Study On The Optimal Location Of Superconducting Magnetic Energy Storage (smes) Used For Improving The Transient Stability Of Power System

With the development of high-temperature superconducting wire and the continuous advancement of related low-temperature technology, the application of superconducting power equipment in power system has become the new hot spot of scientific researches in the field of power engineering. Superconducting Magnetic Energy Storage (SMES), a new kind of FACTS devices with good performance, is studied in this thesis, and the research topic of the thesis is the application and optimal location of SMES in power system.This paper first presents SMES and its application significance to power system, as well as its operation principle and performance characteristics, and further the structure and working principle of its each component are analyzed in detail.Based on the working processes of each part and the analysis of whole operation, the mathematic model of SMES for dynamic analysis and simulation in response to power flow is built.Then, the modeling and simulation analyses about the transient process of the infinite-bus system with SMES have been carried out in PSCAD/EMTDC. Simulation results show that SMES can effectively suppress the power-angle oscillation of system generator caused by disturbance, so as to enhance the transient stability of power system.Finally, for the sake of selecting the location of SMES in power system, simulation analysis and the comparison of the transient performances in a WSCC3 machine 9 bus system with different locations of SMES have been taken.According to the analysis and comparison of the simulation results, several conclusions have been made for the practical layout of SMES. For the complex multi-machine power system, this thesis analyzes the general principle and method of the installation location of SMES, such as the target of application, analysis method and choice of index. For the application of SMES used for improving the transient stability of power system, the analysis method of control index is studied. After listing the linear state equations of system, the detailed parameters of the control index are given, and then the implementation steps for the location of SMES in large complex power system are also proposed.