An Adaptive Control Scheme for Three-phase Grid-Connected Inverters in Photovoltaic Power Generation Systems

Control of the three-phase photovoltaic (PV) inverters has drawn increasing attention in recent years due to the development of solar energy technology. This paper studies the control problem of the three-phase PV grid-connected inverters. In particular, an adaptive control method is adopted to deal with system uncertainties in such a problem. In this research, the state-space model of the inverter system, which considers the uncertainties of system parameters and eliminates the disturbance influence from the grid side, is established. Compared with a classical fixed-gain control method, the adaptive control method is capable of efficiently handling system uncertainties and dealing with some unknown disturbances.