Protecting the Future Electric Power Systems

保护未来电力系统

• 批准号: RGPIN-2017-04772
• 负责人: BadrkhaniAjaei, Firouz
• 金额: $ 1.75万
• 依托单位: University of Western Ontario
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=711212
• 关键词: Protecting; Future; Electric; Power; Systems

Direct Current (DC) grids are emerging electric power systems with remarkable potential benefits. The High-Voltage DC (HVDC) grid improves reliability and efficiency of bulk power transmission systems and also facilitates grid integration of large-scale renewable generation systems. The medium-voltage and low-voltage DC grids and the DC microgrid facilitate integration of distributed energy resources. However, unresolved protection issues have constrained utilization of DC grids. The existing protection systems (relays) do not fully protect DC grids against adverse effects of faults (short-circuits) and disturbances. The long-term objective of the proposed research program is to ensure secure operation of DC grids in the future electric power systems by developing high-speed, reliable, robust, and selective protection strategies. In the short-term, the proposed research program will address the main protection issues of the HVDC grid and the DC microgrid, as explained below. 1) HVDC Grid Protection Currently there is no commercially available technology for fault protection of transmission lines in the meshed HVDC grid. A protection strategy will be developed to enable timely and reliable fault detection and location (identification of the faulted line) in the HVDC grid. The proposed protection strategy will be applicable to HVDC grids with different configurations, grounding types, and converter technologies. In addition, a wide-area System Protection Scheme (SPS) will be developed to protect integrity of the HVDC grid by detecting and counteracting line overloading conditions that can lead to cascading outages. 2) DC Microgrid Protection The existing protection strategies do not meet the speed and reliability requirements for DC microgrid applications. The proposed research program will develop a protection strategy for high-speed and reliable fault protection of DC microgrid feeders. Besides, a SPS will be developed to protect integrity of the DC microgrid against voltage collapse. The SPS will be capable of taking timely remedial actions to counteract the disturbances that can lead to voltage collapse, under both grid-connected and islanded operation modes. The proposed research program will advance the state-of-the-art in protection of the HVDC grid and the DC microgrid, and thereby: 1) lead to development and commercialization of the first relays to protect these DC grid against faults and system-wide disturbances; 2) facilitate long-distance transmission of bulk power with higher reliability and efficiency, in large countries including Canada; 3) improve dynamics and stability of the modernized power grid by preventing widespread catastrophic failures, e.g., the blackout of 2003 in Canada and USA; and 4) increase penetration of renewable energy systems into Canadian distribution systems.

直流电流（DC）网格是具有显着潜在好处的新兴电力系统。高压DC（HVDC）网格提高了大量电力传输系统的可靠性和效率，还促进了大规模可再生生成系统的网格整合。中电压和低压直流电网以及直流微电网促进分布式能源的整合。但是，未解决的保护问题限制了直流网格的利用。现有的保护系统（继电器）不能完全保护直流电网免受故障（短路）和干扰的不利影响。 拟议的研究计划的长期目标是通过制定高速，可靠，健壮和选择性的保护策略来确保DC电网在未来的电力系统中的安全操作。在短期内，拟议的研究计划将解决HVDC电网和DC微电网的主要保护问题，如下所述。 1）HVDC电网保护 当前，在网状HVDC网格中尚无商业上可用的技术来保护输电线路的故障。将制定一种保护策略，以启用HVDC网格中的及时可靠的故障检测和位置（对故障线的识别）。拟议的保护策略将适用于具有不同配置，接地类型和转换器技术的HVDC网格。此外，将开发大区域的系统保护方案（SP），以通过检测和抵消线上的过载条件来保护HVDC网格的完整性，从而导致级联中断。 2）DC微电网保护 现有的保护策略不符合DC微电网应用的速度和可靠性要求。拟议的研究计划将制定针对直流微电网喂食器的高速和可靠故障保护的保护策略。此外，将开发一个SPS来保护直流微电网的完整性免受电压塌陷。 SPS将能够及时采取补救措施，以抵消在网格连接和岛屿的操作模式下可能导致电压塌陷的干扰。 拟议的研究计划将促进保护HVDC电网和DC微电网的最先进，从而： 1）导致第一个继电器的开发和商业化，以保护这些直流电网免受断层和全系统干扰的影响； 2）在包括加拿大在内的大国，促进具有较高可靠性和效率的散装能力的长途传播； 3）通过防止广泛的灾难性失败，例如2003年在加拿大和美国的停电来改善现代化电网的动力和稳定性；和 4）增加可再生能源系统进入加拿大分布系统的渗透。