The Short-circuit Current Limiting In The Power System Application

Along with the expanding power network, The fault current has increased greatly. It will bring hidden troubles to the security, stability, credibility of the power system, conventional current limiters gradually show their limitation and can't fit the request of high power quality. The fault current limiting technology has become a hotspot of fault protect research.solid states fault current limiting(SSFCL) technology is a new fault current limiting technology. The faculty in Zhejiang University have provided a novel bridge type solid state short circuit fault current limiter. It has many advantages: (1)The topologies is simple and it's easy to realize; (2) The control and application mode is flexible; (3) It has low wastage. So it is feasible to develop a well-performed fault current limiter. Now we are researching on engineering application of the novel solid state fault current limiting.First ,the paper expatiate on the importance and background of fault current limiting technology. It make an summary on some existing fault current limiting technologies and their advantages and disadvantages. Then the paper gives an novel solid state fault current limiter. It provides the main circuit topologies of single-phase and three-phase fault current limiter, and explains the principle of this FCL detailedly. After that the author analyzes the experimentation of the 380-voltage lab sample. Makes a summarization about the problems and resolvents in the experimentation. And give the result of the experimentation with diagram. Chapter 4 introduces the control system of the 10k-voltage novel solid states fault limiter. Discuss the design theory and the way of realization. At the end the author talk about some problems which should be considered in the application of FCL. The author also make a good expectation to the development of the novel solid state fault current Limiter.