Bidirectional inverter for new renewable energy storage system

摘要

A bidirectional inverter is provided for a renewable energy storage system which may simplify the circuitry and lower manufacturing cost by reducing the numbers of switches and control signals. The bidirectional inverter includes a pulse-width-modulation (PWM) signal provider for providing a PWM signal, a push-pull inverter coupled to the PWM signal provider and a direct current (DC) link, and an offset voltage provider coupled to the push-pull inverter and the electric power system. Accordingly, the bidirectional inverter converts DC power from the DC link into AC power or AC power from the electric power system into DC power.

主权项

1. A bidirectional inverter for a renewable energy storage system, the bidirectional inverter being configured to provide power from a direct current (DC) link to an electric power system or to provide power from the electric power system to the DC link, the bidirectional inverter comprising:
a pulse-width-modulation (PWM) signal provider for providing a PWM signal; a push-pull inverter coupled to the PWM signal provider and the DC link; and an offset voltage provider coupled to the push-pull inverter and the electric power system, and configured to level-shift an AC input voltage, and wherein the offset voltage provider is configured to provide an offset voltage to the electric power system, the offset voltage being a sum of a negative offset voltage and the AC input voltage, wherein the AC input voltage is an AC voltage from the push-pull inverter, and wherein the negative offset voltage level-shifts the AC voltage from the push-pull inverter in a negative direction by one half of the AC voltage.