Power regeneration device and power conversion device

摘要

A power regeneration device according to an aspect of embodiments includes a voltage detecting unit, a signal processing unit, a phase detecting unit, and a power conversion unit. The signal processing unit generates, by using self-oscillation when the output of an AC detection signal from the voltage detecting unit is stopped due to a power outage, an AC signal whose frequency is the same as that of and whose phase is continued to that of the AC detection signal just before the stop. The phase detecting unit detects the phase of the AC power supply on the basis of the AC signal from the signal processing unit when power is recovered from the power outage.

主权项

1. A power regeneration device comprising:
a voltage detecting unit that detects an AC voltage from an AC power supply and outputs an AC detection signal according to the AC voltage; a signal processing unit that generates, by using self-oscillation when an output of the AC detection signal from the voltage detecting unit is stopped due to a power outage, an AC signal whose frequency is a same as that of and whose phase is continued to that of the AC detection signal just before the stop; a phase detecting unit that detects a phase of the AC power supply on the basis of the AC signal when power is recovered from the power outage; and a power conversion unit that converts DC power into AC power and regenerates the AC power to the AC power supply.