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A new method for harmonic detection based on instantaneous reactive power theory

  • 2013-09-22
  • 43.03KB
  • Points it Requires : 1

  From the theory of instantaneous reactive power, it can be known that the active current i P (reactive current iQ) obtained by transforming the three-phase symmetrical current of the three-phase three-wire power grid into the α-β coordinate only contains 3n harmonics (n is an integer). Based on this, a new low-pass digital filter is designed. The filter has a linear phase finite impulse response (FIR) digital filter with an order of N/3 (N is the number of sampling points in a cycle), which can make the DC component of i P (iQ) pass without attenuation, while the amplitude at the 3n harmonic is attenuated to 0. The digital filter can realize the real-time and accurate extraction of the harmonic current of the power grid. Experimental simulation proves that it not only retains the accuracy of the digital filter, but also overcomes the long-standing problem of poor followability of the digital filter, and has high practical value.

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