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

Claim 15:
16. The control device for the three-phase AC system according to claim 12, 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 error obtaining unit comprises:
a harmonic current obtaining module configured to perform coordinate transformation on the output current of the inverter to obtain a current signal, perform low-pass filtering on the current signal to obtain a fundamental current, and subtract the fundamental current from the current signal to obtain the harmonic current; and
a current reference value setting module configured to perform the coordinate transformation of multiple coordinate systems on the harmonic current to obtain the harmonic currents corresponding to the multiple coordinate systems, and set 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.