Research On Optimal Allocation And Sizing Of Dynamic Var Source-Model And Algorithm

East-west electricity transmission and region interconnection is China’s fundamental energy development strategy. As load-centres ("Yangtze River Delta" and "Pearl River Delta" etc.) became typical power receiver systems, transient voltage instability go severely for the lack of generator and large proportion of motor load, which will bring a large reactive power gap between demand and supply after faults were generated.Led by SVC, FACTS devices could inject reactive power to system instantly and support voltage. However, FACTS devices is expensive at present, meanwhile location and capacity are also of much concerned. That raises the question of how to allocate the FACTS devices.This thesis devotes to develop and improve new generation theory of dynamic reactive power optimization as important preventive control means for voltage stability problem. Mainly, it obtains following achievements.(1) To solve voltage instability problem seperately,a multi-location dynamic var allocative method based on voltage area partition-trajectory sensitivity index was put forward. Firstly,electronical distance was taken into consideration for voltage area partition,then the best location was appear at the top of the ranking list of trajectory sensitivity index for a certain zone.(2) For the long simulation time and ambiguous parameters setting strategy of TSI, three improvments including reducing nodes and faults taken into consideration, simplify the parameters was go forward.(3) This paper also present a strategy considering transient voltage stability for contingencies screening in order to retrench the contingency set and reduce simulation time.(4) A configuration algorithm based on genetic algorithm for dynamic reactive power capacity planning was present.To minimize the investment meanwhile kept the system strong enough for presupposed faults,the algorithm could made a balance for transient voltage stability and economical efficiency.(5) transient voltage stability of IEEE39 system was taken into analysis. And the method present above was used and being proved to be effective.