| Title |
Output Phase Synchronization Method of Inverter for Parallel Operation of Uninterruptible Power System |
| Authors |
Heui-Joo Kim ; Jong-Myeon Park ; Se-Hyung Oh |
| DOI |
10.6113/TKPE.2020.25.3.235 |
| Keywords |
Uninterruptible power system; Parallel UPS; Dual synchronization; B-sync PLL(Bus/Bypass Synchronization Phase Lock Loop); Image DQ transformation |
| Abstract |
In this paper, we propose the bus/bypass synchronization phase lock loop (B-Sync PLL) method using each phase voltage controller of a parallel UPS inverter. The B-Sync PLL included in each phase voltage control system of parallel UPS inverters has the transient response and the phase synchronization error at grid normal or blackout. The validity of this method is verified by simulation and experiment. As a result, the parallel UPS inverters using the proposed method confirmed that the output phase was continuously synchronized when a grid blackout, improving the transient response characteristics for stable load power supply and equal load sharing. |