APPARATUS FOR CONTROLLING GRID-CONNECTED INVERTER

摘要

An apparatus for controlling a grid-connected inverter is disclosed. The apparatus according to an exemplary embodiment of the present disclosure is configured to promote an increase in efficiency of grid-connected inverter system and to improve a current THD by generating a voltage command by changing an offset voltage in response to size of DC-link power voltage and size of apparent power.

主权项

1. An apparatus for controlling a grid-connected inverter including a DC link capacitor receiving a voltage inputted from a DC power source, and a switching unit comprised of a plurality of power semiconductors, the apparatus comprising:
a first determinator configured to determining an active power and reactive power from an output voltage and an output current from the inverter; a power controller generating a current command using an active power command and an reactive power command, and the active power and the reactive power determined by the first determinator; a current controller generating a voltage to be synthesized by the inverter from the current command; a voltage generating unit generating a voltage command to be applied to the inverter from a voltage received from the current controller; and a controller generating a PWM (Pulse Width Modulation) signal to control the switching unit of the inverter using the voltage command.