Substation And Reactive Power Control

The control Principle and mathematic model of substation vol/var coordinated control is discussed.This paper designs a fuzzy control system used to control the vol/var of substation. According to the characteristic of nine-area diagram of substation vol/var coordinated control, this system gives the defination of fuzzy sets and the degree of membership of input/output variables, and designs corresponding control rules. The results of simulation demonstrate the system can satisfy the constrains of the day-adjusting times of the switching of on-load transformer and Paralleled compensation capacitors,and ensure voltage quality, reactive power basical balance. Considering the var requirement in different load time period and the control demand in load saltation, a improved control scheme is provided. The results of simulation show the improved scheme can meet the demand of vol/var in different load time period,protect the wrong operation when either voltage or reactive power appears saltation, and decrease the times of regulation of the switching of on-load transformer and paralleled compensation capacitors .Finally,a background software module of substation vol/var coordinated control is designed, based on the supervisory control and data acquisition system of substation.