Protection of the Next Generation of Power Distribution Systems

保护下一代配电系统

• 批准号: RGPIN-2016-05305
• 负责人: Hooshyar, Ali
• 金额: $ 2.26万
• 依托单位: University of Toronto
• 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=709638
• 关键词: Protection; Next; Generation; Power; Distribution

Driven by the smart grid and green energy initiatives, new features and technologies are proliferating across the legacy power system. This research program will respond to the rising protective relaying challenges imposed by these emerging developments, thus ensuring the fault resiliency and reliability of next-generation power systems. In the short term, the focus will be on distribution systems, and the following issues will be researched. 1. Microgrid protection: Even though existing distribution relays fail to reliably protect microgrids, no microgrid-specific relay has been manufactured to date. To address this gap, a microgrid relay will be developed by investigating the unconventional sequence components, waveshape properties and magnitude of the fault currents and voltages of distributed generation (DG) units. The main protection units of a relay are controlled by a number of supervising elements, which are critical to successful relay operation. Two relay supervising elements that can be affected in a microgrid will be researched. 2. Photovoltaic (PV) farm protection: Solar PV is a common technology in the DGs connected to distribution systems. PV farms sustain heavy losses due to internal faults. Moreover, malfunction of the existing PV farm protective devices have recently resulted in several fire incidents. This program will develop PV farm protection methods based on correlation analysis of string current waveshapes and string voltage distribution. 3. Phasor measurement for distribution systems: Wide-area measurement systems (WAMS) are being extended to distribution systems, where the voltages and currents include higher levels of pollution. On the other hand, more-precise measurements are required at the distribution level. This research will integrate demodulators in the phasor measurement algorithms and so help to eliminate the effect of signal pollution. 4. Protection of low-voltage (LV) dc systems: While relay communication can address the protection challenges of LV dc systems, a communication network is hard to justify economically for most LV systems. This research will formulate new relay communication schemes for LV systems, using emerging low-cost wireless technologies such as cellular networks. Then, adaptive protection methods will be developed taking into account the properties of the wireless technology adopted. The improved distribution protection methods developed through this program will be essential to (i) realization of microgrids, (ii) higher penetration of renewable-based DGs, (iii) more-accurate WAMS for distribution systems, and (iv) cost-effective distribution relay communication. Fault resilient and sustainable operation of next-generation Canadian distribution utilities are among the contributions of the above projects. Other beneficiaries of this program include relay manufacturers and the solar PV industry.

在智能电网和绿色能源计划的推动下，新功能和技术正在传统电力系统中激增。该研究计划将应对这些新兴发展带来的日益严峻的继电保护挑战，从而确保下一代电力系统的故障恢复能力和可靠性。短期内，重点将放在分配系统上，并研究以下问题。 1.微电网保护：尽管现有的配电继电器无法可靠地保护微电网，但迄今为止还没有制造出微电网专用的继电器。为了弥补这一差距，将通过研究分布式发电（DG）单元的非常规序列分量、波形特性以及故障电流和电压的幅度来开发微电网继电器。继电器的主要保护单元由许多监控元件控制，这对于继电器的成功运行至关重要。将研究微电网中可能受到影响的两个继电器监控元件。 2. 光伏（PV）农场保护：太阳能光伏发电是连接配电系统的分布式电源的常用技术。光伏电站因内部故障而损失惨重。此外，近期因现有光伏电站保护装置故障而引发多起火灾事故。该项目将开发基于组串电流波形和组串电压分布相关性分析的光伏电站保护方法。 3.配电系统的相量测量：广域测量系统（WAMS）正在扩展到电压和电流污染程度较高的配电系统。另一方面，在分布层面需要更精确的测量。这项研究将在相量测量算法中集成解调器，从而有助于消除信号污染的影响。 4. 低压 (LV) 直流系统的保护：虽然继电器通信可以解决低压直流系统的保护挑战，但对于大多数低压系统来说，通信网络很难经济地证明其合理性。这项研究将利用蜂窝网络等新兴低成本无线技术，为低压系统制定新的中继通信方案。然后，将考虑所采用的无线技术的特性来开发自适应保护方法。 通过该计划开发的改进的配电保护方法对于 (i) 实现微电网、(ii) 提高可再生能源 DG 的渗透率、(iii) 更准确的配电系统 WAMS 以及 (iv) 具有成本效益的配电至关重要中继通信。下一代加拿大配电设施的故障恢复能力和可持续运行是上述项目的贡献之一。该计划的其他受益者包括继电器制造商和太阳能光伏行业。