可控有源振荡直流断路器设计与试验

Design and Test of Controlled Active Oscillation DC Circuit Breaker

直流输配电网为大规模高比例可再生能源并网和大容量远距离电能传输等难题提供了解决方案,是构建以可再生能源为主体的新型电力系统重要发展方向。直流断路器可快速开断故障电流、有效隔离故障,是保证直流输配电网可靠运行的关键设备之一。但是目前直流断路器仍存在开断电流能力受限、价格昂贵等问题。文中针对可控有源振荡新型直流断路器拓扑,阐述其拓扑构成与开断、关合原理,完成参数设计数学解析及影响规律分析。开发出10kV可控有源振荡直流断路器样机,开展额定电流及故障电流双向电流开断试验,验证所提拓扑设计正确性和工程应用可行性。

The DC transmission and distribution network provides a solution to the problems of large-scale and high-proportion renewable energy grid connection and large-capacity long-distance power transmission,and it is an important development direction for building a new power system dominated by renewable energy.The DC circuit breaker can quickly interrupt the fault current and effectively isolate the fault,and it is one of the key equipment to ensure the reliable operation of the DC transmission and distribution network.However,the current DC circuit breaker still has problems such as limited breaking current capacity and high price.This paper proposes a novel DC circuit breaker topology with controlled active oscillation,expounds its topology composition,breaking and closing principles,and completes the mathematical analysis of parameter design and the study of the influence laws.A 10kV controlled active oscillation DC circuit breaker prototype is developed,and the bidirectional current breaking test of rated current and fault current is carried out,which verifies the correctness of the proposed topology design and the feasibility of engineering application.