| Title |
Bi-directional Photovoltaic Inverter with High Efficiency and Low Noise |
| Authors |
Sung-Ho Lee ; Jung-Min Kwon ; Bong-Hwan Kwon |
| DOI |
10.6113/TKPE/2012.17.6.539 |
| Keywords |
bi-directional inverter; transformer-less type inverter; leakage current; energy storage system |
| Abstract |
Due to merits cost and efficiency, the transformer-less type photovoltaic (PV) inverters have been popularized in the solar market. However, the leakage current flowing through a parasitic capacitor between PV array and ground can cause adverse effect in the transformer-less PV system. In this paper, a bi-directional PV inverter with high efficiency and low noise is proposed for the PV system with an energy storage device. The proposed inverter is a transformer-less type and performs the bi-directional power control between dc sources and grid with high efficiency. In addition, the proposed inverter can suppress the leakage current and obtain low noise characteristic. Finally, 3-kW prototype was implemented to confirm validity of the proposed inverter. |