To improve network operation level and to meet consumer’s requirement of voltage quality

automatic voltage control must be realized in the modern power network . This method is to calculate power network △U J optimized reactive voltage flow based on economic potential difference △U J conception. By means of concentrated control

dispersion control or both in combination

regional reactive balance

Optimization of the whole network operation voltage with lowest network loss are realized. To improve accuracy of △U J optmized reactive voltage flow adjustment

capacitor （Reactor）banks with smooth regulated output function are required in power network automatic voltage control.