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风电变流器改进型断续脉宽调制策略研究
Research on improved discontinuous pulse width modulation strategy for wind power converters
投稿时间:2017-11-30  修订日期:2018-01-23
DOI:
中文关键词:  直流微网  风电变流器  断续脉宽调制
英文关键词:DC microgrid  wind power converter  DPWM
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
耿毓廷 浙江大学电气学院 gengyuting@zju.edu.cn 
李姗 中国船舶重工集团公司重工第七〇四研究所 bbh704@163.com 
李武华 浙江大学电气学院 woohualee@zju.edu.cn 
何湘宁 浙江大学电气学院 hxn@zju.edu.cn 
曹丰文 苏州市职业大学电子信息工程学院 cfw@jssvc.edu.cn 
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中文摘要:
      大功率风力发电变流器中,存在开关损耗和电流THD难以均衡的矛盾,如何优化调制方式,以提高系统效率,减小电流谐波,是大功率风电变流系统的核心技术之一。本文针对风电变流器宽频率、宽电压运行范围的特点,分析直驱风电变流器采用断续脉宽调制策略下的损耗和谐波性能,发现不同工况下主要关注指标不同,轻载时电能质量恶劣、开关损耗低,而重载时开关损耗严重、电能质量好;但是常用调制方式很难兼顾。为解决该问题,提出一种适用于永磁同步机直驱风电变流器的新型断续脉宽调制策略,该调制策略对开关损耗和THD的优化特性随变流器工作范围变化,实现不同工况下主要关注指标的优化。最后通过实验平台验证了该方案在重载时减小开关损耗,在轻载时降低电流谐波的有效性。
英文摘要:
      For the high-power wind power converter, there is a contradiction between the switching loss and the current THD. How to optimize the modulation mode of the wind power converter, reduce the system loss and improve the system harmonic performance is one of the core technologies of high-power wind power converter system. In this paper, the loss and harmonic performance of discontinuous pulse width modulation (DPWM) technique is studied. Aiming at the characteristics of wind power converters’ wide operating range of frequency and voltage, this article analyzes the loss and harmonic performance of direct-drive wind power converters using discontinuous pulse width modulation. It is found that the main concerns are different under different operating conditions, with poor power quality and low switching losses at light loads, while the switching losses are heavy, and the power quality is good at heavy loads. However, common modulation methods are difficult to take account both THD and Losses. To solve this problem, a new discontinuous pulse width modulation strategy is proposed for the direct-drive wind power converters of permanent magnet synchronous machines. The switching losses and the optimal characteristics of THD in this modulation strategy vary with the operating range of the converter Optimization of Main Concern Index under Different Operating Conditions. Finally, the experimental platform verifies that the scheme can reduce the switching loss under heavy load and reduce the current harmonics at light load.
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