A wide-area var-voltage control method for generators to improve short-term voltage stability

The short-term voltage stability of receiving-end power systems is attracting considerable attention. One of effective solutions to this issue is to provide adequate dynamic reactive power for the system. This paper puts forward a reactive power-voltage (var-voltage) control method based on the wide area measurement system (WAMS). The method can regulate the voltage reference value of generator excitation system in real time with the WAMS measurement results, so generators can output more dynamic reactive power to support transient voltage after large disturbance. The proposed control method involves a continuous closed-loop control in consideration of data transmission and processing time delay. Effectiveness of this method is verified by simulation of the actual power system.