Discontinuous PWM in single-phase grid-connected inverter

Single-phase grid-connected inverter (GCI) is a kind of single-phase voltage source converter (VSC), and as the indispensable tie unit between different power supplies, it is widely used in the fields of wind generation and solar PV generation. In the paper, as first, on the basis of the concept of the discontinuous pulse-width modulation (DPWM) for three-phase VSI, a new DPWM of single-phase GCI is presented by means of zero-sequence component injection. Then, the transformation from stationary frame (abc) to rotating frame (dq) is designed after reconstructing the other orthogonal current by means of one order all-pass filter. Finally, the presented DPWM based single-phase GCI is established, analyzed and simulated by means of MATLAB/SIMULINK. The simulation results show the validation of the above modulation algorithms, and the DPWM based single-phase GCR has reduced power loss and increased efficiency.