电源学报2018，Vol.16Issue(2)：18-24,7.DOI:10.13234/j.issn.2095-2805.2018.2.18
风电变流器改进型断续脉宽调制策略
Improved Discontinuous Pulse Width Modulation Strategy for Wind Power Converters
摘要
Abstract
For a high-power wind power converter,there is a contradiction between switching loss and the total har-monic 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 charac-teristics 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 switch-ing losses are small;at heavy loads,the power quality is good and the switching losses are large.However,common modula-tion 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 mod-ulation 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.关键词
直流微网/风电变流器/断续脉宽调制Key words
DC microgrid/wind power converter/discontinuous pulse width modulation(DPWM)分类
信息技术与安全科学引用本文复制引用
耿毓廷,李姗,李武华,何湘宁,曹丰文..风电变流器改进型断续脉宽调制策略[J].电源学报,2018,16(2):18-24,7.基金项目
国家自然科学基金资助项目(51377112)Project Supported by National Natural Science Foundation of China(51377112) （51377112）
