电网畸变条件下基于LCL型滤波的STATCOM电流控制策略研究  

Study of Current Control Strategy of STATCOM Based on LCL Filter Under Distorted Grid Conditions

作　　者：刘俊[1] 杨帆[1] 张一彦[2] 

机构地区：[1]国网上海市电力公司电力科学研究院,上海200437 [2]国网上海市电力公司嘉定供电公司,上海201800

出　　处：《电力与能源》2014年第6期665-671,共7页Power & Energy

摘　　要：在节约总电感用量的前提下,为了提高系统的滤波性能,选择LCL型滤波器作为配电网STATCOM(D-STATCOM)的输出滤波器。LCL型滤波器是一个三阶系统,采用直接入网电流控制时谐振峰的存在会影响系统的稳定性。为此,提出一种基于状态反馈的虚拟阻抗法用于抑制LCL型滤波器的谐振峰,从而避免无源阻尼法增大系统的损耗。由于电网电压中含有谐波含量会造成补偿电流畸变,从而不能准确跟踪其指令值,针对这一问题,提出一种多谐振比例谐振(PR)控制器,用于增大特定频率处电网电压对入网电流的输入阻抗,从而抑制电网谐波电压的扰动,优化补偿电流波形,提高电流追踪性能。仿真和实验结果证实了控制策略的有效性。In order to improve the filtering performance of the system with small inductor,LCL filter is selected as the output filter of distribution static synchronous compensator（D-STATCOM）.LCL filter is a threeorder system,the resonant peak may result in the instability of system.State-feedback control based on virtual impedance is proposed to suppress the resonant peak,which reduces system losses compared with passive damping.The grid voltage harmonics result in the distortion of compensation current,which makes the compensation current not track its reference.A multi-resonance proportional resonant（PR）regulator is proposed to increase the grid input impedance at a specific frequency,which rejects the disturbance of grid harmonics and improves the current tracking performance.Simulation and experimental results prove the validity of this method.

关 键 词：并网逆变器 D-STATCOM LCL型滤波器 虚拟阻抗 特征谐波消除 

分 类 号：TM464[电气工程—电器]