The traditional harmonic current detection algorithm is cumbersome and complex to implement in MCU. A practical single-phase ip-iq harmonic current detection algorithm is propo sed in the paper. According to the characteristics of single phase circuit instantaneous harmonic and reactive current,the algorithm decompose single-phase grid current based on instantaneous reactive power theory. The new algorithm has been applied as simulation and experimental example to a single phase PV inverter, and the results show that it is an real-time, sta ble, relia ble detection method which can meet the requirements of the single-phase active filter.
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