新型动态电压恢复器对短路故障电流主动调节的研究  

Active short circuit current adjustment by modified dynamic voltage restorer

作　　者：姜飞[1] 涂春鸣[2] 熊龙珠 郭祺[2] 吴连贵[2] 

机构地区：[1]长沙理工大学电气与信息工程学院,湖南长沙410004 [2]湖南大学国家电能变换与控制工程技术研究中心,湖南长沙410082 [3]国网张家界供电局,湖南张家界427000

出　　处：《电力自动化设备》2017年第9期139-145,共7页Electric Power Automation Equipment

基　　金：国家自然科学基金资助项目(51377051)~~

摘　　要：提出在动态电压恢复器(DVR)系统的串联逆变器交流输出端增设反并联晶闸管支路的拓扑,以实现动态电压补偿功能与故障电流限制功能。分析所提拓扑的故障电流限制功能机理,建立其运行数学模型;在限流功能动态过程分析基础上,提出一种通过调整晶闸管触发相位角的故障电流调节方法,给出限流阻抗的调节范围,从而解决限流阻抗与电网原有过流保护的配合问题;最后,采用PSCAD/EMTDC仿真软件和实验室样机,验证所提拓扑及控制方法的正确性。A modified topology of DVR（Dynamic Voltage Restorer） is proposed,which has an additional bidirectional thyristor branch across the output terminals of series inverter to realize the functions of dynamic voltage compensation and fault-current limiting. The mechanism of its fault-current limiting is analyzed and an operating model is established,based on which,a method of fault-current adjustment by changing the firing angle of thyristor is proposed and the adjustment range of current limiting impedance is developed for its cooperation with the existing over-current protection of grid. The correctness of the proposed topology and adjustment method is verified by the simulation based on the PSCAD/EMTDC software and a lab prototype.

关 键 词：动态电压恢复器 故障限流 滤波器 多功能 主动调节 

分 类 号：TM761[电气工程—电力系统及自动化]