报告一：电压支撑型储能控制技术研究与实践
报告人：杨龙月（电气安全与综合能源研究所）
报告时间：2023年9月13日（星期三）14:00
报告地点：管理学院报告厅（B108）
报告人简介（教师个人主页）：
http://faculty.cumt.edu.cn/yanglongyue/zh_CN/index.htm
内容摘要：
随着新型电力系统建设的不断深入，高占比新能源、高度电力电子化、交直流高度耦合的“三高”特征愈加凸显，电网供电品质和供电可靠性面临严峻挑战。储能成为解决高比例新能源甚至纯新能源电力系统稳定性问题的一个有效途径，通过有功、无功功率的快速、灵活双向流动，实现对系统的频率、电压稳定问题的有效支撑，从而提升新能源消纳、降低系统频率越限和失稳风险，进一步保障电网安全稳定运行。本次报告主要围绕电压支撑型储能系统进行讨论，分析储能系统控制机理、暂态过电压抑制、稳定性提升、调频能力，探讨储能系统关键技术。最后，通过应用示范分析，对后续研究进行展望。
报告二：新型双凸极电机拓扑设计与驱动控制
报告人：程鹤（电机及其系统研究所）
报告时间：2023年9月13日（星期三）14:45
报告地点：管理学院报告厅（B108）
报告人简介（教师个人主页）：
http://faculty.cumt.edu.cn/CH12345678910111213/zh_CN/index.htm
内容摘要：
双凸极磁阻电机由于结构简单、容错能力强、调速范围宽、成本低等优点，在工业传动、家用电器和航空航天等领域有较多的应用。但是，该类电机存在较大的转矩脉动、较大的噪音和较低的驱动效率等缺点，限制了其在更多高性能需求场合的应用。本报告通过对传统双凸极磁阻电机拓扑结构推演，提出了双凸极永磁电机、双定子双凸极永磁电机和双定子双凸极磁通可调记忆电机等多种新型电机的拓扑结构，并对该类电机的运行机理、多目标优化设计和高性能驱动控制进行了研究，解决了传统双凸极磁阻电机驱动效率偏低和转矩脉动大的技术难题。最后，总结出高性能双凸极电机的设计原则和规律，为后续设计新型电机奠定了理论基础。
报告三：DC circuit breaker technology: Applications and Commercialization
报告人：Muhammad Junaid（高电压与绝缘技术研究所）
报告时间：2023年9月13日（星期三）15:30
报告地点：管理学院报告厅（B108）
报告人简介（教师个人主页）：
http://faculty.cumt.edu.cn/MuhammadJunaid/zh_CN/index.htm
内容摘要：
The global shift towards harnessing renewable energy resources, particularly the solar photovoltaic farms in deserts and offshore wind energy installations, is driving the growing demand for multi-terminal high-voltage direct current (MT-HVDC) systems. Research indicates that HVDC transmission systems become economically advantageous after a distance of 600 kilometers, commonly referred to as the breakeven distance, surpassing the efficiency of traditional HVAC systems. Furthermore, when it comes to realizing MT-HVDC networks, voltage source converter-based high-voltage DC (VSC-HVDC) technology has emerged as the preferred choice over current source converter-based high-voltage DC (CSC-HVDC) systems. Integral to VSC-HVDC systems are HVDC circuit breakers, serving as crucial components.
Nevertheless, effectively clearing DC fault currents presents a unique challenge. Unlike AC systems, DC does not experience zero current crossings, often leading to rapid changes in fault current (di/dt). Therefore, the implementation of a rapid-response DC breaking system is imperative to swiftly isolate fault currents, ensuring the safe operation of DC power systems. Since the 1980s, numerous solutions and prototypes for DC circuit breakers have been proposed. However, the conservative switchgear community remains hesitant to reach a unanimous consensus on a standardized design due to the multitude of challenges inherent to this technology. For instance, the design of DC circuit breakers undergoes significant modifications for different applications. Some applications necessitate high-speed DC circuit breakers, while others prioritize conservative speed with high current interruption capabilities. Unlike their AC counterparts, standardized test circuits for DC circuit breakers were non-existent until recently. There is now some progress towards establishing standardized test circuits for DC circuit breakers, with an impending detailed report in the form of a CIGRE brochure. Nevertheless, a consensus on the standard design for DC circuit breakers remains a pending endeavor.
DC circuit breakers find versatile applications in various fields, including MT-HVDC grids, DC railway systems, submarines, and DC electric aircraft propulsion system protection systems. The specific design of a DC circuit breaker varies for each application, making the standardization and commercialization of this technology a formidable challenge. This presentation will focus on the LC series DC circuit breaker as an illustrative case, exploring its commercial potential, collaboration opportunities with industry partners, and practical integration within the UK Network Rail system. Additionally, we will address the challenges involved in updating the two-decade-old DC rail standard, BS EN 50123. We'll also delve into potential market competitors for DC rail circuit breakers and provide a thorough comparison of our design's performance, size, weight, cost, and, most notably, efficiency against existing models. Concluding the discussion, we will share valuable insights gained from this project and contemplate the prospects of implementing LC DCCB technology in the Chinese DC rail and subway systems. Lastly, we will explore its potential role in shaping and advancing our future circuit breaker designs for commercialization.
