Load flow based voltage stability indices to analyze voltage stability and voltage security of the power system

Abstract

Voltage Stability and Voltage Security are considered as important concerns in power system planning and operation. To provide reliable, secure and stable electrical power to the customers, is the main task of power system engineer. To meet these requirements simultaneously, the power system is to be operated closer to its stability limits which cause more stress on the power system. Therefore, a study that determines the maximum power transfer capability of the power system before voltage collapse must be carried out in the voltage secured environment. This paper presents the evaluation of some of load flow based static voltage stability indices which are found during the literature survey to present reliable information about the closeness of the power system to voltage collapse. The comparison of these indices is presented here and their effectiveness has been tested on various standard IEEE busbar test systems using several different scenarios of load increase. The results of standard IEEE14 busbar test system have been demonstrated specifically. The novelty of the work presented here lies in the method of load increase scenario using a special code written in MATLAB environment. Furthermore, a novel idea of the use of line voltage stability indices to predict voltage collapse within the framework of a voltage security is presented in this paper.