Stability Analysis of the Automatic Voltage Regulation System with PI Controller

Abstract

The system voltage is one of the most important parameters, which determines the power quality. The stability of the system voltage is critical for the power system. This paper investigates the stability analysis of the automatic voltage regulation (AVR) system controlled by a PI controller related to the controller gains. For this purpose, a graphical-based technique called as the stability boundary locus method is proposed in the paper to obtain the stable parameters space of PI controller gains. Stability of closed region computed on parameters space determines from roots of characteristic equation of AVR system. The time-domain simulations are performed in Matlab/Simulink environment to validate the theoretical results.

Keywords

• Automatic voltage regulation
• Stability boundary locus
• Stable parameters space
• Electric power system