多机并联接入弱电网的改进型带阻滤波器高频振荡的抑制
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摘要
多机接入弱电网的同一公共耦合点时,多机与电网之间的交互作用对系统的稳定可靠运行是一个潜在威胁。传统的引入带阻滤波器的网侧电感电流反馈控制方法能在一定程度上抑制多机并联的高频振荡,但会导致稳定性降低,甚至不稳定。为此,提出一种多机并联的改进型带阻滤波器高频振荡抑制方法,该方法不仅能有效地抑制多机并联的谐波电流流入电网,避免阻抗网络的高频振荡现象发生,而且能提高系统的相位裕度,保证系统在弱电网下具有足够的稳定和较好的动态性能。考虑改进型带阻滤波器的陷波深度和动态性能,选取合适的控制参数。实验结果验证了所提方法的有效性。
When multi-parallel inverters are connected to weak grid at the same point of common coupling, the interaction between multi-parallel inverters and the grid is a potential threat to the stable and reliable operation of the system. The traditional grid-side inductance current feedback control method with notch filter can suppress the high-frequency oscillation of multi-parallel inverters in a certain extent. But it will lead to the stability reduction and even instability. Thus, the suppression method of high-frequency oscillation by improved notch filter is proposed for multi-paralleled inverters.This method not only effectively restrains multi-parallel inverters' harmonic current into the grid, and avoids the high-frequency oscillation of impedance network, but also improves the phase margin of the system, and ensures the sufficient stability and better dynamic performance of the system in the weak grid. Considering the notch depth and dynamic performance of the improved notch filter, the appropriate control parameters are selected. Experimental results verify the validity of the proposed method.
When multi-parallel inverters are connected to weak grid at the same point of common coupling, the interaction between multi-parallel inverters and the grid is a potential threat to the stable and reliable operation of the system. The traditional grid-side inductance current feedback control method with notch filter can suppress the high-frequency oscillation of multi-parallel inverters in a certain extent. But it will lead to the stability reduction and even instability. Thus, the suppression method of high-frequency oscillation by improved notch filter is proposed for multi-paralleled inverters.This method not only effectively restrains multi-parallel inverters' harmonic current into the grid, and avoids the high-frequency oscillation of impedance network, but also improves the phase margin of the system, and ensures the sufficient stability and better dynamic performance of the system in the weak grid. Considering the notch depth and dynamic performance of the improved notch filter, the appropriate control parameters are selected. Experimental results verify the validity of the proposed method.
引文
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[14]吕志鹏,盛万兴,钟庆昌,等.虚拟同步发电机及其在微电网中的应用[J].中国电机工程学报,2014,34(16):2591-2603.LüZhipeng,Sheng Wanxing,Zhong Qingchang,et al.Virtual synchronous generator and its applications in micro-grid[J].Proceedings of the CSEE,2014,34(16):2591-2603.
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[17]谢宁,罗安,陈燕东,等.大型光伏电站动态建模及谐波特性分析[J].中国电机工程学报,2013,33(36):10-17,4.Xie Ning,Luo An,Chen Yandong,et al.Dynamic modeling and characteristic analysis on harmonics of photovoltaic power stations[J].Proceedings of the CSEE,2013,33(36):10-17,4.
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[19]Wang Xiongfei,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.
[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]孙振奥,杨子龙,王一波,等.光伏并网逆变器集群的谐振原因及其抑制方法[J].中国电机工程学报,2015,35(2):418-425.Sun Zhen’ao,Yang Zilong,Wang Yibo,et al.The cause analysis and suppression method of resonances in clustered grid-connected photovoltaic inverters[J].Proceedings of the CSEE,2015,35(2):418-425.
[22]Zhang Shao,Jiang Shuai,Lu Xi,et al.Resonance issues and damping techniques for grid-connected inverters with long transmission cable[J].IEEETransactions on Power Electronics,2014,29(1):110-120.
[23]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,LüZhipeng,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.
[24]Jeong S G,Park M H.The analysis and compensation of dead-time effects in PWM inverters[J].IEEETransactions on Industrial Electronics,1991,38(2):108-114.
[25]胡寿松.自动控制原理[M].6版.北京:科学出版社,2013.
[2]靳伟,李永丽,卜立之,等.基于CPT理论和重复控制的多功能并网逆变器研究[J].电工技术学报,2018,33(18):4345-4356.Jin Wei,Li Yongli,Bu Lizhi,et al.Research on multi-functional grid-connected inverters based on conservative power theory and repetitive control[J].Transactions of China Electrotechnical Society,2018,33(18):4345-4356.
[3]陈汝昌,陈飞,张帆,等.新能源电网中微电源并网控制策略研究[J].电力系统保护与控制,2015,43(12):55-60.Chen Ruchang,Chen Fei,Zhang Fan,et al.Control strategies for grid-connected microsource in new energy power systems[J].Power System Protection and Control,2015,43(12):55-60.
[4]郑堃,周林,张前进,等.数字控制下光伏并网逆变器稳定性分析及参数优化设计[J].电工技术学报,2018,33(8):1802-1813.Zheng Kun,Zhou Lin,Zhang Qianjin,et al.Stability analysis and parameter optimization design of photovoltaic grid-connected inverter under digital control[J].Transactions of China Electrotechnical Society,2018,33(8):1802-1813.
[5]贾科,顾晨杰,毕天姝,等.大型光伏电站汇集系统的故障特性及其线路保护[J].电工技术学报,2017,32(9):189-198.Jia Ke,Gu Chenjie,Bi Tianshu,et al.Fault characteristics and line protection within the collection system of a large-scale photovoltaic power plant[J].Transactions of China Electrotechnical Society,2017,32(9):189-198.
[6]刘闯,田孝铜,王亚伟,等.单相多模块电压源型逆变器[J].电工技术学报,2017,32(24):88-96,114.Liu Chuang,Tian Xiaotong,Wang Yawei,et al.Single-phase multi-cell voltage source inverter[J].Transactions of China Electrotechnical Society,2017,32(24):88-96,114.
[7]丁明,王伟胜,王秀丽,等.大规模光伏发电对电力系统影响综述[J].中国电机工程学报,2014,34(1):1-14.Ding Ming,Wang Weisheng,Wang Xiuli,et al.Areview on the effect of large-scale PV generation on power systems[J].Proceedings of the CSEE,2014,34(1):1-14.
[8]田春光,田利,李德鑫,等.基于混合储能系统跟踪光伏发电输出功率的控制策略[J].电工技术学报,2016,31(14):75-83.Tian Chunguang,Tian Li,Li Dexin,et al.Control strategy for tracking the output power of photovoltaic power generation based on hybrid energy storage system[J].Transactions of China Electrotechnical Society,2016,31(14):75-83.
[9]帅智康,肖凡,涂春鸣,等.宽频域谐波谐振劣化机理及其抑制措施[J].电工技术学报,2013,28(12):16-23.Shuai Zhikang,Xiao Fan,Tu Chunming,et al.Resonance degradation mechanism of wide-band frequency harmonics and the elimination strategy[J].Transactions of China Electrotechnical Society,2013,28(12):16-23.
[10]曾博,杨煦,张建华.考虑可再生能源跨区域消纳的主动配电网多目标优化调度[J].电工技术学报,2016,31(22):148-158.Zeng Bo,Yang Xu,Zhang Jianhua.Multi-objective optimization for active distribution network scheduling considering renewable energy harvesting across regions[J].Transactions of China Electrotechnical Society,2016,31(22):148-158.
[11]王逸超,罗安,金国彬,等.单相LCL型并网逆变器新型谐波阻尼策略[J].中国电机工程学报,2014,34(33):5803-5810.Wang Yichao,Luo An,Jin Guobin,et al.New harmonic damping strategy for single grid-connected inverter with LCL filter[J].Proceedings of the CSEE,2014,34(33):5803-5810.
[12]匡慧敏,罗安,陈智勇,等.多逆变器并网耦合谐振机理及有源阻尼优化方法[J].电网技术,2016,40(4):1180-1189.Kuang Huimin,Luo An,Chen Zhiyong,et al.Coupling resonances mechanism of grid-connected multi-parallel inverters and its active damping parameter optimal method[J].Power System Technology,2016,40(4):1180-1189.
[13]Agorreta J L,Borrega M,Lopez J,et al.Modeling and control of N-paralleled grid-connected inverters with LCL filter coupled due to grid impedance in PVplants[J].IEEE Transactions on Power Electronics,2011,26(3):770-785.
[14]吕志鹏,盛万兴,钟庆昌,等.虚拟同步发电机及其在微电网中的应用[J].中国电机工程学报,2014,34(16):2591-2603.LüZhipeng,Sheng Wanxing,Zhong Qingchang,et al.Virtual synchronous generator and its applications in micro-grid[J].Proceedings of the CSEE,2014,34(16):2591-2603.
[15]Wang Fei,Duarte J L,Hendrix M A M,et al.Modeling and analysis of grid harmonic distortion impact of aggregated DG inverters[J].IEEE Transactions on Power Electronics,2011,26(3):786-797.
[16]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):9-16,4.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.
[17]谢宁,罗安,陈燕东,等.大型光伏电站动态建模及谐波特性分析[J].中国电机工程学报,2013,33(36):10-17,4.Xie Ning,Luo An,Chen Yandong,et al.Dynamic modeling and characteristic analysis on harmonics of photovoltaic power stations[J].Proceedings of the CSEE,2013,33(36):10-17,4.
[18]Remon D,Cantarellas A M,Mauricio J M,et al Power system stability analysis under increasing penetration of photovoltaic power plants with synchronous power controllers[J].IET Renewable Power Generation,2017,11(6):733-741.
[19]Wang Xiongfei,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.
[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]孙振奥,杨子龙,王一波,等.光伏并网逆变器集群的谐振原因及其抑制方法[J].中国电机工程学报,2015,35(2):418-425.Sun Zhen’ao,Yang Zilong,Wang Yibo,et al.The cause analysis and suppression method of resonances in clustered grid-connected photovoltaic inverters[J].Proceedings of the CSEE,2015,35(2):418-425.
[22]Zhang Shao,Jiang Shuai,Lu Xi,et al.Resonance issues and damping techniques for grid-connected inverters with long transmission cable[J].IEEETransactions on Power Electronics,2014,29(1):110-120.
[23]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,LüZhipeng,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.
[24]Jeong S G,Park M H.The analysis and compensation of dead-time effects in PWM inverters[J].IEEETransactions on Industrial Electronics,1991,38(2):108-114.
[25]胡寿松.自动控制原理[M].6版.北京:科学出版社,2013.