一种新型多目标串联型短路限流控制器的研究

Research on a New Type of the Series Fault Current-limiting Controller With Multiple Objective

提出一种串联型短路限流控制器,采用背靠背换流器与限流电抗器串联的方式,在系统未发生短路故障时,背靠背换流器可以实现电压补偿、谐波抑制等功能,当发生短路时,将换流器切出,使短路限流电抗器工作。分析了电路的拓扑结构和控制原理,采用完全补偿法对电压进行补偿,采用电源电流检测法滤除系统中的谐波,然后用PSCAD进行了仿真和实验验证。

A kind of series fault current limiting controller is proposed,the pattern that back-to-back converter is in series with current limiting reactor adopted.When the short-circuit fault doesn＇t happen,back-to-back converter can enforce the function of voltage compensation and harmonic suppression.When the short-circuit fault happens,the con-verter is cut out,and the current limiting reactor is working.The topological structure and control principle are stud-ied.The method of pre-sag compensation is adopted to compensate the voltage while the detecting method of the source current is used for filtering.According to the control methods,the feasibility of this method is validated by the simulation,using PSCAD.Finally,the work that have been done is summarized.