Active power line conditioner utilizing harmonic frequency injection for improved peak voltage regulation
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United States of America Patent
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Sep 20, 1994
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app pub date -
Aug 19, 1993
filing date -
Aug 19, 1993
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Abstract
The present invention provides an active power line conditioner (APLC) which has improved peak voltage regulation capability when compared with similarly-sized devices constructed according to current teachings. The invention utilizes a control function which, when the AC input voltage is not within a given sinusoidal regulation range of the APLC, superimposes selected harmonics of the fundamental frequency on the reference voltage signal used to control voltage regulation action. This causes the AC output voltage of the APLC to have a nonsinusoidal, but peaking waveform shape. The magnitude of the harmonics are preferably controlled to increase as the amount by which the AC input voltage falls outside the linear regulation range of the active power-line conditioner. In presently preferred embodiments, the chosen harmonic frequency is preferably an odd harmonic of the fundamental frequency, with third or fifth harmonics believed to be particularly useful. To Lessen the potential for unwanted zero crossings of the AC output voltage, means may be provided to modulate the harmonic reference with an envelope frequency equal to twice the fundamental frequency.
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