Patent ID: 6717465
Filing Date: 2004-04-06
Classification: H02J,Y02E

Abstract:
An active harmonic suppression equipment comprising:a serially connected capacitor/inductor set consisting of a reactive power compensation ac capacitor and a filter inductor; while an impedance thereof is in fundamental frequency, the serially connected capacitor/inductor set performs as a capacitor and has fundamental reactive compensating function; while the impedance thereof is in high frequency, the serially connected capacitor/inductor set performs as an inductor and has filtering function used to filter high frequency switching harmonic current; the serially connected capacitor/inductor set electrically connected to a power feeder; a C-R-C filter set connected to the power feeder and used to filter high frequency switching harmonic current; a dc capacitor bank performing as an energy storage element and providing a dc voltage; a power converter converting the dc voltage into a compensating voltage which is flowing through the serially connected capacitor/inductor set, and the C-R-C filter set to produce a compensating current which is injected into the power feeder to suppress harmonic currents generated by nonlinear loads, thereby adjusting a utility current to be approximated as a sine-wave; and a control circuit detecting the load current, the utility current, the output current of the power converter and the voltage of the dc capacitor to calculate a reference voltage of the power converter and signals which are used to drive the power converter.