Kunming City, High Voltage Power Grid Static Security Analysis And Security Assessment

As the main component of power system,the downtown distribution network is one of the most important basic facilities for a modern city. It is crucially important for us to analyze the static security of downtown distribution network in order to maintain safe and smooth.As an important part of power system facing customers directly which has different structural and operational characteristics,the research about the effect of distrubtion network on its power supply security is just lunched outAnalyze the static security of downtown distribution network is discussed, Some deaper studies,such as power-flow calculation, network circuits formed analysis, anticipated accident analysis are detailed in section.and analyze the static security of Kunming downtown distribution, by power-flow calculation evaluate the voltage,phase angle,active power and reactive power for the network,so that we can judge whether the all voltage and current in the network excess their limits through N-1 analysis.At present time there is no one integrated model to evaluate the power supply security of the whole power system.a new method based on fuzzy theory is provided that correct remarks for power system's security can be given by making use of appropriate special function.In this dissertation,the Kunming downtown distribution system security is evaluated based on fuzzy theory according to the present condition of Kunming distribution system. Factors considered in this dissertation affectingth ecapability are including as follows: N-1 analysis, voltage offset, transformer load rate and feeder load rate, conclusion of the whole fuzzy distribution security is reached.