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

Claim 17:
18. The control device of the three-phase AC system according to claim 12, wherein when the three-phase AC system operates in an off-grid mode, a harmonic voltage in an output voltage of the inverter is controlled, and the error obtaining unit comprises:
a harmonic voltage obtaining module configured to perform coordinate transformation on the output voltage of the three-phase AC system to obtain a voltage signal, perform low-pass filtering on the voltage signal to obtain a fundamental voltage, and subtract the fundamental voltage from the voltage signal to obtain the harmonic voltage; and
a voltage reference value setting module configured to set a reference value of the harmonic voltage to zero to obtain the error signal.