Harmonic Resonance Mechanism Study of Large-Scale Photovoltaic Power Plants

doi:10.11930/j.issn.1004-9649.201702058

Abstract

Abstract: Grid impedance that cannot be ignored between Large-Scale Photovoltaic Plants(LSPV) and the grid makes interaction among LSPV, grid and parallel inverters in LSPV. The interaction leads to system harmonic resonance. In order to study the LSPV resonance mechanism, a decoupling model that transforms multi-inverters parallel system into equivalent single inverter system is established. Then functions related to grid impedance, parallel inverters number, resonant frequency, damping ratio, stability margin are derived based on proposed decoupled model. A deep analysis on impact for system stability caused by grid impedance and the number of parallel inverters is also given. The harmonic resonance mechanism of LSPV is revealed from the point of closed-loop gain. Grid impedance will not disable active damping and resonance is caused by stability margin reduction related to grid impedance. The study is validated through simulations and experiment.

Key words: large-scale photovoltaic plants, grid impedance, decoupling model, stability analysis, harmonic resonance mechanism

CLC Number:

TM712

ZHU Wu, LIU Yajuan. Harmonic Resonance Mechanism Study of Large-Scale Photovoltaic Power Plants[J]. Electric Power, 2018, 51(3): 121-130.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201702058

https://www.electricpower.com.cn/EN/Y2018/V51/I3/121

References

[1] 赵争鸣,雷一,贺凡波,等. 大容量并网光伏电站技术综述[J]. 电力系统自动化,2011,35(12):101-107. ZHAO Zhengming, LEI yi, HE Fanbo. et al. Overview of large-scale grid-connected photovoltaic power plants[J]. Automation of Electric Power Systems, 2011, 35(12):101-107.
[2] 王晶,张颖,陈骏宇,等. 基于免疫粒子群优化算法的微网谐波抑制方法[J].中国电力,2015,48(3):67-74 WANG Jing, ZHANG Ying, CHEN Junyu, et al. Harmonic suppression method for micro-grid based on immune particle swarm optimization algorithm[J]. Electric Power, 2015, 48(3):67-74.
[3] 谢宁,罗安,马伏军,等. 大型光伏电站与电网谐波交互影响[J]. 中国电机工程学报,2013,33(34):9-16. XIE Ning, LUO An, MA Fujun, et al. Harmonic interaction between large-scale photovoltaic power stations and grid[J]. Proceedings of the CSEE, 2013, 33(34):9-16.
[4] 周林,张密,居秀丽,等. 电网阻抗对大型并网光伏系统稳定性影响分析[J]. 中国电机工程学报,2013,33(34):34-41. ZHOU Lin, ZHANG Mi, JU Xiuli, et al. Stability analysis of large-scale photovoltaic plants due to grid impedances[J]. Proceedings of the CSEE, 2013,33(34):34-41.
[5] 杨明,周林,张东霞,等. 考虑电网阻抗影响的大型光伏电站并网稳定性分析[J]. 电工技术学报,2013,28(9):214-223. YANG Ming, ZHOU Lin, ZHANG Dongxia, et al. Stability analysis of large-scale photovoltaic power plants for the effect of grid impedance[J]. Trans of China Electrotechnical Society, 2013, 28(9):214-223.
[6] SUN J. Impedance-based stability criterion for grid-connected inverters[J]. IEEE Trans on Power Electronics, 2011, 26(11):3075-3078.
[7] 杨东升,阮新波,吴恒. 提高LCL型并网逆变器对弱电网适应能力的虚拟阻抗方法[J]. 中国电机工程学报,2014,34(15):2327-2335. YANG Dongsheng, RUAN Xinbo, WU Heng. A virtual impedance method to improve the performance of LCL-type grid-connected inverters under weak grid conditions[J]. Proceedings of the CSEE, 2014, 34(15):2327-2335.
[8] 严干贵,李龙,黄亚峰,等. 弱电网下联网光伏逆变系统稳定性分析及控制参数整定[J]. 太阳能学报,2013,34(11):1853-1859. YAN Gangui, LI Long, HUANG Yafeng, et al. Stability analysis and control parameters tuning of grid-connected photovoltaic inverter system in weak grid[J]. Acta Enegiae Solaris Sinica, 2013, 34(11):1853-1859.
[9] 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):4547-4558. ZENG Zheng, ZHAO Rongxiang, LU 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):4547-4558.
[10] AGORRETA J L, BORREGA M, LóPEZ J, et al. Modeling and control of N-paralleled grid-connected inverters with LCL filter coupled due to grid impedance in PV plants[J]. IEEE Trans on Power Electronics, 2011, 26(3-4):770-785.
[11] 许德志, 汪飞, 毛华龙, 等. 多并网逆变器与电网的谐波交互建模与分析[J]. 中国电机工程学报,2013,33(12):64-71. XU Dezhi, WANG Fei, MAO Hualong, et al. Modeling and analysis of harmonic interaction between multiple grid-connected inverters and the utility grid[J]. Proceedings of the CSEE, 2013, 33(12):64-71.
[12] HE J W, LI Y W, BOSNJAK D, et al. Investigation and active damping of multiple resonances in aparallel-inverter-based microgrid[J]. IEEE Trans on Power Electronics, 2013, 28(1):234-246.
[13] WANG X, BLAABJERG F, LISERRE M, et al. An active damper for stabilizing power electronics based AC systems[J]. IEEE Trans on Power Electronics, 2014, 29(7):3318-3329.
[14] RUB'EN I, TAKESHI S, YOSUKE F, et al. Parallel connection of grid-connected LCL inverters for MW scaled photovoltaic systems[C]//International Power Electronics Conference.Sapporo, Japan, 2010:1988-1993.
[15] CHEN S C, JIANG X J, CHAI J Y. Analysis of harmonic and circulating current for paralleling inverters in MW level wind energy conversion system[C]//International Conference on Electrical Machines and Systems. Wuhan, China, 2008:2489-2492.
[16] 赵清林,郭小强,邬伟扬.单相逆变器并网控制技术研究[J].中国电机工程学报,2007,27(16):60-64. ZHAO Qinglin, GUO Xiaoqiang, WU Weiyang. Research on control strategy for single-phase grid-connected inverter[J]. Proceedings of the CSEE, 2007, 27(16):60-64.