Research on Deadbeat Control of a Three-level Grid- connected Inverter Based on αβ Transform

In distributed grid-connected power system, the control strategy of grid-inverter influences the quality of its output power. An improved method based on α-β transformation of deadbeat control algorithm is proposed for a three-level photovoltaic grid-connected inverter. This new control method overcomes the shortcoming of complicated dynamic phase angle compensation and is easily to combine with SVPWM strategy to realize a fast control of inverter grid- connected power. The paper firstly established the control model of a three-level inverter grid-connected system and subsequently proposed the computation method of forecasted link of voltage and current. A MATLAB simulation model is built up. Simulation and experiment results indicate that this new control algorithm simplifies the control and a good static and dynamic performance is achieved.