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

Claim 11:
12. A control device for a three-phase AC system, the three-phase AC system comprising an inverter and a filter unit, the inverter being coupled to a power grid and a load through the filter unit, the control device comprising:
a first calculation unit configured to receive an output signal of the three-phase AC system and obtain a characteristic value of the output signal according to the output signal;
a first control unit configured to perform virtual synchronous generator control on the inverter to obtain a fundamental electric potential;
an error obtaining unit configured to extract a harmonic component in the output signal and obtain an error signal according to the harmonic component and a reference value of the harmonic component;
an error regulation unit configured to control the error signal to obtain a harmonic compensation electric potential;
a second calculation unit configured to obtain a control electric potential by superimposing the harmonic compensation electric potential with the fundamental electric potential; and
a modulation unit configured to obtain a pulse signal by modulating the control electric potential, thereby obtaining a switching signal of the inverter according to the pulse signal.