Resistor and Capacitor Based DC Circuit Breaker and Its Application in Flexible DC System

被引：0
|
作者：
Wang Y. [1 ]
Wang Y. [1 ]
Zeng Q. [1 ]
Liu C. [1 ]
机构：
[1] College of Electrical Engineering and Information Technology, Sichuan University, Chengdu
来源：
Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 01期
基金：
国家重点研发计划;
关键词：
DC fault; Fault isolation; Flexible DC system; Hybrid DC circuit breaker; Reclosing;
D O I：
10.13336/j.1003-6520.hve.20180822019
中图分类号：
学科分类号：
摘要：
In order to reduce the converter blocking probability after DC faults, and improve the effectiveness of fault isolation and reclosing of flexible DC system, we propose a new topology of DC circuit breaker, named as RC-DCCB (resistor and capacitor based DC circuit breaker, RC-DCCB). The breaking branch of the RC-DCCB is specially added by a capacitor, a charge resistor and a dump resistor, which can suppress fault current, resume DC voltage and DC current by capacitor charging and resistor absorbing energy. Moreover, the fault isolation and auto-reclosing strategies of flexible DC system based on RC-DCCB are studied correspondingly. The strategies can maintain DC voltage and current during deionization stage without converter blocking or control mode switching, which are helpful for operation stabilization and power restoration of AC and DC system. In addition, since the RC breaking branch is parallel to DC bus as a shared shunt branch of multiple DC lines, the DCCB is economical when the converter has several outlines. A test system based on half-bridge MMC is built in PSCAD/EMTDC to simulate the RC-DCCB and its fault clearing scheme, the results prove its validity. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.
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页码：1 / 11
页数：10
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