Research On Emergency Partition Of Voltage/Reactive Power In Power System

With the rapid development of power industry and continuous extension of power system, the problem of voltage stability is becoming increasingly serious. The control partition and control policy for the voltage emergency are of great importance not only to voltage quality guarantee but also enhancing static voltage stability and avoiding voltage collapse incident.The main investigation problem about emergency partition is as follow: The relationship of voltage magnitude and static voltage stability margin is analyzed in details. Voltage magnitude within a specified margin does not imply voltage stability under heavy loads conditions. So, a new method of the emergency control partition considering voltage stability margin is given.In this dissertation, it is considered as an important objective of emergency control and emergency partition to enhance static voltage stability margin. Four indexes are synthetically considered in the method, which are the voltage sensitivity of control node, control margin, priority of the node and sensitivity of stability margin. The synthetic weight of four indexes is determined through the analytic hierarchy process.A new method is presented to combine four indexes into one. A concept named control distance is presented. based on the control distance, emergency partition centered around the fault node is completed.Through the example of IEEE39 and IEEE16 typical system,the availability of the discussed methods in this dissertation is approved.