Improving voltage stability margin using STATCOM-storage devices

Abstract

With the recent developments in energy storage systems (ESS), there is a global trend to harness the potential advantages of these devices to enhance the operation and control of power systems. In this paper, a study on optimal allocation of STATCOM accompanied by ESS to improve static voltage stability of power systems is carried out. A method for clustering the power system buses, from the voltage stability viewpoint, based on Modal Analysis (MA) is presented. Also, a novel method of combining continuation power flow (CPF), MA, and Particle Swarm Optimisation (PSO) is proposed to find the optimal locations, numbers, and operating power factors of STATCOM-ESS to achieve a desired level of voltage stability margin (VSM), and simultaneously improve the voltage profile of the system. The method is tested on IEEE 118-bus test system.