A Full Operating Condition Control Strategy of Thyristor Hybrid DC Circuit Breaker

The modeling and control of hybrid DC circuit breaker with the fast thyristor were researched. Overall considering the migration condition of fault current under different control strategies, a control strategy based on finite state machine method was proposed to implement the interconversion among different states. The realization process of pre-closing control and reclosing control was emphatically analyzed in detail and by means of fusing original temporal logic relation into the setting of different states thereby different events could be rapidly responded at any moment, and the repeated judgment and cross interference due to the fact that traditional time sequence control mode had to completely execute total control process could be avoided. Finally, a DC circuit breaker control system based on the state machine was built, and the status switching over of DC circuit breaker under different fault modes was simulated to verify reliable and fast operation among multi states under the control of finite state machine.