Consideration of harmonic resonance in office building electrical systems due to power factor correction capacitors

Pao Yue-kong Library Electronic Theses Database

Consideration of harmonic resonance in office building electrical systems due to power factor correction capacitors

 

Author: Lau, Tin-hung Rainbow
Title: Consideration of harmonic resonance in office building electrical systems due to power factor correction capacitors
Degree: M.Sc.
Year: 1999
Subject: Electric power systems -- China -- Hong Kong
Office buildings -- China -- Hong Kong
Harmonics (Electric waves)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: xiv, 231 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1485248
URI: http://theses.lib.polyu.edu.hk/handle/200/234
Abstract: In view of the increasing reports of components and equipment failures in local office buildings suspected to be caused by harmonics, this dissertation investigates the features of local office buildings in relation to harmonic problems. Intensive study is focused on the problem of harmonic resonance and performance of capacitor banks in office buildings. This dissertation begins with finding out the special features of local office buildings and the typical harmonic sources located therein. Two recorded harmonic problems in local office buildings are presented. International standards and development of harmonic standards in Hong Kong are reviewed. Capacitor performance in harmonic conditions are discussed. The detailed theories of reactive power compensation in linear and non-linear loads are presented. Optimum power factor of non-linear circuits compensated by capacitor banks is explained. The failure mechanism of capacitor units in harmonic and overloading conditions are explained. Contemporary power factor controllers which switch capacitor banks from and to electrical systems are also reviewed. To enable preliminary checking of harmonic flow patterns and harmonic resonance in electrical systems with non-linear loads and capacitor banks, a modelling technique with use of spreadsheet for execution is introduced. The modelling is based on the theory of three-phase balanced circuit. Theories of harmonic resonance and representation of system components by mathematical models are explained. Technique of detuned capacitor banks as a method to solve harmonic resonance in electrical systems is further presented. Numerical examples are used to illustrate the theories. The proposed modelling technique is then applied on a real office building to check for the possible harmonic effects on capacitor banks and the supply source. Design strategies in relation to harmonic problems in local high rise office buildings are finally outlined.

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