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자료유형
학술대회자료
저자정보
Chi Zhang (Aalborg University) Josep M. Guerrero (Aalborg University) Juan C. Vasquez (Aalborg University) Carsten Seniger (Leaneco A/S)
저널정보
전력전자학회 ICPE(ISPE)논문집 ICPE 2015-ECCE Asia
발행연도
2015.6
수록면
659 - 666 (8page)

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In this paper a control strategy for the parallel operation of three-phase inverters in a modular online uninterruptable power supply (UPS) system is proposed. The UPS system is composed of a number for DC/ACs with LC filter connected to the same AC critical bus and an AC/DC that forms the DC bus. The proposed control is designated in two layers, individual layer and recovery layer. In individual layer, virtual impedance concept is employed in order to achieve active power sharing while individual reactive power is calculated to modify output voltage phases to achieve reactive power sharing among different modules. Recovery layer is mainly responsible for guaranteeing synchronization capability with the utility and voltage recovery. With the proposed control, improved voltage transient performance can be achieved and also DC/AC modules are allowed to be plugged in and out flexibly while controlling the AC critical bus voltage. Detailed control architecture, regarding individual layer and recovery layer, are presented in this paper. Also an experimental setup was built to validate the proposed control approach under several scenarios-case study.

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Abstract
I. INTRODUCTION
II. PROPOSED CONTROL SCHEME FOR ONLINE MODULAR UPS SYSTEM
III. STABILTY ANALYSIS
IV. SIMUALTIONG RESULTS
V. EXPERIMENTAL RESULTS
VI. CONCLUSION
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