Research And Design Of Solid-State Circuit Breaker And It's Control System Based On ETO

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 breaker (SSCB) based on power electronic switching devices are given widespread concern since the advent of them due to their outstanding performance of the switch current.Because of SSCB open-breaking speed, ETO usually complete in a few microseconds within the time frame breaking. SSCB has a high-speed switching characteristics and extremely convenient control, transient, high-frequency, low loss and high-security features, especially when used in power system can ensure that important customers rapidly switching power supply to limit closing current, etc, an effective solution to the impact of load to the impact of power system, improve the distribution network reliability and security. Moreover because there is no the switch fracture, fundamentally eliminated a series of questions which brings by the fracture electric arc, the non-contact, does not have the electric arc, so long as uses the appropriate its life is nearly "infinite".Emitter turn-off thyristor(ETO), which the United States George Institute of Technology Center for Power Electronic Systems developed in 2003, is the world's largest capacity of the MOS-controlled power electronic devices. It may be regard as the GTO improvement version, becomes by GTO and the MOSFET mix, therefore has already received the GTO high efficiency characteristic, also improved its switch ability and the control characteristic, satisfies the high performance electrical energy converter technique request of the new high efficiency electric power electronic device. The unit gain turn-off technology which realizes through the special structure improved the ETO turn-off characteristic greatly, raised the operating frequency, has increased the secure service scope, simultaneously it causes to change in the series-parallel connection use. In the near future, the ETO hopeful substitution thyristor and GTO will become in the high efficiency electric power electron application domain the mainstream component.Using emitter turn-off thyristor(ETO) production of solid-state circuit breakers, can solve the technical difficulties caused by solid-state switch which produces by other electric power electronic device, for example, average current, average voltage, on-state losses, dynamic overload and commutation. The good performance characteristic of ETO can effectively avoid or alleviate the above technical difficulty. The solid state circuit breaker based on the ETO is characteristic of their quick shutdown speed, strong ability to shutdown electric current, low on-state losses, and the simple structure, therefore, has the very broad application prospect in the electrical power system.The main work in this paper is as follows:1) In introduced that GTO and the power MOSFET switch characteristic foundation, has analyzed the ETO structure and the principle of work as well as the ETO equivalent circuit model. It can be concluded:ETO has gathered GTO and the power MOSFET merit, surpasses certainly other solid-state circuit breaker based on the ETO solid state circuit breaker performance.2) An overall design of a novel SSB was given out by analysis the application of SSCB, coupled with the analysis of main switch topology structure and control strategy, and detailed solid-state circuit breaker in the power quality control technology applications.3) The hardware and software design of intelligent control system was completed, and the hardware essential module and the software routine has been carried on the elaboration separately.