中文摘要：

为满足动态电压恢复器（DVR）大容量、高可靠性和灵活性的要求。采用变流装置串、并联这一有效手段，借鉴有源电力滤波器（APF）、配电网静止同步补偿器（DSTATCOM）等并联研究的相关成果．探讨适合多个DVR装置串联的拓扑结构和控制方法。提出了集中控制方式和分散控制方式．并进一步细分为5种运行模式，其中集中控制方式又细分为按容量比分配、按各自容量限幅分配以及按各自功能分配补偿电压的3种运行模式，分散控制方式又细分为均分参考补偿电压和以容量限幅分配参考补偿电压2种运行模式。以均分参考电压的分散控制模式为例，分析可知双DVR在该种联合运行模式下与单台DVR独立运行2种工作方式的特性类似。仿真结果表明．所提出的5种运行模式均具有良好的可行性。

英文摘要：

The effective technology of series-parallel connection is applied to meet the requirement of DVR （Dynamic Voltage Restorer） for large-capacity,high-reliability and flexibility,and the topological structure and control method of multiple series-connected DVRs are discussed based on the research results of parallel operating APFs and DSTATCOMs. Both centralized control and distributed control are presented and five operating modes are suggested. Three operating modes are applicable for centralized control：the compensation voltage is allocated according to capacity ratio,capacity limitation or function. Two operating modes are applicable for distributed control：the compensation voltage is allocated equally or according to capacity limitation. The operating mode of equally allocated compensation voltage for distributed control is analyzed as an example,which shows that,the working characteristics of two DVRs operating in this mode are similar to those of single DVR operating independently. Simulative results prove the proposed five operating modes have good feasibility.