far-field radiation models of a typical digital inverter with cables are built up to predict electromagnetic field strength and analyze field characteristics. The CM current model and its analyses are based on the imbalance difference method. It is found out that the voltage between the drain and the source electrodes of upper transistor is the key equivalent source of electromagnetic interference (EMI). Far-field radiation strength of the digital inverter in free space is predicted by using the asymmetrical antenna radiation method and current loop radiation method. The accuracy of these methods is verified by the CST electromagnetic simulation results in the frequency range from 1 MHz to 400 MHz. Furthermore, the radiation models are improved by using the mirror method, which enables to include the reflection effect of the metal ground plane at the electromagnetic compatibility (EMC) test site. Both the results of measurements in a semi-anechoic chamber and the simulation results confirm the proposed electromagnetic radiation prediction method.
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    Planar Magnetic Integrated Harmonic Filter with Reduced EMI Noise*
    Zijian Lu, Tianhao Chen, Yitao Liu
    Chinese Journal of Electrical Engineering    2022, 8 (3): 49-56.   DOI: 10.23919/CJEE.2022.000025
    Abstract （184）      PDF      
    Through the analysis of the circuit structure and electromagnetic interference (EMI) conduction path, the structure of the traditional harmonic filter is optimized so that it has the ability to suppress EMI. Using the structure of planar magnetic integration not only ensures the basic harmonic suppression ability of the harmonic filter, but also improves the EMI suppression effect. With a single-phase voltage source 500-W SiC inverter as the platform, the feasibility and effectiveness of the design scheme are experimentally verified. The results indicated that the planar magnetic integrated harmonic EMI filter satisfies the design requirements. Additionally, the proposed planar magnetic integration scheme can significantly reduce the volume and weight of the filter and increase the power density of the entire system.
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