I_p-i_q harmonic current detection method based on standard sine wave

Due to the inaccuracy of harmonic current detection in harmonic suppression,the ip-iq harmonic current detection method based on the standard sine wave is proposed.The method,which is the basis of instantaneous power theory,introduces the standard sine wave to constitute the C matrix in the traditional ip-iq harmonic current detection method.The standard sine wave is generated by inputting the two parameters of frequency f and initial phase of the fundamental positive sequence component into the function generator.Because the frequency of the standard sine wave is very stable,the fundamental and harmonic current detection is thusly very accurate.The model is also constructed and simulated;the results show that this method can greatly improve the detection accuracy of the fundamental current and harmonic current.