全固态直流断路器在多电飞机配电环网中的应用OA

With the development of more electric aircraft(MEA)architecture,the demand for high reliability,fast fault isolation and intelligent control of DC distribution system is becoming more and more urgent.A solid-state circuit breaker(SSCB)based on anti-parallel insulated gate bipolar transistor(IGBT)is proposed for the MEA 270 V DC ring-type distribution network,which integrates bi-directional energy absorption and communication functions.After theoretical analysis and experimental verification,the parameters of the RC buffer circuit are optimized to balance the shutdown speed and over-voltage suppression capability,and the metal oxide varistors(MOV)are combined to achieve efficient energy dissipation.The prototype testing results show that,under 200 A short-circuit fault,the SSCB shutdown time is only 1.86 ms,the peak bus current is 382 A,and the peak over-voltage is controlled at around 410 V,which is significantly better than the traditional mechanical circuit breaker.The CAN bus communication module is designed to realize bidirectional data interaction between the circuit breaker and the host computer.The prototype experimental results show that the proposed scheme features fast breaking,low voltage stress and intelligent management,which can provide a technical reference for the protection of MEA DC distribution systems.