The Research Of Instantaneous Harmonic Detecting Method And The Simulation Of The Active Power Filter

The harmonic pollute of the power distribution system is increasingly serious. The Active Power Filter(APF)is an effective harmonic damped. Traditional AC averaged power theory, instantaneous reactive power theory and the relative reactive and harmonic current detection methods are systematically studied. Then it is revealed that the reactive and harmonic current detection method based on the averaged power theory in the essence under the condition of mainline voltage and load current are both distorted.According to the ultimate goal of AC mainline reactive compensation and harmonic suppression ,annew optimized pulse modulation detection method forreactive and harmonic current based on the average powertheory is presented. The mathematical model of this method is established and the detection circuit realization is studied and the detection circuit realization is studied. Simulation results manifest that the proposed method is effect.