A Power Allocation Method for Grid-Connected MMC Inverter Based on Droop Control

Chinese Journal of Electrical Engineering ›› 2016, Vol. 2 ›› Issue (2): 84-91.

A Power Allocation Method for Grid-Connected MMC Inverter Based on Droop Control

Fei Rong, Zhangtao Yin, Zhikang Shuai^*, Shoudao Huang

College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China

Online:2016-12-25 Published:2019-11-01
Contact: E-mail:53293289@qq.com.
About author:Fei Rong was born in Hubei, China, in 1978. He received the B.S. and M.S. degrees from Central South University, Changsha, China, in 2000 and 2003, respectively. He also received Ph.D. degree from Hunan University, Changsha, China, in 2008.He was a lecture from 2008 to 2010, and since 2011, has been an Associate Professor of electrical engineering in the College of Electrical and information engineering, Hunan University. His interests include distributed power generation, reactive power compensation and active power filters. Zhangtao Yin was born in Hubei, China, in 1993. He received the B.S. degree in electrical engineering from HeFei University of Technology, Anhui, China, in 2016. Since 2016, he has been working toward the M.S. degree in the College of Electrical and information engineering, Hunan University, Changsha, China. His research interests include modular multilevel converter, distributed power generation and reactive power compensation. Zhikang Shuai was born in Shandong, China, in 1982. He received the B.S. and Ph.D. degrees from the College of Electrical and Information Engineering, Hunan University, Changsha, China, in 2005 and 2011, respectively, both in electrical engineering. He was with Hunan University as an Assistant Professor from 2009 to 2012, an Associate Professor in 2013, and has been a Professor since 2014. His current research interests include power quality control, power electronics, and microgrid stability. Shoudao Huang was born in Hunan, China, in 1962. He received the B.S. degree and Ph.D. degrees from Hunan University, Changsha, China, in 1981 and 2005, respectively. From 2008 to 2009, he was a visit scholar in Aalborg Universitet, Danmark. Since 2006, he has been an professor of electrical engineering in the College of Electrical and information engineering, Hunan University. Since 2013, he has been an IEEE member. His interests include distributed power generation, motor driver and control.
Supported by:
Supported by the National Key Research and Development Plan of China under Grant 2016YFB0901001.

Abstract

Abstract: Droop control has been widely used for controlling distributed generators. As capacity of the MMC inverter may be insufficient, a power allocation method for grid-connected MMC inverter based on droop control is presented to improve the stability of the power system. As there is potential for large disturbances in the power grid, an equal speed regulation strategy is adopted to make the speed of the voltage collapse be the same as the frequency collapse. With obtaining the active and reactive power references of MMC inverter according to equal speed regulation strategy, the deadbeat control method is calculated using these power references and adopted to track the reference currents. The Routh criterion is used to analyze the influence of the inductance measurement error on the control system. Additionally, a simulation model is established with Matlab and Simulink. The simulation results show that the stability of the power grid has been improved with the proposed control method.

Key words: MMC, droop control, power allocation, equal speed regulation, deadbeat control. References

Fei Rong, Zhangtao Yin, Zhikang Shuai, Shoudao Huang. A Power Allocation Method for Grid-Connected MMC Inverter Based on Droop Control[J]. Chinese Journal of Electrical Engineering, 2016, 2(2): 84-91.

References

[1] Hassan Bevrani, Shoresh Shokoohi, “An intelligent droop control for simultaneous voltage and frequency regulation in islanded microgrids,” IEEE Trans. Smart Grid, vol.4, no.3, pp.1505-1513, 2013.
[2] Jef Beerten, Ronnie Belmans, “Analysis of power sharing and voltage deviations in droop-controlled DC grids, ” IEEE Trans. Power Sys., vol.28, no.4, pp.4588-4597, 2013.
[3] Yuko Omagari, Tsuyoshi Funaki, “Numerical study of transient stability criteria for an inverter-based distributed generator, ” 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems, Aalborg, Denmark, pp.865-871, Jun.2012.
[4] Qobad Shafiee, Josep M. Guerrero, Juan C. Vasquez, “Distributed secondary control for islanded microgrids—a novel approach, ” IEEE Trans. Power Electronics, vol.29, no.2, pp.1018-1031, 2014.
[5] Juan C. Vasquez, Josep M. Guerrero, Mehdi Savaghebi, et al, “Modeling, analysis, and design of stationary-reference-frame droop-controlled parallel three-phase voltage source inverters, ” IEEE Trans. Industrial Electronics, vol.60, no.4, pp.1271- 1280, 2013.
[6] Andrew D. Paquette, Deepak M. Divan, “Virtual impedance current limiting for inverters in microgrids with synchronous generators, ” IEEE Trans. Industry Applications, vol.51, no.2, pp.1630-1638, 2015.
[7] Huanhai Xin, Linbin Huang, Leiqi Zhang, et al, “Synchronous instability mechanism of P-f droop-controlled voltage source converter caused by current saturation, ” IEEE Trans. Power Systems, vol.31, no.6, pp.5206-5207, 2016.
[8] Nilanjan Ray Chaudhuri, Balarko Chaudhuri, “Adaptive droop control for effective power sharing in multi-terminal DC(MTDC) grids, ” IEEE Trans Power Systems, vol.28, no.1. pp.21-29, 2013.
[9] Mohamed A. Abdelwahed, Ehab F. El-Saadany, “Power sharing control strategy of multi-terminal VSC-HVDC transmission systems utilizing adaptive voltage droop,” IEEE Trans. Sustainable Energy, early access(DOI 10.1109/TSTE.2016. 2614223).
[10] Liang Xiao, Zheng Xu, Ting An, et al, “Improved analytical model for the study of steady state performance of droopcontrolled VSC-MTDC systems,” IEEE Trans. Power System, early access( DOI 10.1109/TPWRS.2016.2601104).
[11] Adam Milczarek, Mariusz Malinowski, Josep M. Guerrero, “Reactive power management in islanded microgridproportional power sharing in hierarchical droop control,” IEEE Trans. Smart Grid, vol.6, no.4, pp.1631-1638, 2015.
[12] Hongpeng Liu, Poh Chiang Loh, Xiongfei Wang, et al, “Droop control with improved disturbance adaption for a PV system with two power conversion stages,” IEEE Trans. Industrial Electronics, vol.63, no.10, pp.6073-6085, 2016.
[13] Augustine M. Egwebe , Meghdad Fazeli , Petar Igic , et al. 'Implementation and stability study of dynamic droop in islanded microgrids,” IEEE Trans. Energy Conversion, vol.31, no.3, pp.821-832, 2016.
[14] John W. Simpson-Porco, Florian D¨orfler, Francesco Bullo, “Voltage stabilization in microgrids via quadratic droop control,” IEEE Trans. Automatic Control, early access(DOI 10.1109 /TAC.2016.2585094).
[15] Yuebin Zhou, Daozhuo Jiang, Pengfei Hu, et al, “A prototype of modular multilevel converters,” IEEE Trans. Power Electronics, vol.29, no.7, pp.3267-3278, 2014.