电工技术学报2017，Vol.32Issue(11)：48-56,9.
一种基于电压反馈控制的配电网短路故障柔性限流方法
A Flexible Current Limiting Method of Distribution Network Short Circuit Fault Based on the Voltage Feedback Control
摘要
Abstract
The short circuit current can be limited quickly after being detected in the incipient stage of short circuit fault,in this case,the operation safety of power system can be ensured.In this paper,the area surrounded by current half-cycle curve and the time axis is taken as the criterion of early detection on short circuit fault.Combining the characteristics of distribution network short circuit fault with the output features of cascaded H-bridge converter,a method based on three single-phase cascaded H-bridge multi-level converters is proposed in flexible short-current limiting.These converters are connected to the grid via coupled capacitors.The voltage signal is selected as the feedback so that the converters can generate output voltage to achieve the goal of limiting fault current using an appropriate control method.The simulation results show that based on the early detection,the proposed method can suppress the first peak value of the fault current to mitigate the harms and relieve the burden of circuit breaker.In addition,the selection of faulty phases is unnecessary.关键词
配电网/短路故障/早期检测/柔性限流/级联H桥变流器Key words
Distribution network/short circuit fault/early detection/flexible current limiting/cascaded H-bridge converter分类
信息技术与安全科学引用本文复制引用
郭谋发,游林旭,魏晓莹,高伟,杨耿杰..一种基于电压反馈控制的配电网短路故障柔性限流方法[J].电工技术学报,2017,32(11):48-56,9.基金项目
国家自然科学基金项目(51677030,51377023)和福建省自然科学基金项目(2016J01218)资助. （51677030,51377023）
