High-Power Renewable Energy Systems and Medium Voltage Drives

随着最近的技术进步，兆瓦级的功率转换器越来越多地应用于许多行业，如可再生能源和电机驱动行业。在开发具有可靠、高效和成本效益的专用控制器的大功率变流器系统方面存在许多技术挑战。我未来五年的研究目标是为大型可再生能源系统和电机驱动开发创新的大功率变流器技术和先进的控制策略。具体地说，我将从事以下三个研究项目：1)大型光伏系统的高效无滤波变流器接口和控制；2)大功率风能转换系统的无传感器控制；以及3)无变压器大型电机驱动。 对于第一个项目，我将重点开发可靠、节能和成本效益高的大型并网光伏能源系统。这是通过研究不需要电力线滤波器来满足电网规范的新型电源转换器接口来实现的。在第二个项目中，可从风力中获得的最大功率由大型风力发电机提取，而不需要风速或发电机速度传感器。第三个项目的创新之处在于，通过优化接地方法和控制策略，消除了兆瓦电机驱动中通常需要的昂贵和笨重的隔离变压器。 拟议的研究为当今行业面临的紧迫技术问题提供了重要的知识和实际的解决方案。通过产业合作，研究成果将转移到加拿大可再生能源和电力驱动行业进行商业化，使加拿大经济受益。

With recent technological advancements, power converters in the megawatt range are increasingly used in many industries, such as renewable energy and motor drive industries. There are many technical challenges in developing high-power converter systems with application-specific controllers that are reliable, efficient and cost effective. My research objective in the next five years is to develop innovative high-power converter technologies and advanced control strategies for large renewable energy systems and motor drives. Specifically, I will work on the following three research projects: 1) high-efficiency filterless converter interface and control of large-scale photovoltaic energy systems; 2) sensorless control of high-power wind energy conversion systems; and 3) transformerless large motor drives. For the first project, I will focus on the development of large grid-tied photovoltaic energy systems that are reliable, energy efficient, and cost effective. This is achieved through research of novel power converter interfaces that does not require power-line filters to meet the grid code. In the second project, the maximum power available from the wind is extracted by large wind generators without the need for wind velocity or generator speed sensors. The novelty of the third project is that the costly and bulky isolation transformer, which is normally required in megawatt motor drives, is eliminated by optimal grounding methods and control strategies. The proposed research provides vital knowledge and practical solution to the pressing technical issues facing today's industry. Through industrial collaborations, the research outcomes will be transferred to the Canadian renewable energy and electric drive industries for commercialization, benefiting the Canadian economy.