ELECTRIC POWER CONVERTER WITH A VOLTAGE CONTROLLER AND A CURRENT CONTROLLER

摘要

An electric power converter for converting AC to DC power or DC to AC power is disclosed. The converter includes a circuit for controlling the voltage and the circuit for controlling the current separately. The voltage is controlled by the switching modules and the up-side controller using the calculated target voltage. The current is controlled by the current controller using the calculated target current.

主权项

1. An electric power converter which converts a DC power to an AC power and producing a sinusoidal AC voltage and sinusoidal AC current from an output terminal, comprising:
a reference voltage generator which generates a reference signal representing an AC voltage to which the DC power is to be converted; a voltage calculator which calculates, based on the reference signal, a target voltage to be produced between the first terminal and the output terminal; a voltage-side controller which controls the voltage between the first terminal and the output terminal to be equal to or nearly equal to the target voltage, whereby the voltage produced from the output terminal is a sinusoidal AC voltage; a current detector which detects a present current flowing through the output terminal; a current calculator which calculates, based on the target voltage and the present current, a target current to be flowing from the second terminal to the output terminal; and a current-side controller which controls the current flowing from the second terminal to the output terminal to be equal to or nearly equal to the target current.