Improvement of Transient Stability and Short‐Term Voltage Stability by Rapid Control of Batteries on EHV Network in Power Systems

Abstract

SUMMARYThis research aims at development of new emergency control schemes using FACTS (flexible ac transmission systems) devices and BESS (battery energy storage systems) for prevention of cascading outages in bulk power systems. In this paper, the use of BESS is studied for the improvement of short‐term voltage stability from the viewpoint of voltage control. Based on the stabilizing control method proposed in our previous research to improve transient stability, a new control scheme is developed taking into account the finding that short‐term voltage stability is closely related to angle stability. An additional control system that limits active and reactive power absorption from the grid is applied to the stabilizing control system since the electrical power absorption drops the system voltages. Numerical simulations are conducted on two test systems with BESS to demonstrate the effectiveness of the proposed method for the improvement of both transient stability and short‐term voltage stability in severe fault cases such as a grounding fault and a generator trip. The results show the high potential of BESS for stability enhancement.