Patent ID: 11936238
Assignee: DELTA ELECTRONICS, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An uninterruptible power apparatus, coupled between a power grid and a load, the uninterruptible power apparatus comprising:
a bypass path, coupled to the power grid through a grid terminal, and coupled to the load through a load terminal, and configured to receive a first voltage through the grid terminal and transmit the first voltage to the load terminal, the bypass path comprising:
a switch unit, comprising a first thyristor and a second thyristor connected in anti-parallel,

a power conversion module, comprising:
an AC/DC conversion circuit, coupled to the grid terminal, and
a DC/AC conversion circuit, coupled to the AC/DC conversion circuit and the load terminal, and

a control module, coupled to the DC/AC conversion circuit,
wherein the time from when the control module detects the abnormality of the first voltage to when both the first thyristor and the second thyristor are turned off is a forced commutation period, and the control module turns off the first thyristor and the second thyristor by injecting a second voltage into the load terminal during the forced commutation period, so as to provide the second voltage as a reverse-biased voltage to the first thyristor or the second thyristor that are not turned off; during the forced commutation period, the control module calculates a magnetic flux offset amount based on an error amount between the second voltage and a voltage command, and provides a compensation command in response to the magnetic flux offset amount; the control module controls the DC/AC conversion circuit to provide a third voltage to the load terminal based on the compensation command and the voltage command.