H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 3/01 (2006.01) G01R 23/20 (2006.01) H02J 3/18 (2006.01)
Patent
CA 2268507
In a method for predicting harmonic-distortion values for the application of a desired step change of capacitance to an AC system, an initial step change is applied and, from this change, a value of harmonic impedance of the system for each of a number of harmonics is determined. From these harmonic-impedance values corresponding values of damping resistance are, in turn, determined and, using the determined harmonic- impedance and damping-resistance values, corresponding values of an electrical load parameter, preferably load voltage, are determined for the desired step capacitance change. The method is conveniently extended to cover a method and apparatus for applying power- factor correction capacitance, in which the load-voltage values for the various harmonics are evaluated to see if they represent a potential resonance condition and, if so, a step change other than the desired change is applied. Where no resonance is indicated, the originally intended step change is applied.
Alstom Uk Ltd.
Areva T&d Uk Ltd.
Fetherstonhaugh & Co.
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