A Self-commutated HVDC Circuit Breaker Based on Forced Zero Crossing Technology

A Self-commutated HVDC Circuit Breaker Based on Forced Zero Crossing Technology

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In order to improve the breaking capacity of Hybrid DC circuit breaker and reduce the harm of DC short circuit fault to the system, we click here proposed a self-commutated HVDC circuit breaker based on forced zero crossing technology.The circuit breaker replaces the IGBT components with thyristors and diodes, and realizes the cut-off of the faults on both sides of the circuit breaker through a single precharge capacitor and forced zero crossing technology, which reduces the installation cost of the circuit breaker.In this paper, the topological structure and working principle of the DC circuit breaker are described in detail, and the parameter selection method of the components is analyzed through the action sequence and the equivalent circuit.

Finally, the three-terminal ring network model is built by PSCAD simulation software and verified by color block iphone case simulation.The results show that the scheme can realize the reliable cut-off of the fault line, and the circuit breaker can recover the cut-off ability without recharging after one precharge, thus having good economy.