弱电网下有源滤波器谐振与抑制策略研究  

Research on resonance and suppression strategy of active power filter in weak grid

作　　者：唐钰政 刘书铭 张博 王毅 郑晨 TANG Yuzheng;LIU Shuming;ZHANG Bo;WANG Yi;ZHENG Chen(Electric Power Research Institute,State Grid Henan Electric Power Company,Zhengzhou 450000,China)

机构地区：[1]国网河南省电力公司电力科学研究院,河南郑州450000

出　　处：《武汉大学学报（工学版）》2023年第1期122-128,共7页Engineering Journal of Wuhan University

基　　金：国家电网有限公司总部科技项目(编号:5400201924179A0000)。

摘　　要：在电容补偿装置接入的电网场景下,并联型有源电力滤波器的补偿性能会受到严重影响。为此,研究了电容补偿装置和有源电力滤波器共同接入电网运行时,电网强度对系统稳定性的影响。首先,建立有源电力滤波器的诺顿等效电路。然后,在并联电容补偿装置接入后,分析了负载电流检测位置不同时,电网阻抗对系统稳定性的影响。结果表明,在弱电网条件下,系统会发生谐振并恶化有源电力滤波器的补偿效果,同时随着电网强度的降低,谐振频率有向低频段移动的趋势。针对产生的谐振问题,提出了一种引入虚拟阻抗的谐振抑制策略。最后,通过仿真验证了理论分析的正确性和引入虚拟阻抗谐振抑制策略的有效性。In the grid scenario that the capacitor compensation device is connected, the compensation performance of the parallel active power filter will be seriously affected. In this regard, this paper studies the influence of power grid strength on the system stability when the capacitor compensation device and the active power filter are connected to the power grid operation. Firstly, the Norton equivalent circuit of the active power filter is established. Then, the influence of the grid impedance on the system stability is analyzed when the load current detection position is different after the parallel capacitor compensation device is connected. The results show that the system will resonate and deteriorate the compensation effect of the active power filter in weak grid. At the same time, the resonance frequency tends to move to the low frequency band with the decrease of the grid strength. To solve the resonant problem, this paper also proposes a resonance suppression strategy by introducing virtual impedance. Finally, the correctness of theoretical analysis and the effectiveness of introducing virtual impedance resonance suppression strategy are verified by simulation.

关 键 词：并联型有源电力滤波器 并联电容补偿装置 补偿性能 谐振抑制 

分 类 号：TM46[电气工程—电器]