Comparison and Assessment of a Multiple Optimal Coordinated Design Based on PSS and the STATCOM Device for Damping Power System Oscillations

A.N Hussain,F Malek,M.A Rashid,L Mohamed

doi:10.19026/rjaset.7.528

Abstract

The aim of this study is to present a comprehensive comparison and assessment of the damping function improvement for the multiple damping stabilizers using the simultaneously coordinated design based on Power System Stabilizer (PSS) and Static synchronous Compensator (STATCOM). In electrical power system, the STATCOM device is used to support bus voltage by compensating reactive power; it is also capable of enhancing the stability of the power system by the adding a supplementary damping stabilizer to the internal AC or DC voltage control channel of the STATCOM inputs to serve as a Power Oscillation Damping (POD) controller. Simultaneous coordination can be performed in different ways. First, the dual-coordinated design between PSS and STATCOM AC-POD stabilizer or DC-POD stabilizer is used. Then, coordination between the AC and DC STATCOM-based POD stabilizers are arranged in a single STATCOM device without PSS. Second, the coordinated design has been extended to triple multiple stabilizers among PSS, the AC-based POD and the DC-based POD in a Single Machine Infinite Bus (SMIB). The parameters of the multiple stabilizers have been tuned in the coordinated design by using a Chaotic Particle Swarm Optimization (CPSO) algorithm that optimized the given eigenvalue-based objective function. The simulation results show that the dual-coordinated design provide satisfactory damping performance over the individual control responses. Furthermore, the-triple coordinated design has been shown to be more effective in damping oscillations than the dual damping stabilizers.

Highlights

Modern power systems are complex and frequently exhibit low-frequency, electromechanical oscillations due to inadequate damping caused by adverse operating conditions
To evaluate the performance of the proposed simultaneous coordinated designs, the responses with the proposed controllers were compared with the responses of the individual design controllers, Power System Stabilizer (PSS) and STATCOM
We focused on damping of lowfrequency oscillations via PSS and STATCOM-based Power Oscillation Damping (POD) applied independently and through the simultaneous dual-and triple-coordinated designs of the multiple damping controllers in a Single Machine Infinite Bus (SMIB) power system

Summary

Introduction

Modern power systems are complex and frequently exhibit low-frequency, electromechanical oscillations due to inadequate damping caused by adverse operating conditions. Low-Frequency Oscillations (LFO) can severely constrain the operation of a system and can decrease the security level of the power system (Abido, 2005; Mostafa et al, 2012). Over the past few decades, Power System Stabilizers (PSSs) have been used extensively for damping electromechanical oscillations in power systems (Furini et al, 2011). The damping effect of a PSS is valid only for small trips around the operating point. The use of PSSs alone may not provide adequate damping for the oscillations of a large power system (Abdel-Magid and Abido, 2004)

Objectives

Results

Conclusion