Effect of load modeling on voltage stability

Abstract

This paper analyzes the analysis of the relation between the mechanism of voltage stability and load models. Two methods, IV (instrumental variable) and MSAR (minimium sum of the absolute residues), are used to identify load parameters of nonlinear and linear load model. ESA (eigenvalue-structure analysis) and two sensitivity methods based on ESA are presented to analyze the voltage stability: sensitivity on state variables or control variables and sensitivity of total generated reactive power. Examples are presented by simulation on the IEEE-14 bus system, which shows quantitative effects of different load models.