Patent ID: 9570970
Date: 2017-02-14
CPC Classifications: H02M,Y02B

Claim:
1. A system for controlling a grid connected inverter, the system comprising: a proportional-resonant controller for sinusoidal reference tracking of a reference grid current and for providing a high gain at a specific line frequency, said controller receiving said grid current; a first update law block for continuously providing updated controller coefficients for said controller, said first update law block receiving said grid current and a sinusoidal signal related to said line frequency, said first update law block adjusting said controller coefficients based on said grid current and said line frequency; a harmonic compensator block for removing current harmonics by providing high gains at harmonic frequencies of said specific line frequency; a second update law block for continuously providing compensator coefficients for said harmonic compensator block, said second update law block receiving said grid current and said line frequency, said second update law block adjusting said compensator coefficients based on said grid current and said line frequency; wherein outputs of said controller and said compensator are combined to produce a duty cycle signal for said inverter.