基于相位裕度补偿的大型光伏电站谐波谐振抑制策略

摘要
图/表
参考文献
相关文章 (8)

全文: PDF (3934 KB)
输出: BibTeX | EndNote (RIS)

摘要

将电网阻抗对大型光伏电站的影响等效转换为对各台逆变器的影响,分析了等效电网阻抗对系统有源阻尼及稳定裕度的影响:电网阻抗的变化不会使系统有源阻尼失效而引发谐波谐振,但会使系统稳定裕度降低。通过分析稳定裕度对开环截止频率和相位交界频率处闭环增益的影响,揭示出系统谐波谐振机理:稳定裕度的减小导致系统对开环截止频率或相位交界频率谐波的放大作用增强,稳定裕度减小到零时,系统对相应频率谐波的放大作用为无穷大,将引发谐波谐振现象。提出一种基于相位裕度补偿的谐波谐振抑制策略,即采用超前环节补偿系统相位,通过比例环节调整开环截止频率,实现对相位裕度的补偿。所提抑制策略可使系统维持足够的稳定裕度,从本质上抑制了谐波谐振的发生。仿真及实验结果验证了理论分析的正确性。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章
	郑晨
	周林
	解宝
	郭珂
	刘强

关键词 ：大型光伏电站, 相位裕度补偿, 谐波谐振机理, 抑制策略, 电网阻抗

Abstract：

The influence of the grid impedance to large-scale photovoltaic(LSPV) plants is studied through analyzing its effect on each inverter in LSPV plants.According to studies on active damping and stability margin,the grid impedance variation does not make active damping ineffective.Instead,it attenuates the stability margin.The harmonic resonance mechanism has been revealed by researching the influence of stability margin reduction on current closed-loop gain around the open loop cutoff and phase crossover frequencies.Amplification to harmonics at the open loop cutoff frequency or the phase crossover frequency will be strengthened with the decrease of the stability margin.The amplification tends to be infinite when the stability margin reduces to zero,which will trigger harmonic resonance.Anovel suppression strategy based on phase margin compensation is then proposed.The phase margin compensation is realized by using the leading network to compensate the phase and the proportional component to regulate the open loop cutoff frequency in the strategy.The suppression strategy can keep enough stability margins for the system which will suppress the harmonic resonance essentially.The result of simulation and experiment validate the theory analysis in the paper.

Key words： Large-scale photovoltaic plants phase margin compensation harmonic resonance mechanism suppression strategy grid impedance

收稿日期: 2015-05-07 出版日期: 2016-11-02

PACS:

TM615

基金资助:

国家自然科学基金(51477021)和国家高技术研究发展计划(863计划)(2011AA05A301)资助项目。

作者简介: 郑晨男,1990年生,博士研究生,研究方向为大型光伏电站谐波谐振机理及抑制策略。E-mail:zhengchen725@163.com(通信作者)周林男,1961年生,博士,教授,博士生导师,研究方向为微电网及新能源。E-mail:zhoulin@cqu.edu.cn

引用本文:

郑晨,周林,解宝,郭珂,刘强. 基于相位裕度补偿的大型光伏电站谐波谐振抑制策略[J]. 电工技术学报, 2016, 31(19): 85-96. Zheng Chen,Zhou Lin,XieBao, Guo Ke, Liu Qiang. The Harmonic Resonance Suppression Strategy of Large-Scale Photovoltaic Plants Based on Phase Margin Compensation. Transactions of China Electrotechnical Society, 2016, 31(19): 85-96.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I19/85

[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] 李响,白首华,颜铭.大容量光伏电站并网稳定性分析及措施[J].电气应用,2014,33(22):20-23.
Li Xiang,Bai Shouhua,Yan Ming.Stability analysis and measurement of large-scale grid-connected photovoltaic power plants[J].Electrotechnical Application,2014,33(22):20-23.
[3] 周林,任伟,廖波,等.并网型光伏电站无功电压控制[J].电工技术学报,2015,30(20):168-175.
Zhou Lin,Ren Wei,Liao Bo,et al.Reactive power and voltage control for grid-connected PV power plants[J].Transactions of China Electro technical Society,2015,30(20):168-175.
[4] Varma R,Salama M.Large-scale photovoltaic solar power integration in transmission and distribution networks[C]//IEEE Power and Energy Society General Meeting,Detroit,Michigan,USA,2011:1-4.
[5] 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.
[6] 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 Transactions on Power Electronics,2011,26(3):770-785.
[7] 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].Transactions of China Electrotechnical Society,2013,28(9):214-223.
[8] He J W,Li Y W,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.
[9] 胡伟,孙建军,马谦,等.多逆变器并网系统谐振特性分析[J].电力自动化设备,2014,34(7):93-98.
Hu Wei,Sun Jianjun,Ma Qian,et al.Resonant characteristics of multi-inverter grid-connection system[J].Electric Power Automation Equipment,2014,34(7):93-98.
[10]张兴,余畅舟,刘芳光,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 Fangguang,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.
[11]Wang X,Blaabjerg F,Liserre M,et al.An active damper for stabilizing power electronics based AC systems[J].IEEE Transactions on Power Electronics,2014,29(7):3318-3329.
[12]Yang Dongsheng,Ruan Xinbo,Wu Heng.Impedance shaping of the grid-connected inverter with LCL filter to improve its adaptability to the weak grid condition[J].IEEE Transactions on Power Electronics,2014,29(11):5795-5805.
[13]Wang Jing,Song Yulun,Monti A.A study of feedforward control on stability of grid parallel inverter with various grid impedance[C]//IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems (PEDG),Galway,Ireland,2014:1-8.
[14]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,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):4547-4558.
[15]Pena-Alzola R,Liserre M,Blaabjerg F,et al.A self-commissioning notch filter for active damping in a three-phase LCL-filter-based grid-tie converter[J].IEEE Transactions on Power Electronics,2014,29(12):6754-6761.
[16]Mohamed Y.Suppression of low-and high-frequency instabilities and grid-induced disturbances in distributed generation inverters[J].IEEE Transactions on Power Electronics,2011,16(12):3790-3803.
[17]Rubén 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.
[18]胡书举,龚文明,李丰林,等.一种并网逆变器无交流电压传感器控制策略研究[J].电工技术学报,2015,30(14):325-332.
Hu Shuju,Gong Wenming,Li Fenglin,et al.Research on a kind of AC voltage sensorless control strategy of grid-connected inverter[J].Transactions of China Electrotechnical Society,2015,30(14):325-332.
[19]陈新,韦徵,胡雪峰,等.三相并网逆变器 LCL 滤波器的研究及新型有源阻尼控制[J].电工技术学报,2014,29(6):71-79.
Chen Xin,Wei Zheng,Hu Xuefeng,et al.Research on LCL filter in three-phase grid-connected inverter and novel active damping control strategy[J].Transactions of China Electrotechnical Society,2014,29(6):71-79.
[20]Brogan W L.Modern control theory[M].Upper Saddle River,NJ,USA:Prentice-Hall,1985.
[21]Cespedes M,Sun J.Online grid impedance identification for adaptive control of grid-connected inverters[C]//IEEE Conference on Energy Conversion Congress and Exposition (ECCE),Raleigh,NC,USA,2012:914-921.
[22]Liserre M,Blaabjerg F,Teodorescu R.Grid impedance estimation via excitation of LCL-filter resonance[J].IEEE Transactions on Industry Application,2007,43(12):1401-1407.
[23]侯李祥,卓放,师洪涛,等.基于系统稳定性分析的微电网阻抗测量技术[J].电工技术学报,2015,30(22):153-162.
Hou Lixiang,Zhuo Fang,Shi Hongtao,et al.New techniques for measuring impedance characteristics of an islanded microgrid based on stability analysis[J].Transactions of China Electrotechnical Society,2015,30(22):153-162.