Power system stabilizer tuning in multi machine electric power systems

Sayed Mojtaba Shirvani I Boroujen

doi:10.17485/ijst/2011/v4i12.4

Abstract

Power System Stabilizers (PSS) are used to generate supplementary damping control signals for the excitation system in order to damp the Low Frequency Oscillations (LFO) of the electric power system. The PSS is usually designed based on classical control approaches but this Conventional PSS (CPSS) has some problems. The CPSS is usually designed based on a linear model of the plant for a particular operating point. However, power systems are inherently nonlinear and the operating point frequently changes. Therefore, CPSS performance may deteriorate under variations that result from nonlinear and time-variant characteristics of the controlled plant. In this paper, to develop a highperformance PSS for a wide range of operating conditions, meta-heuristic optimization methods such as Particle Swarm Optimization (PSO) and Genetic Algorithms (GA) are used for tuning PSS parameters. The proposed optimization methods are evaluated against each other at a multi machine electric power system considering different loading conditions. The simulation results clearly indicate the effectiveness and validity of the proposed methods.

Highlights

Large electric power systems are complex nonlinear al., 2005)
In order to improve the performance of Conventional PSS (CPSS), systems and often exhibit low frequency numerous techniques have been proposed for designing electromechanical oscillations due to insufficient damping them, such as intelligent optimization methods
These oscillations with et al, 2007; Jiang et al, 2008; Sudha et al, 2009; Linda small magnitude and low frequency often persist for long & Nair, 2010; Mehdi Nikzad et al, 2011; Reza Hemmati periods of time and in some cases they even present et al, 2011;Sayed Mojtaba Shirvani Boroujeni et al, limitations on power transfer capability (Liu et al, 2005) In 2011; Shoorangiz Shams Shamsabad Farahani et al, analyzing and controlling the power system’s stability, two 2011a,b Yassami et al, 2010) and Fuzzy logic method distinct types of system oscillations are recognized

Summary

Introduction

In order to improve the performance of CPSSs, systems and often exhibit low frequency numerous techniques have been proposed for designing electromechanical oscillations due to insufficient damping them, such as intelligent optimization methods Such oscillations are referred to as “intra-area mode” application of robust control methods for designing PSS Power System Stabilizers (PSS) are used to stability enhancement of a multi machine power system generate supplementary control signals for the excitation using PSSs which their parameters are tuned using PSO

Results

Conclusion