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The rotating high-frequency voltage injection is a method of the sensorless field oriented control of permanent magnet synchronous motor. But there are some problems in the traditional method, such as the phase shift brought by the low pass filters, and the position estimation error. The characteristic harmonic elimination method is introduced to replace the low pass filters, and the error brought...
Theory of the harmonic current generation of three-phase grid-connected inverter under unbalanced grid conditions is analyzed in detail in this paper. Based on the characteristic of three-phase currents, the structure of three adaptive notch filter(ANF) cells collaborating with fast positive and negative sequence decomposition(FPNSD) cell is proposed, which employs for the extraction of harmonic current...
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