Research On AC Solid State Power Controller

Solid state power controller (SSPC) is a solid state device which is used to replace the relay's role of switching and the breaker's role of protection. It's a switch matching with solid state distribution system. SSPC has the advantages of no electronic contact, no electronic arc, no noise, reacting quickly, small EMI, long life, high reliability and being controlled long-distance by computers easily.As the switch of SSPC, TRIAC and Power MOSFET have their own advantages and disadvantages. Through analysis and comparison, Power MOSFET is chosen to be the switch of SSPC. There are three configurations with Power MOSFET, they are full-wave, anti-series and anti-parallel configuration, and by comparing the anti-series is chosen to be the object of research finally. Two methods can be used to control anti-series configuration, they are switching simultaneously and switching according to certain priorities. Circuits are designed and simulated independently and the method of switching simultaneously are chosen to be as the the issue of this paper finally.According the programme above, controlling circuits of AC Solid-State Power Controller are designed such as circuit of detecting the zero crossing, circuits of zero voltage turn-on, zero current turn-off, phase compensation, over-current protection of inverse-time, snubber circuit and so on. Finally a prototype is fabricated and tested, and acquire good performance.Based on single phase solid-state power controller, the design of three-phase SSPC is discussed and the experimental verification is carried on.When three-phase sspc switches, the three-phase load will lack phase in short time, the infection is also analyzed in this article.