中压动态电压恢复器的虚拟阻抗控制策略  

Control Strategy of MV Dynamic Voltage Restorer as Virtual Impedance

作　　者：周武[1] 乐健[1] 杨金涛[1] 杜旭[1] 刘开培[1] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072

出　　处：《电网技术》2016年第8期2525-2532,共8页Power System Technology

摘　　要：中压动态电压恢复器(dynamic voltage restorer,DVR)可用于有效保护大范围的用户不受电压暂降的影响,但不能补偿其下游馈线上发生故障时的电压扰动。提出了将DVR控制为虚拟阻抗的方法,推导了系统传递函数,利用Bode图与劳斯-赫尔维茨(Routh-hurwitz)稳定判据,分析了控制DVR为虚拟阻抗的可行性和系统稳定性。给出了将DVR控制为虚拟电感从而实现故障限流器,以及将DVR控制为虚拟电容从而实现串联补偿的方法。通过仿真和实验验证了所提方案的可行性与有效性。为拓展中压DVR的功能,提高其实用化水平提供了参考。MV dynamic voltage restorer can be used to protect a group of customers from voltage sags caused by faults in power system except those happening at downstream of DVR. Method controlling DVR as virtual impedance is proposed in this paper. Transfer function is derived and stability and feasibility are analyzed according to Bode figure and Routh-Hurwitz criterion. Controlling DVR as virtual inductance to limit fault current and as virtual capacitor to compensate voltage loss is taken as examples. Simulation and experiment results verify feasibility and effectiveness of the proposed scheme. This paper provides a reference for expanding functions of MV DVR and improving its practical application.

关 键 词：动态电压调节器 电压暂降 虚拟阻抗 故障限流 串联补偿 

分 类 号：TM72[电气工程—电力系统及自动化]