Synchronous reference frame based transformerless single phase grid tie inverter for DC bus power evacuation

Increase in renewable power generation increases the power penetration to grid. Inverter plays a major role in power penetration. In this paper transformer-less single phase grid tie inverter based on synchronous reference frame current control is proposed to supply active power (P) to grid. This current control provides infinite control gain and zero steady state error ideally. The plant transfer function of grid tie inverter is derived from the mathematical model and a proper compensator is designed to achieve a better transient response of the system. Transformer-less inverter provides high efficiency in real power transmission and low switching loss is achieved by Modified Unipolar Sinusoidal Pulse Width Modulation (MUSPWM).