EVALUATION OF VOLTAGE STABILITY DYNAMIC LOADING MARGIN CONSIDERING THE EFFECT OF LOAD MODELS, EXCITATION SYSTEM PARAMETERS AND REACTIVE POWER GENERATION LIMITS OF GENERATORS WITH A COMBINATION METHOD

Amjady,; Velayati,

doi:10.22075/jme.2017.1552

EVALUATION OF VOLTAGE STABILITY DYNAMIC LOADING MARGIN CONSIDERING THE EFFECT OF LOAD MODELS, EXCITATION SYSTEM PARAMETERS AND REACTIVE POWER GENERATION LIMITS OF GENERATORS WITH A COMBINATION METHOD

Authors

Nima Amjady

mohammad hossein velayati

10.22075/jme.2017.1552

Abstract

Nowadays, Voltage stability is an important types of power system stabilities. To analysis of voltage stability, different static and dynamic boundaries such as maximum Loadability point (MLP) and bifurcation points such as saddle node bifurcation (SNB), hopf bifurcation (HB) and limit induced bifurcation (LIB) are introduced. Bifurcation theory that is based on the eigenvalue analysis is an effective method to evaluation of voltage stability and its boundaries. Moreover, load models, over-excitation limits of generators and auto-regulator of transformers will affect voltage stability. Therefore, in this paper, the Hopf bifurcation boundary of voltage stability feasible region is analyzed by combination of time domain simulation (TDS), bifurcation theory and modal analysis of dynamic Jacobian matrix of power system. Effect of different load models, reactive power generation limits of generators and excitation system parameters on voltage stability dynamic loading margin (especially HB) is evaluated.

Keywords

Voltage Stability

Bifurcation Theory

Differential-Algebraic Jacobian

Load Flow Jacobian

Eigenvalue