Abstract：Aiming at the resonance problem of inverter parallel system in islanding mode,the single inverter system equivalent model by considering the influence of nonlinear factors such as digital control delay and digital filters etc.was established.Furthermore,an islanding multi parallel inverter system equivalent model was achieved by extending the single equivalent model.In addition,the resonant characteristics of the parallel inverter system were further analyzed by using the equivalent admittance of islanding multi inverter parallel system.The analytical results show that the multi harmonic interaction between the inverters may cause system resonance.As a conclusion,the resonant characteristics of the system were influenced by the virtual impedances,loads and feedback filters etc.Finally,a novel strategy by carefully selecting the virtual impedance and introducing a series feedback filter in current feedback loop was proposed to suppress the system resonance.Experimental results are used to verify the correctness of islanding mode multi inverter parallel system equivalent model,and the feasibility of proposed resonant characteristics analysis method,suppression strategy are also verified by the experimental results.
姚 骏, 谭 义, 杜红彪 ,郭利莎 ,曾 欣. 孤岛模式下逆变器并联系统的谐振特性分析及其抑制策略研究[J]. 电工技术学报, 2016, 31(23): 199-210.
Yao Jun, Tan Yi, Du Hongbiao, Guo Lisha, Zeng Xin. Analysis of Resonant Characteristics and Resonance Suppression Strategy of Inverter Parallel System in Islanding Mode. Transactions of China Electrotechnical Society, 2016, 31(23): 199-210.
[1] 贝太周,王萍,蔡蒙蒙.注入三次谐波扰动的分布式光伏并网逆变器孤岛检测技术[J].电工技术学报,2015,30(7):44-51. Bei Taizhou,Wang Ping,Cai Mengmeng.An islanding detection method with the third harmonic injection for distributed grid-connected PV inverters[J].Transactions of China Electrotechnical Society,2015,30(7):44-51. [2] 王成山,武震,李鹏.微电网关键技术研究[J].电工技术学报,2014,29(2):1-12. Wang Chengshan,Wu Zhen,Li Peng.Research on key technologies of microgrid[J].Transactions of China Electrotechnical Society,2014,29(2):1-12. [3] 张丽,徐玉琴,王增平,等.包含同步发电机及电压源逆变器接口的微网控制策略[J].电网技术,2011,35(3):170-176. Zhang Li,Xu Yuqin,Wang Zengping,et al.Control scheme of microgrid fed by synchronous generator and voltage source inverter[J].Power System Technology,2011,35(3):170-176. [4] 张明锐,黎娜,杜志超,等.基于小信号模型的微网控制参数选择与稳定性分析[J].中国电机工程学报,2012,32(25):9-19. Zhang Mingrui,Li Na,Du Zhichao,et al.Control parameter selection and stability analysis of microgrid based on small-signal model[J].Proceedings of the CSEE,2012,32(25):9-19. [5] 张兴,余畅舟,刘芳,等.光伏并网多逆变器并联建模及谐振分析[J].中国电机工程学报,2014,34(3):336-345. Zhang Xing,Yu Changzhou,Liu Fang,et al.Modeling and resonance analysis of multi-paralleled grid-tied inverters in PV systems[J].Proceedings of the CSEE,2014,34(3):336-345. [6] 方天治,阮新波,肖岚,等.一种改进的分布式逆变器并联控制策略[J].中国电机工程学报,2008,28(33):30-36. Fang Tianzhi,Ruan Xinbo,Xiao Lan,et al.An improved distributed control strategy of parallel inverters[J].Proceedings of the CSEE,2008,28(33):30-36. [7] 汪东,邓焰,何湘宁.逆变电源并联技术的现状与发展[J].电力电子,2007(3):8-13. Wang Dong,Deng Yan,He Xiangning.Present state and future development of parallel inverters technology[J].Power Electronics,2007(3):8-13. [8] Mohamed Y A R I,EI-Saadan E F.Adaptive decentralized droop controller to preserve power sharing stability generation microgrids[J].IEEE Transactions on Power Electronics,2008,23(6):2806-2816. [9] 张宇,段善旭,康勇,等.死区带来的谐波环流抑制问题逆变器并联系统中谐波环流抑制的研究[J].中国电机工程学报,2006,26(12):67-72. Zhang Yu,Duan Shanxu,Kang Yong,et al.The research of harmonic circulating current restrain in parallel inverter systems[J].Proceedings of the CSEE,2006,26(12):67-72. [10]余蜜,康勇,张宇,等.基于环流阻抗的逆变器并联控制策略[J].中国电机工程学报,2008,28(18):42-46. Yu Mi,Kang Yong,Zhang Yu,et al.Research on a novel current-sharing scheme based on circulating impedance of multi-inverter parallel system[J].Proceedings of the CSEE,2008,28(18):42-46. [11]于玮,徐德鸿.基于虚拟阻抗的不间断电源并联系统均流控制[J].中国电机工程学报,2009,29(24):32-39. Yu Wei,Xu Dehong.Control scheme of paralleled UPS system based on output virtual resistance[J].Proceedings of the CSEE,2009,29(24):32-39. [12]Sun Jian.Impedance-based stability criterion for grid-connected inverters[J].IEEE Transactions on Power Electronics,2011,26(11):3075-3078. [13]Wang Xiongfei,Frede Blaabjerg,Chen Zhe,et al.Resonance analysis in parallel voltage-controlled distributed generation inverters[C]//Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition,2013:2977-2983. [14]Liu Guihua,Yang Yulin,Wang Pangbao,et al.Stability control method based on virtual inductance of grid-connected PV inverter under weak grid[C]//IECON 2013-39th Annual Conference of the IEEE Industrial Electronics Society,2013:1867-1872. [15]姜世公,王卫,刘桂花,等.微网孤岛运行条件下基于导纳域的稳定性研究[J].电力自动化设备,2013,33(5):19-25. Jiang Shigong,Wang Wei,Liu Guihua,et al.Study on the stability of admittance based on Microgrid islanded operation conditions[J].Electric Power Automation Equipment,2013,33(5):19-25. [16]张庆海,罗安,陈燕东,等.并联逆变器输出阻抗分析及电压控制策略[J].电工技术学报,2014,29(6):98-104. Zhang Qinghai,Luo An,Chen Yandong,et al.Analysis of output impedance for parallel inverters and voltage control strategy[J].Transactions of China Electrotechnical Society,2014,29(6):98-104. [17]Wang T C Y,Ye Zhihong,Sinha G,et al.Output filter design for a grid-interconnected three-phase inverter[C]//IEEE 34th Annual Power Electronics Specialist Conference,2003,2:779-784. [18]郭小强,邬伟扬,顾和荣.并网逆变器 LCL 接口直接输出电流控制建模及稳定性分析[J].电工技术学报,2010,25(3):102-109. Guo Xiaoqiang,Wu Weiyang,Gu Herong,et al.Modeling and stability analysis of direct output current control for LCL interfaced grid-connected inverters[J].Transactions of China Electrotechnical Society,2010,25(3):102-109. [19]Zhang Chi,Tomislav D,Juancho C,et al.Resonance damping techniques for grid-connected voltage source converters with LCL filters-a review[C]//Proceedings of the 2014 IEEE International Energy Conference,Dubrovnik,Croatia,2014:169-176. [20]He Jinwei,Li Yunwei,Bosnjak D,et al.Investigation and active damping of multiple resonances in a parallel-inverter-based microgrid[J].IEEE Transactions on Power Electronics,2013,28(1):234-246. [21]曾正,赵荣祥,吕志鹏,等.光伏并网逆变器的阻抗重塑与谐波谐振抑制[J].中国电机工程学报,2014,34(27):4547-4557. Zeng Zheng,Zhao Rongxiang,Lü Zhipeng,et al.Impedance reshaping of grid-tied inverters to damp the series and parallel harmonic resonances of photovoltaic systems[J].Proceedings of the CSEE,2014,34(27):4547-4557. [22]He Jinwei,Li Yunwei.Generalized closed-loop control schemes with embedded virtual impedances for voltage source converters with LC or LCL filters[J].IEEE Transactions on Power Electronics,2012,27(4):1850-1861. [23]许津铭,谢少军,肖华锋,等.LCL 滤波器有源阻尼控制机制研究[J].中国电机工程学报,2012,32(9):27-33. Xu Jinming,Xie Shaojun,Xiao Huafeng,et al.Research on control mechanism of active damping for LCL filters[J].Proceedings of the CSEE,2012,32(9):27-33. [24]Jalili K,Bernet S.Design of LCL filters of active-front-end two level voltage-source converters[J].IEEE Transactions on Industrial Electronics,2009,56(5):1674-1689. [25]Blasko V,Kaura V.A novel control to actively damp resonance in input LC filter of a three-phase voltage source converter[J].IEEE Transactions on Industry Applications,1997,33(2):542-550. [26]鲍陈磊,阮新波,王学华,等.基于 PI 调节器和电容电流反馈有源阻尼的 LCL 型并网逆变器闭环参数设计[J].中国电机工程学报,2012,32(25):133-142. Bao Chenlei,Ruan Xinbo,Wang Xuehua,et al.Design of grid-connected inverters with LCL filter based on PI regulator and capacitor current feedback active damping[J].Proceedings of the CSEE,2012,32(25):133-142.
2016, Vol. 31 
