Multi-terminal dc transmission micro-grid system for interfacing multiple wind turbines

用于连接多个风力涡轮机的多端直流输电微电网系统

• 批准号: DT/F006381/1
• 负责人: Barry Williams
• 金额: $ 66.51万
• 依托单位: University of Strathclyde
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2008
• 资助国家: 英国
• 起止时间: 2008 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=DT%2FF006381%2F1
• 关键词: Multi; terminal; dc; transmission; micro

Moves to reduce carbon emissions and improve efficiency has primed interest in new technologies for the generation of electrical power. Unlike conventional plant, new generating technologies are not naturally suited to direct connection to the fixed frequency grid supply. Furthermore, in the case of renewable generation, restrictions on geographical location pose problems for electrical connection. Power electronic conversion thus plays a significant role in efficiently capturing and distributing the generated energy. This proposal addresses one important aspect of this research area: the efficient, robust and low-cost capture and transmission of renewable energy (RE) from multiple renewable resources. The use of DC networks to aggregate and transmit power from has been identified as a solution to such problems; to date work in this area has be concentrated at concept study and simulation level. Our collaborative proposal seeks to develop a novel and innovative DC current link system. The research will investigate the academic research aspects of realising a DC current link technology for the capture of renewable energy and other forms of low-carbon-derived electrical energy. Traditional wind turbine interfacing to the AC grid has been based on AC concepts. Recently ABB have installed the first offshore interconnect based on dc transmission. The system uses their standard HVDC Light technology, which offers bidirectional power flow control. Embedded renewable generation whether wind or wave, onshore or offshore, generally does not require the bidirectional power flow capability of HVDC Light (and similar techniques) but does require efficient, low-cost multi-source control. Existing techniques, e.g.HVDC Light, are not suitable. The proposed system departs from existing DC transmission technology. The proposed system is based on the concept that paralleling energy sources should always be based on paralleling current sources - not voltage sources as currently exemplified by HVDC systems. In our proposed system the single-ended step-up converter, operated with an outer current control loop, is the basic building block. The topology is scaleable, reliable and low-cost compared with existing AC and DC converter technologies used in distribution. Connection of additional sources is simple and low-cost thus the system lends itself to community-based schemes. Additionally, the majority of lower power RE systems utilise permanent magnet generators therefore require only unidirectional power flow from the RE source to the grid. The unidirectional nature of the power flow results in significant simplification of the DC system that is not realised in AC systems and existing bidirectional DC technology. The technology that will be developed by this project is a key enabler for the integration of multi-source low-carbon energy. The academic research team will investigate detailed modelling, simulation, design and experimentation on a demonstrator DC link system. Two PhD themes have been identified. The first will have a PhD student investigating the conversion electronics required to buffer and transform generates electrical energy onto the novel network. The second PhD student will research and address the important issue of regulating the flow of power from the low carbon energy source to the centralised grid interfacing converter. A post-doctoral research fellow will provide overall project management, liaise with the industry partner during development of the six-turbine demonstrator site, and assess and evaluate the performance of the demonstrator. On completion of this project, there will be a six 15kW turbine array that demonstrates the novel conversion technologies and innovative control algorithms developed through this important research. The demonstrator will be an exemplar of the synthesis between internationally-leading academic research, industrial experience and exploitation, and entrepreneurial skill.

减少碳排放和提高效率的举措激发了人们对发电新技术的兴趣。与传统电厂不同，新的发电技术并不适合直接连接到固定频率的电网供电。此外，就可再生能源发电而言，地理位置的限制给电力连接带来了问题。因此，电力电子转换在有效捕获和分配产生的能量方面起着重要作用。该提案解决了该研究领域的一个重要方面：从多种可再生资源中高效，稳健和低成本地捕获和传输可再生能源（RE）。使用直流网络聚合和传输电力已被确定为解决此类问题的一种方法；迄今为止，这一领域的工作主要集中在概念研究和模拟层面。我们的合作提案旨在开发一种新颖的创新直流电流连接系统。该研究将调查实现直流电流连接技术的学术研究方面，以捕获可再生能源和其他形式的低碳衍生电能。传统的风力发电机与交流电网的接口是基于交流概念的。最近，ABB安装了第一个基于直流传输的海上互连。该系统使用他们的标准HVDC Light技术，该技术提供双向功率流控制。嵌入式可再生能源发电，无论是风力发电还是波浪发电，无论是陆上发电还是海上发电，通常都不需要HVDC Light（以及类似技术）的双向电力流动能力，但确实需要高效、低成本的多源控制。现有的技术，如高压直流照明，是不合适的。该系统与现有的直流传输技术不同。所提出的系统是基于这样的概念，即并联的能源应该总是基于并联的电流源，而不是像目前HVDC系统那样的电压源。在我们提出的系统中，单端升压变换器与外部电流控制回路一起工作，是基本的组成部分。与现有配电中使用的交流和直流变换器技术相比，该拓扑具有可扩展性，可靠性和低成本。附加资源的连接简单且成本低，因此该系统适合以社区为基础的计划。此外，大多数低功率的可再生能源系统使用永磁发电机，因此只需要从可再生能源到电网的单向功率流。潮流的单向性使得直流系统大大简化，这在交流系统和现有的双向直流技术中是无法实现的。该项目将开发的技术是多源低碳能源整合的关键推动者。学术研究小组将调查详细的建模，仿真，设计和实验的示范直流链路系统。已经确定了两个博士主题。第一个项目将有一名博士生研究缓冲和转换电能到新网络所需的转换电子设备。第二个博士生将研究和解决调节从低碳能源到集中电网接口转换器的电力流动的重要问题。一名博士后研究员将提供整体项目管理，在开发六涡轮机演示现场期间与行业合作伙伴保持联系，并评估和评估演示器的性能。该项目完成后，将有6台15kW涡轮机阵列，展示通过这项重要研究开发的新型转换技术和创新控制算法。该示范项目将成为国际领先的学术研究、工业经验和开发以及创业技能综合的典范。

项目成果

Hybrid Cascaded Modular Multilevel Converter With DC Fault Ride-Through Capability for the HVDC Transmission System

• DOI: 10.1109/tpwrd.2015.2389758
• 发表时间: 2015-01
• 期刊: IEEE Transactions on Power Delivery
• 影响因子: 4.4
• 作者: Rui Li;G. Adam;D. Holliday;J. Fletcher;B. Williams

Mixed cells modular multilevel converter

• DOI: 10.1109/isie.2014.6864817
• 发表时间: 2014-06
• 期刊: 2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE)
• 作者: G. Adam;K. Ahmed;B. Williams

Half- and Full-Bridge Modular Multilevel Converter Models for Simulations of Full-Scale HVDC Links and Multiterminal DC Grids

• DOI: 10.1109/jestpe.2014.2315833
• 发表时间: 2014-04
• 期刊: IEEE Journal of Emerging and Selected Topics in Power Electronics
• 影响因子: 5.5
• 作者: G. Adam;B. Williams

A Hybrid Modular Multilevel Converter With Novel Three-Level Cells for DC Fault Blocking Capability

• DOI: 10.1109/tpwrd.2015.2423258
• 发表时间: 2015-04
• 期刊: IEEE Transactions on Power Delivery
• 影响因子: 4.4
• 作者: Rui Li;J. Fletcher;Lie Xu;D. Holliday;B. Williams

Three-phase ac-dc buck-boost converter with a reduced number of switches

• DOI: 10.1049/iet-rpg.2014.0077
• 发表时间: 2015-07
• 期刊: Iet Renewable Power Generation
• 影响因子: 2.6
• 作者: I. Abdelsalam;G. Adam;D. Holliday;B. Williams