Research on Improving Transient Stability of Power System with Distributed BESS and its Coordinated Control Method

Abstract

The feasibility of battery energy storage system (BESS) in ameliorating power system transient stability has been proved. However, the required BESS capacity is large, which leads to high price. Meanwhile, the improving effect is significantly affected by fault location and BESS location. To address the problem, a distributed configuration of BESS, with a coordinated control method, is proposed in this paper. Firstly, an independent double-closed loop decoupling controller is designed for each BESS, so that the BESS unit can realize decentralized control according to its local correlation information. Secondly, particle swarm optimization is applied to optimize the control parameters of the distributed controllers to achieve coordinated control. Simulation results show that the distributed BESS controllers optimized by particle swarm optimization can better coordinate with each other, and the transient stability of the system is significantly improved.

A hierarchical optimization technique for placement of battery energy storage system to improve grid transient stability

“…The performance of BESSs in frequency regulation differs at various network locations 31 . Transient stability improvement is significantly affected by the BESS location in the power system 32 . As BESS performance is affected by its location in the power system, the optimal location of BESS in improving the transient frequency stability needs to be determined carefully.…”