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WANG Xiaojun,SHI Keyan,DONG Dezhi,XU Dehong.Analysis and Design of Harmonic Suppression Loop in UPS Inverter[J].JOURNAL OF POWER SUPPLY,2018,16(3):113-119
Analysis and Design of Harmonic Suppression Loop in UPS Inverter
Received:February 11, 2017  Revised:April 06, 2017
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DOI:10.13234/j.issn.2095-2805.2018.3.113
Keywords:harmonic suppression  uninterruptible power supply  inverter  modeling  parameter design  decoupling control
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
           
AuthorInstitutionEmail
WANG Xiaojun College of Electrical Engineering, Zhejiang University, Hangzhou , China
SHI Keyan College of Electrical Engineering, Zhejiang University, Hangzhou , China
DONG Dezhi College of Electrical Engineering, Zhejiang University, Hangzhou , China
XU Dehong College of Electrical Engineering, Zhejiang University, Hangzhou , China xdh@zju.edu.cn
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Abstract:
      Under non-linear load with large crest factor current, the total harmonic distortion(THD) of uninterrupti-ble power supply(UPS) inverter output voltage is difficult to meet the regulation requirement. The harmonic suppression method based on dq0 synchronous rotating frame can eliminate the harmonics of specified order, thereby improving the THD of the UPS output voltage. In this paper, the structure of harmonic suppression loop was introduced, with which the harmonic suppression method was applied to a three-phase four-wire UPS inverter; the control equation for the harmonic suppression loop in dq0 synchronous rotating frame was deduced, thus the loop's dynamic model was obtained. On this basis, the structure of the harmonic suppression loop was improved to realize dq axes decoupling at low frequency, and the loop control parameters were also designed. Finally, the validity of the design of harmonic suppression loop was experimentally verified on a three-phase four-wire T-type three-level inverter platform.
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