Prediction of harmonic distortion and application of power-facto

Details Prediction of harmonic distortion and application of power-facto Prediction of harmonic distortion and application of power-facto

1999-04-06

2000-11-14

Sterrett, Jeffrey

Electricity: power supply or regulation systems

For reactive power control

Using impedance

G05F 170

Patent

active

061474754

ABSTRACT:
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.

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