A Time Scale Separation Method for the Coordination of Voltage Controls for SVC and SVR

A time scale separation (TSS) method is proposed for the coordination of voltage controls of different time scales. The method is applied to a design of voltage regulator for static var compensator (SVC) which will be used with a step voltage regulator (SVR) in a distribution system. A simple filter, an input filter to the conventional SVC, is developed for the coordination with SVR controllers. The proposed filter can also be used as an input filter to AVR of the dispersed generators for the coordination controls with the conventional tap control devices. Effectiveness of the proposed method is demonstrated through numerical simulations in a distribution system having a large disturbance source of a wind power generator.