A new line voltage stability index (NLVSI) for voltage stability assessment

Abstract

Power system is probably one of the most complex dynamical systems. In these systems, active and reactive power demand is increasing day by day, other way it can be said that the stress on these systems is increasing. Under these stressed conditions, they are operating at the stability limits to meet their load demand. Due to the above scenario, voltage stability problem became a major issue. For stable operation of power systems, continuous monitoring of proximity of the voltage instability is necessary. This paper presents a New Line Voltage Stability Index (NLVSI) for detecting the proximity of voltage instability of the system. In this work, constant PQ and ZIP load models are considered to study the effectiveness of the proposed index. Experimentally determined ZIP coefficients are used for ZIP load models. The proposed work is demonstrated on standard IEEE 14 bus test system. The results are compared with some existing indices to validate its feasibility. All the simulations in this work are carried out through MATLAB.