Abstract
A device of bi-directional inverter adapts to convert electric power between a direct current micro-grid, a battery, and a local distribution network. The device of bi-directional inverter includes a bi-directional charger/discharger, a bi-directional inverter, and a switch circuit. The bi-directional charger/discharger is used to charge or discharge the battery. The switch circuit is used to couple the bi-directional inverter to the local distribution network or the battery. When the bi-directional inverter is coupled to the local distribution network, the bi-directional inverter operates in a local distribution network coupled mode or a rectification and power factor correction mode. When the bi-directional inverter is decoupled with the local distribution network, the bi-directional inverter is coupled to the battery for charging or discharging the battery. Accordingly, the device of bi-directional inverter could decrease the production cost of the direction current power system.