Abstract
Interharmonics present in voltage/current signals affect the measurement accuracy of power quantities defined in standard IEEE 1459. In this paper, the measurement errors caused by the measurement time intervals not satisfying integral multiple periods of interharmonics are discussed. First, the mathematical models of power quantities between arbitrary frequency components are constructed. Next, four parameters that affect the power measurement accuracy are summarized, which are interharmonic frequency, measurement start time, voltage/current initial phase angle, and the length of measurement time intervals. The simulation results and corresponding analysis show the effects of each parameter on measurement accuracy. In conclusion, the maximum errors are always caused by interharmonics within particular frequency range which relates to the length of measurement time interval. Moreover, the relative errors of power quantities can be restricted within 1%, by using a time interval of 3 s, even if under the condition of selecting the worst measurement start time.
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