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

Claim 0:
1. A control method 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, and the control method comprising:
step 1, receiving an output signal of the three-phase AC system, and obtaining a characteristic value of the output signal according to the output signal;
step 2, performing virtual synchronous generator control on the inverter according to the characteristic value to obtain a fundamental electric potential;
step 3, extracting a harmonic component in the output signal, and obtaining an error signal according to the harmonic component and a reference value of the harmonic component;
step 4, controlling the error signal to obtain a harmonic compensation electric potential;
step 5, obtaining a control electric potential by superimposing the harmonic compensation electric potential with the fundamental electric potential; and
step 6, obtaining a pulse signal by modulating the control electric potential, and obtaining a switching signal of the inverter according to the pulse signal.