Advanced high frequency medium voltage power architectures for wind energy systems

用于风能系统的先进高频中压电源架构

• 批准号: RGPIN-2015-06511
• 负责人: Lam, John
• 金额: $ 1.6万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=614189
• 关键词: Advanced; frequency; medium; voltage; power

By 2030, wind energy is expected to generate at least 20% of the world’s energy demand. The Global Wind Energy Council (GWEC), has forecasted that the total installed wind capacity will grow by 63% in the next 4 years. A typical offshore wind farm consists of hundreds of mega-watt wind turbines and a medium voltage AC (MVAC) grid that collects the power from the individual wind turbines. Since the output voltage of the turbine is too low for effective long distance power transmission, a dedicated low frequency medium voltage (MV) step-up transformer is used for each wind turbine to step up the turbine output voltage to the MV level. However, the step-up transformers are bulky; heavy, and typically located in the immediate vicinity of the wind turbines. In literature, the MVAC grid has been suggested to be replaced by a MV DC grid, so that the MV step-up transformers can be replaced by the MV medium frequency step-up power converters. However, the conventional MV step-up power converters have low efficiency and poor reliability. With regards to the existing controller structure used in the MV power conversion in wind energy systems, one controller is delegated to the front-end AC/DC stage for maximum power point tracking (MPPT) to extract maximum power from the wind, while another controller is designated for the DC/DC step-up voltage conversion stage to provide output voltage regulation. Therefore, the existing two-stage MV wind power conversion has low power efficiency, poor reliability and requires complex control structures. The proposed research program is to develop novel and efficient power architectures that features advanced high frequency MV power converters and digital control techniques for the MV grid in wind farms. The short term goal of this program is to: (i) devise new high frequency soft-switched MV power converters with high voltage gain; (ii) devise new integration techniques to form a new class of single-stage high frequency MV step-up rectifiers with significantly reduced power losses; (iii) devise new digital controller unit that simultaneously performs MPPT, output voltage regulation and protection function for the given wind and load conditions. While proof-of-concept experimental prototypes will be implemented and tested in the laboratory to confirm all the performance, the long-term goal is to collaborate with industry to further develop the devised technology into a commercial product for use in high power wind turbines.  Advanced and novel MV step-up power converters and controllers developed in this research program will be ground-breaking as they will significantly improve the power efficiency; size; cost and reliability of the existing power converters used in high power wind turbines. Furthermore, successful development of this novel technology will help in establishing Canada as one of the global leaders in power electronics research for renewable energy.

到 2030 年，风能预计将满足世界能源需求的至少 20%。全球风能理事会(GWEC)预测，未来4年风电总装机容量将增长63%。典型的海上风电场由数百兆瓦风力涡轮机和从各个风力涡轮机收集电力的中压交流 (MVAC) 电网组成。由于涡轮机的输出电压太低，无法有效进行长距离电力传输，因此每个风力涡轮机都使用专用的低频中压（MV）升压变压器，将涡轮机输出电压升压到MV水平。然而，升压变压器体积庞大；重，通常位于风力涡轮机附近。文献中建议用中压直流电网取代MVAC电网，这样中压升压变压器就可以被中压中频升压电源转换器取代。然而，传统的中压升压电源变换器效率低、可靠性差。就风能系统中压功率转换中使用的现有控制器结构而言，一个控制器被委托给前端AC/DC级进行最大功率点跟踪（MPPT）以从风中提取最大功率，而另一个控制器被指定用于DC/DC升压电压转换级以提供输出电压调节。因此，现有的两级中压风电变换功率效率低、可靠性差、控制结构复杂。 拟议的研究计划是开发新颖高效的电源架构，该架构具有先进的高频中压电力转换器和风电场中压电网的数字控制技术。该计划的短期目标是： (i) 设计具有高电压增益的新型高频软开关中压功率转换器； (ii) 设计新的集成技术，形成新型单级高频中压升压整流器，功率损耗显着降低； (iii) 设计新的数字控制器单元，在给定的风力和负载条件下同时执行 MPPT、输出电压调节和保护功能。 虽然概念验证实验原型将在实验室中实施和测试以确认所有性能，但长期目标是与业界合作，将所设计的技术进一步开发为用于高功率风力涡轮机的商业产品。  本研究项目开发的先进、新颖的中压升压电源转换器和控制器将具有开创性，因为它们将显着提高电源效率；尺寸;高功率风力涡轮机中使用的现有功率转换器的成本和可靠性。此外，这项新技术的成功开发将有助于使加拿大成为可再生能源电力电子研究的全球领导者之一。