Patent ID: 11936310
Assignee: DELTA ELECTRONICS (SHANGHAI) CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. The control method of the three-phase AC system according to claim 1, wherein when the three-phase AC system operates in a grid-connected mode, a harmonic current in an output current of the inverter is controlled, and the step 3 comprises:
performing coordinate transformation on the output current of the inverter to obtain a current signal, performing low-pass filtering on the current signal to obtain a fundamental current, and subtracting the fundamental current from the current signal to obtain the harmonic current; and
performing the coordinate transformation of multiple coordinate systems on the harmonic current to obtain the harmonic currents corresponding to the multiple coordinate systems, and setting a reference value of the harmonic current in each of the coordinate systems to zero to obtain the error signal in each of the coordinate systems.