A three-phase boost-type grid-connected inverter based on synchronous reference frame control

In this paper, a synchronous reference frame (SRF) controlled three-phase boost-type grid-connected inverter with Current Space Vector Modulation (CSVM) is proposed for alternative energy sources regenerations. The averaged model of the equivalent boost-type inverter on SRF is derived in this paper. With the proposed averaged model, a SRF-PI compensator is analyzed with Bode diagram in frequency domain. Hence, the steady-state error tracking of the current can be effectively eliminated and power factor of the inverter can be well controlled under the decoupled d-q SRF control strategies. The feasibility of the proposed control scheme is verified by experimental results of a 700VA laboratory prototype.