The Design And Simulation Of A Novel Intelligent Solid State Circuit Breaker Based On IGCT

With the in-depth development of modern industry, higher performance standards for electric power distribution system are continually presented by users, in particular for some novel electric power sensitive load which has the very sensitive dependence on the quality of reliability and controllability of transient power. In the existing distribution network, mechanical circuit breakers are used at a large-scale. However, mechanical circuit breakers can't meet the demand of rapid switch of current because of its operation accompanied with noise, electric arc and the longer response time for switch. On the other hand solid-state circuit breakers (SSB) based on power electronic switching devices are given widespread concern since the advent of them due to their outstanding performance of the switch current.In this paper, a novel design scheme on intelligent solid-state circuit breaker at 10kV level is presented based on IGCT projects of Shanxi Power Company. The main part of the circuit breaker is made up of the IGCT switch modules, gate drive module, protection module and powerful air-cooled device. The intelligent control system consists of digital processing subsystem and HCI subsystem. The main work in this paper is as follows:(1) IGCT functional simulation model was established by power electronics simulate software PSIM based on the analysis of IGCT switching characteristics, and key parameters were discussed in detail in the model whose validity is verified. (2) An overall design of a novel SSB was given out by analysis the application of SSB, coupled with the analysis of main switch topology structure and control strategy. The simulation results showed that the breaking parameters of SSB met the design requirements, and it can provide reliable protection for the normal operation of distribution network.(3) The hardware and software design of intelligent control system was completed. We discussed separately key hardware module and software programs in data processing subsystems and interactive subsystem, and analyzed theoretically critical algorithms.