基于PMOS的自取电直流固态断路器

Self-powered DC Solid-state Circuit Breakers Based on PMOS

相比传统机械式断路器,固态断路器(solid-state circuit breaker,SSCB)以其分断速度快、不产生电弧等优点,在直流电网中得以广泛关注。然而,固态断路器基于半导体开关器件,除功率电路外还需要额外的控制和驱动电路,这部分电路工作需要外接供电电源,提高了系统复杂程度,特别是在电网自身故障时,供电电源也可能不稳定,降低了固态断路器的可靠性。为此,提出了一种基于PMOS的自取电直流固态断路器,并分别通过仿真与实物样机证明了本固态断路器的可行性与有效性。实验结果表明,所提固态断路器在正常导通时,PMOS处于完全开通状态,不影响线路正常工作时的电压;在直流系统发生短路故障时,利用短路电流耦合能量在无需额外供电电源的前提下使得PMOS可靠关断,提升了系统的稳定性与可靠性,可以应用于直流微电网或者电池储能等场合,具有较好的应用前景。

Compared with traditional mechanical circuit breakers,solid-state circuit breaker(SSCB)has been widely no-ticed in the DC power grid for its fast-breaking speed and non-arcing advantages.However,solid-state circuit breakers are based on semiconductor switching devices,which require additional control and drive circuits in addition to the power circuit.The operation of this part of the circuit requires an external power supply,which increases the complexity of the system,especially,when the grid itself fails,the power supply may also be unstable,reducing the reliability of solid-state circuit breakers.To this end,a PMOS-based self-powered DC solid-state circuit breaker is proposed in this paper,and the feasibility and effectiveness of this solid-state circuit breaker are demonstrated by simulation and physical prototype,re-spectively.The experimental results show that the proposed solid-state circuit breaker is fully turned on during normal conduction,which does not affect the line voltage during normal operation;in case of short-circuit faults in the DC system,the short-circuit current coupling energy is used to enable the reliable turnon and turnoff of PMOS without additional power supply,which improves the stability and reliability of the system and can be applied to DC microgrids or small en-ergy storage systems.It has good application prospects.