The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Output Phase Synchronization Method of Inverter for Parallel Operation of Uninterruptible Power System

무정전전원장치 병렬운전을 위한 인버터의 출력 위상 동기화 방법

  • Kim, Heui-Joo (Research Institute, Seoul Electric Power System Co., Ltd.) ;
  • Park, Jong-Myeon (Research Institute, Seoul Electric Power System Co., Ltd.) ;
  • Oh, Se-Hyung (Research Institute, Seoul Electric Power System Co., Ltd.)
  • Received : 2020.02.18
  • Accepted : 2020.04.27
  • Published : 2020.06.20
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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.

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References

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