Research Of Controlling Solid-State Fault Current Limiter

As well known, the short circuit fault is one of the most dangerous and frequent faults in Power system. Once it happens, the short circuit current level will become very high within half a period. With the development of power systems, the short circuit capacity becomes a serious limiting factor to it. In order to minish the damage to the Power system, a protection system to limit the short circuit current to a safe level as quickly as possible is required. The traditional methods to limit the short current have many shortcomings. This paper is supported by Tianjin University 985 Foundation under the project of "Research and implement of a novel solid state fault current limiter ". Having read a lot of references, two novel circuit topologies of solid state current limiter have been developed. A fault current limiter with TCSC(Thyristor Controlled Switched Capacitor) is proposed, which works as TCSC when power system works normally, otherwise works as FCL(Fault Current Limiter). The conversion of different working modes is analyzed in this paper. The simulation of MATLAB proved that it is feasibility. The effect of FCL component values is also analyzed .the control way based on artificial neural network (ANN)is proposed, and is check by simulation using MATLAB. A novel bridge type solid state current limiter and a new control strategy is proposed. The characters and operating principle of a novel bridge solid-state current limiter have been developed in detail. Simulation based on MATLAB/SIMULINK is analyzed. In the end, this paper offers the design thinking about the hardware and the software in 80C196KC (a single chip computer).