直流断路器模拟试验回路的设计与仿真

Design and Simulation of Test Circuits of DC Circuit Breaker

目前针对实验室内测试换流式直流断路器的开断性能,多采用工频的合成回路进行试验,其等价性有待商榷。文中提出采用叠加振荡电流源来模拟实际直流短路电流的方案。针对设计参数为额定电流2 kA,短路电流20 kA,最大电流上升率6 kA/ms的直流系统,分别计算了低频、高频电流源回路及电压源回路的相关参数,通过PSCAD搭建了整体的系统模型,分析了各模块间的动作时序,并成功进行了开断试验,对实际直流断路器及其测试平台的设计有一定的参考价值。

At present,for the purpose of testing the breaking performance of commutated DC circuit breakers in the laboratory,power frequency synthetic test circuits are generally used,and the equivalence is to be discussed.This paper proposed a scheme for superimposing an oscillating current source to simulate an actual DC short-circuit current.For the DC system with design parameters of rated current 2 kA,short-circuit current 20 kA,and maximum current increase rate of 6 kA/ms,the relevant parameters of the low-frequency,high-frequency current source circuit and voltage source circuit were calculated respectively,and the overall system model was built by PSCAD.The time sequence of each module was analyzed,and the breaking test was successfully performed.It has certain reference value for the design of the actual DC circuit breaker and its test platform.