Reactive voltage control model and method considering partitioned dynamic reactive power reserve

Since the existing algorithms of automatic reactive voltage control cannot effectively improve system voltage stability,an optimal reactive voltage control model with the dynamic reactive power reserve of voltage control partition as the measurement of system voltage stability is built. The effective reactive power reserve is obtained by calculating the voltage-reactive power curve of key nodes for each partition,the maximum variation of reactive power output in fault condition is taken as the minimum reactive power reserve for each area,and the partitioned dynamic reactive power reserve is introduced into the optimal model as its objective function and constraint to ensure the voltage stability margin,lower the system active power loss and control the voltage. The simulative results of IEEE 118-bus system and the application in an automatic voltage control system of a real grid show that,the proposed model and method are effective.