Research Of Voltage Stability And Reactive Power Control In Power System

Research of voltage stability and reactive power control in power system is an important issue in power system dispatching and planning. Reactive voltage control is a necessary measure to improve power system voltage stability and its economy, to ensure power quality and prevent voltage collapse. The text expatiate the content of power system voltage stability and reactive voltage control, laying stress on study of voltage control partition and reactive sources allocation.Based on the content of power system voltage stability and reactive voltage control, Using PSAT to analyse the exciter parameters of the generator influence on the dynamic voltage stability in power system. Voltage hierarchical control is a great formula to solve the problem of the modern complex power system, and its primary concern is to partition power system into several control areas. This text proposes a new method: partition the system at voltage stability critical point, define electric distance with euclidean distance, comprehensive consider influence of active and reactive power on the node voltage, and last use the improved dynamic partitioning method to solve the problem.Reactive sources allocation problem includes allocation site, number and capacity of reactive sources. An optimal allocation of reactive power sources using reactive compensation pilot buses approach on the basis of system partition. The author suggest a method to improve particle swarm optimization by introducing mutation operator of genetic algorithm and changing its particle initialization. And then to calculate compensation capacity of each allocation site with the improved particle swarm optimization. System partition reduces solution dimensions and promotes computing speed of the improved particle swarm optimization method. It is convenient to tackle the problem of reactive allocation and easy to find the global optimal solution. The example verifies the feasibility and effectiveness of the method.