换流站机械式直流断路器的无源化改造方法

A Passive Retrofit Method for Mechanical DC Circuit Breakers in Converter Station

针对机械式有源型直流断路器存在控制保护逻辑执行过程复杂、器件维护成本高的问题,提出一种换流站机械式直流断路器无源化改造方法,简化控制保护系统中与直流断路器相关的逻辑,取消辅助隔离开关和充电装置,不需要搭建电感器,由转移回路导线上的杂散电感提供所需的电感值,按照无源系统设计对电容器进行升级改造,不仅缩短了开关电流转化时间,减少了避雷器转换能量,同时提高了电容器的使用寿命,降低了直流断路器的故障率。最后,利用MATLAB/Simulink搭建了直流系统仿真平台,仿真结果与理论分析一致,进一步验证了所提直流断路器无源化改造方法的正确性和有效性。

To address the complexity of the control and protection logic execution process and the high cost of device maintenance in mechanical active DC circuit breakers,the paper proposes a design method for passive transformation of mechanical DC circuit breaker in converter stations,which simplifies the logic related to DC circuit breakers in the control and protection system,cancels auxiliary disconnecting switches and charging devices,eliminates the need to build a reactor,and provides the required inductance by the stray inductors on the transfer circuit conductor.The upgrading of capacitors in accordance with the passive system design not only shortens the switching current conversion time and reduces the surge arrester conversion energy,but also improves the service life of capacitors and greatly reduces the DC circuit breaker failure rate.Finally,a DC system simulation platform is built using MATLAB/Simulink,and the simulation results are consistent with the theoretical analysis,which further verifies the correctness and effectiveness of the proposed DC circuit breaker passive transformation scheme.