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Grid-tied Power Conditioning System for Battery Energy Storage Composed of 2-stage DC-DC converter

2단 DC-DC 컨버터로 구성된 배터리 에너지저장용 계통연계형 전력변환장치

  • Received : 2012.07.18
  • Accepted : 2012.11.13
  • Published : 2012.12.01

Abstract

This paper proposes a new grid-tied power conditioning system for battery energy storage, which is composed of a 2-stage DC-DC converter and a PWM inverter. The 2-stage DC-DC converter is composed of an LLC resonant converter connected in cascade with a 2-quadrant hybrid-switching chopper. The LLC resonant converter operates in constant duty ratio, while the 2-quadrant hybrid-switching chopper operates in variable duty ratio for voltage regulation. The operation of proposed system was verified through theoretical analysis and computer simulations. Based on computer simulations, a hardware prototype was built and tested to confirm the technical feasibility of proposed system. The proposed system could have relatively higher efficiency and smaller size than the existing system.

Keywords

2-stage DC-DC converter;LLC resonant converter;2-quadrant hybrid-switching chopper;Power conditioning system;Battery energy storage;PLL(Phase-Locked Loop)

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