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，风能预计将产生世界能源需求的20％。全球风能委员会（GWEC）预测，未来4年的总安装风能将增长63％。一个典型的离岸风电场由数百个大瓦风力涡轮机和中型电压AC（MVAC）网格组成，可从各个风力涡轮机中收集功率。由于涡轮机的输出电压太低，无法进行有效的长距离电源传输，因此使用专用的低频中型电压（MV）升压变压器，用于每个风力涡轮机将涡轮输出电压上升到MV水平。但是，加速变压器很笨重。沉重，通常位于风力涡轮机的附近。在文献中，已经建议将MVAC网格替换为MV DC网格，因此MV加速变压器可以被MV中频率加速功率转换器替换。但是，常规的MV加速电源转换器的效率低和可靠性差。关于风能系统中MV功率转换中使用的现有控制器结构，将一个控制器委派到前端AC/DC阶段，以进行最大功率点跟踪（MPPT），以从风中提取最大功率，而DC/DC升级电压转换阶段则指定了另一个控制器，以提供输出电压调节。因此，现有的两阶段MV风能转换具有低功率效率，可靠性差，并且需要复杂的控制结构。 拟议的研究计划是开发新颖有效的功率体系结构，这些功率体系结构具有高级高频MV电源转换器和用于风电场的MV网格的数字控制技术。该程序的短期目标是：（i）使用高电压增益设计新的高频软转换MV电源转换器； （ii）设计新的集成技术，以形成新的一类单级高频MV加速整流器，其功率损耗大大降低； （iii）设计新的数字控制器单元，该单元仅执行MPPT，输出电压调节和针对给定的风和负载条件的保护功能。 概念验证实验原型将在实验室中实施和测试以确认所有绩效，但长期目标是与行业合作，将定义的技术进一步开发为商业产品，以用于高功率风力涡轮机。该研究计划中开发的先进和新颖的MV加速电源转换器和控制器将是突破性的，因为它们将显着提高功率效率。尺寸;现有电动机中现有电源转换器的成本和可靠性。此外，这项新型技术的成功开发将有助于建立加拿大作为可再生能源电力电子研究的全球领导者之一。