Heat Pump Power Quality: Harmonics and Power Factor

By Isabelle Heriakian / Published on Mon, 2009-11-23 16:16

Heat Pump Power Quality: Harmonics and Power Factor

by B. Hefferman, G; Love and N. Pahalawaththa.

Heat pumps are an increasingly significant load in the New Zealand power system. This paper details an investigation into the harmonics produced, and the reactive power drawn by six commercially available heat pumps. The investigation found a large variation in the harmonics produced by the different heat pumps; in one case, the harmonics produced exceeded the emission limits allowable in the applicable standard, AS/NZS 61000.3.2 [1]. The reactive draw of the heat pumps also varied by brand; ranging from slightly leading power factors to highly lagging power factors. In all cases the harmonic production and the power factor were highly dependent on both the ambient indoor and outdoor conditions, and whether the heat pumps were heating or cooling.

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