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JING Lei,ZHANG Junfeng,QIU Maohang,LIU Bo,CHEN Min.Research on Control Technology and Current Distortion of Bidirectional AC/DC Converter Based on V2G[J].JOURNAL OF POWER SUPPLY,2018,16(2):45-50
Research on Control Technology and Current Distortion of Bidirectional AC/DC Converter Based on V2G
Received:November 23, 2017  Revised:March 02, 2018
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DOI:10.13234/j.issn.2095-2805.2018.2.45
Keywords:bidirectional AC/DC converter  V2G  unipolar modulation  current zero-crossing distortion
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JING Lei School of Electrical Engineering, Zhejiang University, Hangzhou , China
ZHANG Junfeng Electric Power Research Institute, Guangdong Power Grid Co., Ltd, Guangzhou , China
QIU Maohang School of Electrical Engineering, Zhejiang University, Hangzhou , China
LIU Bo School of Electrical Engineering, Zhejiang University, Hangzhou , China
CHEN Min School of Electrical Engineering, Zhejiang University, Hangzhou , China
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Abstract:
      With the development of smart grid and electric vehicle(EV) technology, the concept of vehicle-to-grid(V2G) has attracted more and more attention. Its core idea is the interaction between EVs and power grid, in which orderly charging and discharging of EVs is realized through scheduling, and the fluctuations brought by the connection of new energy power generation to power grid is alleviated. In this way, the operation of power grid is optimized. Bidirectional converter is a core device to realize the V2G technology, which not only needs to realize the bidirectional flow of energy but also needs to control the power quality of input and output, thus leading to higher control requirements for the converter. In this paper, the key control techniques of a bidirectional converter are analyzed and compared, and the control strategies of unipolar PWM modulation and average current control are selected for the bidirectional converter. Meanwhile, the problem of current zero-crossing distortion under unipolar modulation is theoretically analyzed, and an improved zero-crossing control strategy is proposed to solve this problem. At last, the validity and feasibility of the proposed method was proved through tests on a 3 kW bidirectional AC/DC converter platform.
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