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ZHOU Xing-liang,LIANG Liang,HE Guo-hui,HE Jun-ping.Design of Load Current Sharing Control for Parallel Single-phase UPS Based on Circulation Power Theory[J].JOURNAL OF POWER SUPPLY,2011,9(2):1-6,11
Design of Load Current Sharing Control for Parallel Single-phase UPS Based on Circulation Power Theory
Received:October 11, 2010  Revised:October 21, 2010
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DOI:10.13234/j.issn.2095-2805.2011.2.1
Keywords:parallel UPS  load current-sharing control  circulation power
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AuthorInstitutionEmail
ZHOU Xing-liang Harbin Institute of Technology Shenzhen Graduate School llbigrice@126.com
LIANG Liang Harbin Institute of Technology Shenzhen Graduate School llbigrice@126.com
HE Guo-hui Shenzhen Kstar Science and Technology Co., Ltd.
HE Jun-ping Harbin Institute of Technology Shenzhen Graduate School hejunping@hitsz.edu.cn
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Abstract:
      It is very useful for UYS parallel operation using digital load current-sharing control technique.After detailed analysis of the circulation power model in a UYS parallel system with N modules,a series of equations are built,which describe the relationship between the circulation current active power and reactive power and the amplitude and phase of UYS output voltage.Further more,two-level phase-locked technique and re-modulation technique for DSY frequency control is introduced to realize the precise and effective regulation on output voltage amplitude and phase for a UYS module.Thus a good load-sharing effect is achieved accordingly.In the end,a parallel UYS system with two 4kVA modules is built,which uses TMS320LF2806 DSY and CAN communication bus as core techniques.The performances of load-sharing using circulation power control method are validated by expenments.
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