Abstract

In order to meet the urgent needs of power grid dynamic harmonic detection and power metering, a harmonic power metering method based on Blackman-Nuttall window tri-spectral line is proposed to improve the spectrum leakage and sidelobe effect of dynamic harmonic FFT. A new three-phase harmonic power meter scheme based on ADS1178+TMS320C6745+K60 is proposed. The data acquisition circuit of multi-channel high sampling rate synchronous sampling ADC and the design of data processing circuit based on high performance floating-point TMS320C6745 are introduced in detail. The error correction method of dynamic harmonic energy metering based on Newton interpolation is also presented. The new three-phase harmonic energy meter developed on this basis has the following characteristics: the fundamental active power measurement error is less than 0.2%, the fundamental reactive power measurement error is less than 1%, the 2–21 harmonic voltage measurement error is less than 2%, the harmonic current measurement error is less than 5%, and the harmonic phase measurement error is less than 5 degrees, which meet the accuracy requirement of the A class harmonic measurement instruments according to GB/T-14549-93.

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