混合式直流断路器控制策略及实验验证.

Aiming at the problems of high loss and difficulty in control of existing current-limit hybrid DC circuit breaker,the working principle,short-circuit fault breaking and control protection strategy of a DC circuit breaker topology with small inductance structure in series with mechanical switch was studied.The topology of the new type current-limit hybrid DC circuit breaker was developed,and its prototype platform was built.The processing of different modules in the prototype was analyzed and introduced in detail.Finally,through a reasonable control strategy,some verification tests such as normal switch breaking and short-circuit breaking was done on the prototype.The results indicate that the new current-limit hybrid DC circuit breaker has excellent characteristics of accelerating the conduction of solid state switch in shortcircuit commutation and cutting of the short-circuit fault quickly and effectively,at the same time,it also reduces the complexity and difficulty in control of the circuit breaker,and has obvious technical and cost advantages. [ABSTRACT FROM AUTHOR]