Electrical transmission or interconnection systems – With harmonic filter or neutralizer
Patent
1996-03-01
1998-05-26
Elms, Richard T.
Electrical transmission or interconnection systems
With harmonic filter or neutralizer
333173, H02J 301
Patent
active
057570990
ABSTRACT:
A parallel hybrid active filter system for harmonic compensation of large non-linear loads is provided. The hybrid filter includes a passive filter connected in series with an inverter that is controlled to produce a dynamically variable inductance at selected harmonic frequencies. The passive filter may include passive capacitive and inductive elements, or may include a power factor correction capacitor alone, with all the inductance for the hybrid filter provided by the active filter inverter. The active filter inverter is controlled to provide the dynamically variable inductance by a synchronous reference frame (SRF) based controller that generates active filter inverter voltage commands that are fed to a PWM or square wave modulated voltage source inverter (VSI). The SRF controller includes an inductance command generator that generates the inductance value necessary to provide harmonic compensation from measured three phase load and filter currents transformed into a two phase synchronous rotating reference frame. A single inverter may be controlled to implement variable inductances for compensation of multiple harmonic frequencies by superposition of active filter inverter voltage commands from multiple SRF controllers. The active filter inverter is also preferably controlled by a SRF based DC bus controller to provide for maintenance of a DC bus voltage providing power to the inverter without affecting the harmonic compensation of the hybrid filter.
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Bhattacharya Subhashish
Cheng Po-Tai
Divan Deepakraj M.
Elms Richard T.
Wisconsin Alumni Research Foundation
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