Single-phase three-wire power control system and power control method therefor

摘要

The present disclosure provides a single-phase three-wire power control system integrating the electricity of a DC power supply device to an AC power source. The single-phase three-wire power control system comprises a single-phase three-wire inverter, a driving unit, a sampling unit and a processing unit. The single-phase three-wire inverter coupled between the DC power supply device and the AC power source converts a DC voltage of the DC power supply device to an output voltage. The driving unit is coupled to the single-phase three-wire inverter. The sampling unit samples the inductor current of an inductor of the single-phase three-wire inverter. The processing unit which is coupled to the driving unit and the sampling unit controls the single-phase three-wire inverter through the driving unit. The processing unit obtains the duty ratio according to the inductance of the inductor, the total variation of the inductor current, the DC voltage and the output voltage.

主权项

1. A single-phase three-wire power control system integrating the electricity of a DC power supply device to an AC power source through an inductor of a first power line, a second power line and a third power line, comprising:
a single-phase three-wire inverter, coupled between the DC power supply device and the AC power source, converting a DC voltage of the DC power supply device to an output voltage, wherein the single-phase three-wire inverter has a first half-bridge DC-AC power converter and a second half-bridge DC-AC power converter parallel-coupled to each other; a driving unit, coupled to the single-phase three-wire inverter; a sampling unit, coupled to the inductor, sampling an inductor current of the inductor; and a processing unit, coupled to the driving unit and the sampling unit, controlling the single-phase three-wire inverter through the driving unit, obtaining the duty ratio of a next cycle according to the inductance of the inductor, the total variation of the inductor current, the DC voltage and the output voltage; wherein the processing unit obtains a current variation of exciting the inductor and a current variation of demagnetizing the inductor according to the DC voltage of a present cycle, the output voltage, the inductance of the inductor and the duty ratio of the present cycle, and obtains the total variation of the inductor current in the present cycle according to the current variation of exciting the inductor and the current variation of the demagnetized inductor in the present cycle.