Substation Voltage And Reactive Power Integrated 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.