Dynamic behaviour of static var compensator in large scale multi-machine system

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Dynamic behaviour of static var compensator in large scale multi-machine system


Author: Ho, Wing-yiu
Title: Dynamic behaviour of static var compensator in large scale multi-machine system
Degree: M.Sc.
Year: 1997
Subject: Electric power systems
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: v, 55 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1403351
URI: http://theses.lib.polyu.edu.hk/handle/200/3085
Abstract: Static Var compensator (SVC) is increasingly used in electrical power system to improve voltage regulation and reactive power conditions. Besides these functions, SVC can also be used in improving the dynamic stability of the system. As SVC is an active component, it will interact with other components such as generators in the power system. This paper describes the computer modelling of SVC using the Generalised Multi-machine Representation (GMR) technique and analyses the dynamic behaviour of SVC in a sample large scale multi-machine system. This paper concentrates on the effect of SVC on the dynamic stability performance of the system using small perturbation stability and eigenvalue analysis technique. The dominant mode of oscillation of the sample system without SVC is first analysed using modal analysis on the electrical power output of the generators in the system. SVC is then added in the system via different tests to analyse the effects. The effects of SVC in different locations of the system, with different control parameters such as control loop gain and using different damping signal inputs are analysed. The software developed in this study enables easy modelling of different control blocks, different parameters of control and static components of SVC. Any damping signal input from any component of the system can be selected. It is observed in the analysis based on the sample power system, real power feedback of tie line flow can be used as an effective damping signal. Damping signal gain has much greater effect on stability than SVC control loop gain. Damping signal of real power output of particular generator also have significant damping effect for particular mode of oscillation. Locating the SVC in different position of the system also affect the damping effect.

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