Droop Control Method Based on Dynamic Virtual ComplexImpedance for Microgrid

doi:10.11985/2020.01.007

Abstract

Abstract:

Output power sharing and circulating current suppression have been the main subjects for parallel inverters. The equivalent output impedance of the inverters is designed to be resistive using dynamic virtual complex impedance, which can improve applicability of selected PV-QF droop control and decouple the active power and reactive power. The dynamic virtual complex impedance method is proposed to further suppress the circulating current and improve performance of the power sharing and dynamic response after analyzing the generation and influencing factors of the circulating current. The feasibility of the proposed method is verified by the simulation.

Key words: Inverters in parallel operation, droop control, dynamic virtual complex impedance, circulating current suppression, power sharing

CLC Number:

TM464

FAN Bishuang,WEI Guoqiang,LI Zeyang,YAO Ganzhou. Droop Control Method Based on Dynamic Virtual ComplexImpedance for Microgrid[J]. Journal of Electrical Engineering, 2020, 15(1): 48-54.

Figures/Tables 15

References 22

[1]	Van der Meer D, Mouli G R C, Morales-Espana G , et al. Energy management system with PV power forecast to optimally charge EVs at the workplace[J]. IEEE Transactions on Industrial Informatics, 2016,14(1):311-320. doi: 10.1109/TII.2016.2634624
[2]	Eid B M, Rahim N A, Selvaraj J , et al. Control methods and objectives for electronically coupled distributed energy resources in microgrids:A review[J]. IEEE System Journal, 2016,10(2):446-458. doi: 10.1109/JSYST.2013.2296075
[3]	Guo Li, Zhang Shaohui, Li Xialin , et al. Stability analysis and damping enhancement based on frequency-dependent virtual impedance for DC microgrids[J]. IEEE Journal of Emerging & Selected Topics in Power Electronics, 2017,5(1):338-350.
[4]	Yang Jie, Jin Xinmin, Wu Xuezhi , et al. Decentralized control method for DC microgrids with improved current sharing accuracy[J]. IET Generation Transmission & Distribution, 2017,11(3):696-706.
[5]	陈燕东, 罗安, 龙际根 , 等. 阻性逆变器并联环流分析及鲁棒下垂多环控制[J]. 中国电机工程学报, 2013,33(18):18-29.
	Chen Yandong, Luo An, Long Jigen , et al. Circulating current analysis and robust droop multiple loop control method for parallel inverters using resistive output impedance[J]. Proceedings of the CSEE, 2013,33(18):18-29.
[6]	Xiao Huagen, Luo A, Shuai Zhikang , et al. An improved control method for multiple bidirectional power converters in hybrid AC/DC microgrid[J]. IEEE Transactions on Smart Grid, 2016,7(1):340-347. doi: 10.1109/TSG.2015.2469758
[7]	张庆海, 彭楚武, 陈燕东 , 等. 一种微电网多逆变器并联运行控制策略[J]. 中国电机工程学报, 2012,32(25):126-132.
	Zhang Qinghai, Peng Chuwu, Chen Yandong , et al. Control strategy for parallel operation of multi-inverters in microgrid[J]. Proceedings of the CSEE, 2012,32(25):126-132.
[8]	Hu Jiefeng, Zhu Jianguo, David G , et al. Virtual flux droop method:A new control strategy of inverters in microgrids[J]. IEEE Transactions on Power Electronics, 2014,29(9):4704-4711. doi: 10.1109/TPEL.2013.2286159
[9]	顾和荣, 赵巍, 王雷 , 等. 微电网逆变器电流下垂控制分析与实验研究[J]. 电力系统保护与控制, 2013,41(18):45-48. doi: 10.7667/j.issn.1674-3415.2013.18.007
	Gu Herong, Zhao Wei, Wang Lei , et al. Analysis and experimental verification of current droop control for microgrid inverters[J]. Power System Protection and Control, 2013,41(18):45-48. doi: 10.7667/j.issn.1674-3415.2013.18.007
[10]	刘建华, 杨洪耕, 张洁 , 等. 基于等效参考电流控制的低压微电网控制策略[J]. 电网技术, 2015,39(4):932-938. doi: 10.13335/j.1000-3673.pst.2015.04.009
	Liu Jianhua, Yang Honggeng, Zhang Jie , et al. An equivalent reference current based control strategy for low voltage microgrid[J]. Power System Technology, 2015,39(4):932-938. doi: 10.13335/j.1000-3673.pst.2015.04.009
[11]	姚骏, 杜红彪, 周特 , 等. 微网逆变器并联运行的改进下垂控制策略[J]. 电网技术, 2014,38(6):1529-1535. doi: 10.13335/j.1000-3673.pst.2014.06.017
	Yao Jun, Du Hongbiao, Zhou Te , et al. Improved droop control strategy for inverters parallel operation in microgrid[J]. Power System Technology, 2014,38(6):1529-1535. doi: 10.13335/j.1000-3673.pst.2014.06.017
[12]	赵巧娥, 张乐乐, 武晓冬 , 等. 基于并联虚拟电阻的多逆变器控制策略[J]. 电力系统保护与控制, 2017,45(15):30-39.
	Zhao Qiaoe, Zhang Lele, Wu Xiaodong , et al. Control strategy for multi-inverters based on parallel virtual resistance[J]. Power System Protection and Control, 2017,45(15):30-39.
[13]	张平, 石健将, 李荣贵 , 等. 低压微网逆变器的“虚拟负阻抗”控制策略[J]. 中国电机工程学报, 2014,34(12):1844-1852. doi: 10.13334/j.0258-8013.pcsee.2014.12.003
	Zhang Ping, Shi Jianjiang, Li Ronggui , et al. A control strategy of ‘virtual negative’ impedance for inverters in low-voltage microgrid[J]. Proceedings of the CSEE, 2014,34(12):1844-1852. doi: 10.13334/j.0258-8013.pcsee.2014.12.003
[14]	吕志鹏, 刘海涛, 苏剑 , 等. 可改善微网电压调整的容性等效输出阻抗逆变器[J]. 中国电机工程学报, 2013,33(9):1-9.
	Lü Zhipeng, Liu Haitao, Su Jian , et al. Micro-source inverters with capacitive equivalent output impendence for improving microgrid voltages[J]. Proceedings of the CSEE, 2013,33(9):1-9.
[15]	He Jinwei, Li Yunwei, Guerrero J M , et al. An islanding power sharing approach using enhanced virtual impedance control scheme[J]. IEEE Transactions on Power Electronics, 2013,28(11):5272-5282. doi: 10.1109/TPEL.2013.2243757
[16]	Mahmood H, Michaelson D, Jiang Jin . Accurate reactive power sharing in an islanded microgrid using adaptive virtual impedances[J]. IEEE Transactions on Power Electronics, 2015,30(3):1605-1617. doi: 10.1109/TPEL.2014.2314721
[17]	李浩然, 杨旭红, 冯成臣 , 等. 多逆变器并联下的输出阻抗分析和改进下垂控制策略[J]. 电力系统保护与控制, 2015,43(20):29-35. doi: 10.7667/j.issn.1674-3415.2015.20.005
	Li Haoran, Yang Xuhong, Feng Chengchen , et al. Control strategy research of output impedance analysis and improved droop control based on multiple-inverters parallel[J]. Power System Protection and Control, 2015,43(20):29-35. doi: 10.7667/j.issn.1674-3415.2015.20.005
[18]	梁海峰, 郑灿, 高亚静 , 等. 微网改进下垂控制策略研究[J]. 中国电机工程学报, 2017,37(17):4901-4910.
	Liang Haifeng, Zheng Can, Gao Yajing , et al. Research on improved droop control strategy for microgrid[J]. Proceedings of the CSEE, 2017,37(17):4901-4910.
[19]	刘尧, 林超, 陈滔 , 等. 基于自适应虚拟阻抗的交流微电网无功功率-电压控制策略[J]. 电力系统自动化, 2017,41(5):16-21.
	Liu Yao, Lin Chao, Chen Tao , et al. Reactive power- voltage control strategy of AC microgrid based on adaptive virtual impedance[J]. Automation of Electric Power Systems, 2017,41(5):16-21.
[20]	荆龙, 黄杏, 吴学智 , 等. 改进型微源下垂控制策略研究[J]. 电工技术学报, 2014,29(2):145-153.
	Jing Long, Huang Xing, Wu Xuezhi , et al. Research on improved microsource droop control method[J]. Transactions of China Electrotechnical Society, 2014,29(2):145-153.
[21]	邢作霞, 芦彦东, 董焕宝 . 基于虚拟阻抗的变阻感比低压微电网功率控制策略研究[J]. 电气工程学报, 2018,13(5):14-20. doi: 10.11985/2018.05.003
	Xing Zuoxia, Lu Yandong, Dong Huanbao . Power decoupling control strategy of variable impedance ratio based on virtual impedance for microgrid[J]. Journal of Electrical Engineering, 2018,13(5):14-20. doi: 10.11985/2018.05.003
[22]	陈薇, 赵强 . 基于虚拟阻抗的逆变器并联控制策略的研究[J]. 电气工程学报, 2018,13(8):7-13.
	Chen Wei, Zhao Qiang . An inverter parallel control strategy research based on virtual impedance[J]. Journal of Electrical Engineering, 2018,13(8):7-13.