Fault Analysis and Control of Inverter-Interfaced Energy Systems for Reliable Protective Relaying

逆变器接口能源系统的故障分析和控制以实现可靠的继电保护

• 批准号: RGPIN-2017-04990
• 负责人: Abdelkhalek, Maher
• 金额: $ 1.75万
• 依托单位: University of Windsor
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=643306
• 关键词: Fault; Analysis; Control; Inverter; Interfaced

Green energy and smart grid initiatives are driving the move from legacy power systems toward sustainable systems with new features such as microgrids and renewable energy sources (RES). Bridging the gap between the renewable energy industry and relay manufacturers, this research will respond to growing challenges related to protective relaying to ensure the fault resiliency and reliability of next-generation power systems. The following issues will be investigated.***1. Microgrid fault analysis: Lack of accurate fault analysis algorithms for microgrids forces protection engineers either (i) to use conventional short-circuit calculation tools that fail to provide reliable microgrid protection or (ii) to employ detailed time-domain microgrid simulation models that are time-consuming and commercially infeasible. For these reasons, optimal protection coordination of directional overcurrent relays (DOCRs) has been limited to microgrids that employ synchronous generators (SGs), whereas modern microgrids are typically powered by inverter-interfaced distributed generators (IIDGs). To address this gap, sequence-component inverter fault models will be developed that include consideration of different control modes, inverter current limits, and reactive current generation (RCG) requirements, and will then be integrated into new microgrid short-circuit calculations. The resultant fault analysis algorithms will be exploited for the creation of new protection coordination indices and the optimization of DOCR operation.***2. Microgrid phase selection: To improve microgrid reliability and resiliency during faults, phase selection methods (PSMs) should accurately trip faulty phases. Significant differences between IIDG and SG fault current signatures can cause the misoperation of existing PSMs. This research will address this problem at its source, i.e., the inverter side, by developing new control algorithms in the sequence-component control frames to enable accurate operation of the PSMs used by commercial relays.***3. Distance protection of renewable energy systems: Distance relays are normally utilized as either primary or backup transmission system protection. Inverter-interfaced RES can cause unreliable relay impedance measurements, thus impairing the operation of distance relays. This research will develop new fault ride-through and RCG techniques that can provide ancillary services to distance relays, leading to accurate impedance measurements without the need for relay communication or upgrades.***The fault analysis and inverter control algorithms developed through this program will be crucial for (i) fault-resilient and sustainable microgrid operation, (ii) greater RES penetration, and (iii) cost-effective protective relaying. The industrial beneficiaries include Canadian utilities, relay manufacturers, and the renewable energy industry.

绿色能源和智能电网倡议正在推动从传统电力系统向具有微电网和可再生能源(RES)等新功能的可持续系统的转变。为弥合可再生能源行业和继电器制造商之间的差距，这项研究将应对与继电保护相关的日益增长的挑战，以确保下一代电力系统的故障弹性和可靠性。微电网故障分析：缺乏准确的微电网故障分析算法迫使保护工程师(I)使用传统的短路计算工具无法提供可靠的微电网保护，或者(Ii)使用耗时且商业上不可行的详细的时间域微电网仿真模型。由于这些原因，方向过流继电器(DOCR)的最佳保护配合仅限于使用同步发电机(SGS)的微电网，而现代微电网通常由逆变器接口分布式发电机(IIDG)供电。为了弥补这一差距，将开发考虑不同控制模式、逆变器电流限制和无功电流产生(RCG)要求的顺序分量逆变器故障模型，然后将其整合到新的微电网短路计算中。所得到的故障分析算法将被用于创建新的保护协调指数和优化DOCR运行。*2.微电网选相：为了提高微电网在故障期间的可靠性和弹性，选相方法(PSM)应该准确地跳闸故障相。IIDG和SG故障电流特征的显著差异可能会导致现有PSM的误操作。这项研究将在其源头，即逆变器侧，通过在顺序分量控制帧中开发新的控制算法来解决这个问题，以使商业继电器使用的PSM能够准确运行。*3.可再生能源系统的距离保护：距离继电器通常用作主或备用输电系统保护。逆变器接口的RE会导致继电阻抗测量不可靠，从而影响距离继电器的运行。这项研究将开发新的故障穿越和RCG技术，可以为距离继电器提供辅助服务，从而在不需要继电器通信或升级的情况下实现准确的阻抗测量。*通过该程序开发的故障分析和逆变器控制算法将对(I)故障弹性和可持续微电网运行、(Ii)更大的RES穿透和(Iii)经济高效的保护继电保护至关重要。行业受益者包括加拿大公用事业公司、继电器制造商和可再生能源行业。