An Effective Corrective Remedial Action Algorithm to Prevent Voltage Instability

The objective of this paper is to propose a fast and efficient corrective remedial action algorithm to prevent mid-term and long term voltage instability. In this method, voltage control areas (VCAs) are determined using electrical distance based partitioning algorithm and an improved line stability index has been proposed to assess the stability status of VCAs. Since those line stability indices proposed in the literature cannot assess the stability in real power systems (which have more than two buses), in this paper, an improved line stability index is proposed which can accurately determine the voltage stability stiffness. Then, considering the stability status of VCAs, a simple and effective corrective remedial action will be proposed to inhibit voltage instability. The performance of the proposed approach has been validated through several scenarios which are performed using DIgSILENT PowerFactory software in IEEE 39-bus test system.