The design of constant frequency hysteresis current controller with voltage space vector in PV grid-connected inverter

A new constant-frequency hysteresis current control algorithm for PV grid-connected inverter is proposed, in which the complex plane is divided into six sectors based on line voltage space vector of electric power grid, and two-phase switches are decoupled respectively in every sector to control corresponding line currents, and the hysteresis band is modified by prediction, so that the output current waveforms can be improved, and the control is more accurate. The simulation proves the validity and feasibility of the proposed algorithm.