A novel control strategy for grid-interactive inverter in grid-connected and stand-alone modes

This paper proposed a control strategy for grid-interactive inverter operating in stand-alone and grid-connected modes. This control method has two outer loops and one inner loop. The principle of the control method and the design of the parameters are analyzed. Using this control strategy, seamless transfer can be achieved between the two modes, and the detailed process of the seamless transfer between two modes is illustrated. A 500 W dual buck half-bridge inverter is developed in stand-alone and grid-connected modes based on DSP control. The experimental results verify the analysis