摘要
配电系统电压跌落时,动态电压恢复器(dynamic vltage restorer,DVR)可以维持敏感负荷侧的电压稳定。文中介绍了级联动态电压恢复器(interline dynamic vltage restorer,IDVR)的结构,该IDVR把不同馈线上2个或2个以上的DVR通过1个直流电容连接起来,当其中一个DVR补偿电压跌落时,另一个DVR对直流电容充电。文中还分析比较了DVR的补偿策略,指出基于最小能量补偿法的IDVR系统可持续补偿较严重的电压跌落,并将负荷电压外环、滤波器电容电流内环的双闭环控制方法应用到IDVR系统中,提高了IDVR系统的阻尼比。仿真实验验证了该IDVR系统的正确性和有效性。
In distribution systems, the voltage stability at voltage-sensitive load side can be maintained by dynamic voltage restorer （DVP,） while voltage sag occurs. The authors present the structure of interline dynamic voltage restorer （IDVR）. IDVR connects two or more DVRs in different feeders via a DC Capacitor, when one of the DVRs compensates the voltage sag, another DVR connected to a common dc link charges the DC capacitor, and thus the DC-link energy storage is replenished. The compensation strategies of DVR are analyzed and compared and it is pointed out that severe voltage sags can be persistently compensated by IDVR system based on energy optimum compensation. Applying the dual close-loop control algorithm for inner capacitance current loop and outer load voltage loop to IDVR system, the damping ratio of IDVR system can be enhanced. The correctness and effectiveness of the IDVR system are＇ verified by simulation results of a simple system.
出处
《电网技术》
EI
CSCD
北大核心
2007年第12期74-77,共4页
Power System Technology
基金
天津市重点科技攻关项目(033186611)。
