中文摘要：

提出具有双级LC滤波电路的动态电压恢复器（DVR）,以解决采用单级滤波器时输出电压易受负荷谐波电流影响的问题,同时更好地滤除高频开关谐波,减小电感与电容容量。首先建立了采用双级LC滤波电路的DVR的数学模型,根据Routh稳定判据分析了系统的稳定性,并给出了控制系统参数的设计方法,进行了采用双级和单级LC滤波器DVR响应特性的比较。通过仿真和实验验证了所提出的具有双级LC滤波电路的DVR能更加有效地提高输出电压的质量,抑制负载谐波电流对DVR系统的影响。

英文摘要：

The DVR（Dynamic Voltage Restorer） with double-stage LC filter is applied to eliminate the in- fluence of load harmonic current on the output voltage of DVR with single-stage LC filter and to filter out the switching-frequency harmonic with smaller inductance and capacitance. The mathematical model of DVR with double-stage LC filter is established and its system stability is analyzed according to Routh criterion. The parameter design of its control system is proposed and its response performance is compared with that of DVR with single-stage LC filter. Simulative and experimental results prove that,the DVR with double- stage LC filter suppresses the influence of load harmonic current on the DVR system to effectively enhance its output voltage quality.