Design of Current Limiting Optimization Control System for High Voltage Direct Current Circuit Breaker Based on Particle Swarm Optimization

The HVDC (high voltage direct current) circuit breaker can isolate the fault line, so that the DC(direct current) power grid does not need to lock all converter stations when one line fails, and does not affect the normal operation of other lines. In order to improve the reliability and transmission capacity, and realize the interconnection of different regional networks, multi terminal HVDC transmission has become a research hotspot. In this paper, the influence of different capacitance values on the breaking time and the influence of different inductance values on the breaking time are simulated. On the whole, the DC breaking time decreases with the increase of capacitance, which is due to the decrease of oscillation frequency and increase of oscillation amplitude caused by the increase of capacitance. When the capacitance value is greater than 110, the local breaking time will increase. On the whole, the DC breaking time increases with the increase of inductance, which is due to the decrease of oscillation frequency and amplitude caused by the increase of inductance. Through the experimental comparison of the three algorithms, it can be clearly found that the PSO (particle swarm optimization) is in the optimal value. Based on the particle swarm optimization algorithm, the current limiting of HVDC circuit breakers is optimized, and the current limiting optimization control system of HVDC circuit breakers is established in this paper. The system reduces the SSO problem at the sending end of the additional control suppression of the instantaneous impulse voltage and current amplitude borne by power electronic devices into the minima optimization problem in the controller parameter design.