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GENG Yuting,LI Shan,LI Wuhua,HE Xiangning,CAO Fengwen.Improved Discontinuous Pulse Width Modulation Strategy for Wind Power Converters[J].JOURNAL OF POWER SUPPLY,2018,16(2):18-24
Improved Discontinuous Pulse Width Modulation Strategy for Wind Power Converters
Received:November 30, 2017  Revised:January 15, 2018
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DOI:10.13234/j.issn.2095-2805.2018.2.18
Keywords:DC microgrid  wind power converter  discontinuous pulse width modulation(DPWM)
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
              
AuthorInstitutionEmail
GENG Yuting College of Electrical Engineering, Zhejiang University, Hangzhou , China
LI Shan No. 704 Research Institute, China Shipbuilding Industry Corporation, Shanghai , China
LI Wuhua College of Electrical Engineering, Zhejiang University, Hangzhou , China woohualee@zju.edu.cn
HE Xiangning College of Electrical Engineering, Zhejiang University, Hangzhou , China
CAO Fengwen School of Electronics and Information Engineering, Suzhou Vocational University, Suzhou , China
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Abstract:
      For a high-power wind power converter, there is a contradiction between switching loss and the total harmonic distortion(THD) of current. How to optimize its modulation mode and thus improve the system efficiency and reduce the current harmonics is one of the core technologies of high-power wind power converter system. Considering the characteristics of wind power converters' wide operating ranges of frequency and voltage, the loss and harmonic performance of direct-drive wind power converters under discontinuous pulse width modulation(DPWM) strategy is studied. It is found that the main indicators are different under different operating conditions:at light loads,the power quality is poor and the switching losses are small; at heavy loads,the power quality is good and the switching losses are large. However, common modulation methods are difficult to strike a balance between THD and switching losses. To solve this problem, a novel DPWM strategy is proposed for the direct-drive wind power converters of permanent magnet synchronous machines.Under this modulation strategy, the switching losses and optimal characteristics of THD vary with the operating range of the converter, which realizes the optimization of main indicators under different operating conditions. Finally, through an experimental platform, it was verified that the proposed scheme was effective to reduce the switching loss at heavy loads and reduce the current harmonics at light loads.
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