| Abstract |
This paper proposes a new topology for a three-phase PV grid-tie converter. The Whole system consists of two-stage, high-frequency boost inverter cascaded by rectifier-inverter system. A single-phase high-frequency transformer is used to link both stages and provide galvanic isolation between the AC and DC sides. In the first stage, a new single-stage high-frequency boost inverter is proposed to boost and convert the DC output voltage of the PV array to a high-frequency single-phase square waveform and to realize maximum power point tracking (MPPT). The second stage is rectifier-inverter system that interfaces the first stage to three-phase grid connected. The 5kW three-phase grid connected proposed system has many features such as rising the inverter output voltage level, MPPT, galvanic isolation, small size, high reliability, and light weight. In addition, a grid side controller is used to inject a sinusoidal current into the grid at unity power factor. The proposed topology has been verified analytically by using PSIM software. |
