考虑故障重构和状态估计精度的配电网络中 PMU 和 DULR 的联合优化布局

IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
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引用次数: 0

摘要

由于配电网的快速发展,迫切需要高精度的状态估计和安全稳定的运行,本文在考虑故障重构和状态估计精度的基础上,提出了配电网中相量测量单元(PMU)和两用线路继电器(DULR)的联合优化布置方法。该方法旨在最大限度地降低 PMU 和 DULR 的配置成本。基于已知的伪测量和监控与数据采集(SCADA)测量,我们采用状态估计误差协方差矩阵的 E-最优标准设计来形成状态估计精度指标,并将馈线终端单元(FTU)设备和 DULR 设备的继电保护功能纳入故障重构的考虑范围。通过求解混合整数半有限编程(MISDP)模型,得到最优布点结果,使正常状态下的网络和多重故障重构后的网络分别满足状态估计精度和负载损耗率的约束条件。以 IEEE 33 节点、123 节点系统为例,对提出的方法进行了测试。实验结果表明,所提出的方法是有效和实用的。由于新型 µPMU 设备 DULR 具有与 FTU 相同的继电保护功能,且分布式发电可在故障后向孤岛供电,因此本文在约束条件中增加了负荷损失率,以研究故障重构对布置方案的影响。本文采用了一种考虑混合测量的新型两步 SE 方法,在保证计算结果准确性的同时,提高了大规模系统实时 SE 的计算效率。我们在 IEEE-33 和 IEEE-123 系统中进行了测试。经过初步验证,与单一故障场景相比,我们发现考虑多种故障场景的布置方案能有效提高状态估计的准确性,降低各故障场景的负荷损失率,仅增加少量成本。网络中 DG 和联络线数量的增加也将有效提高布置方案的可行性。FTU 配置数量的增加可以通过增加少量 µPMU 来有效减少 DULR 的配置,从而降低总成本。在未来的研究中,我们将进一步考虑 µPMU、DULR 和 FTU 的综合配置,以满足更多的故障场景,同时降低成本。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Joint optimal PMU and DULR placement in distribution network considering fault reconstruction and state estimation accuracy
Due to the rapid development of the distribution network, there is an urgent need for high-precision state estimation and safe and stable operation, this paper proposes a joint optimal placement method for Phasor Measurement Unit (PMU) and Dual Use Line Relay (DULR) in distribution networks considering fault reconstruction and state estimation accuracy. The proposed method aims to minimize the cost of PMU and DULR configuration. Based on the known pseudo-measurements and Supervisory Control and Data Acquisition (SCADA) measurements, we use the E-optimal standard design of the state estimation error covariance matrix to form the state estimation accuracy index and take the relay protection function of Feeder Terminal Unit (FTU) device and DULR device into consideration of the fault reconstruction. By solving the mixed integer semidefinite programming (MISDP) model, the optimal placement result is obtained, so that the network under normal condition and the network after multiple fault reconstruction can meet the constraints of state estimation accuracy and load loss rate respectively. The proposed method is tested on IEEE 33-node, 123-node systems as an example. The experimental results show that the proposed method is effective and practical.
Note to Practitioners—This study is stimulated by the need for optimizing the placement of Micro-PMU (µPMU) in distribution network. Since the new µPMU device DULR has the same relay protection function as FTU, and distributed generation can supply power to the island after failure, this paper adds the load loss rate to the constraint conditions to study the influence of fault reconstruction on the placement scheme. A new two-step SE method considering mixed measurements was used in this paper to improve the computational efficiency of real-time SE of large-scale system while ensuring the accuracy of the calculation results. We have conducted tests in IEEE-33 and IEEE-123 systems. After preliminary verification, compared with the single fault scenario, we find that the placement scheme considering multiple fault scenarios can effectively improve the accuracy of state estimation and reduce the load loss rate of each fault scenario and only increase the cost a little. The increase in the number of DG and contact lines in the network will also effectively improve the feasibility of the placement scheme. The increase of the number of FTU configurations can effectively reduce the configuration of DULR by adding a small amount of µPMU, reduce the total cost as a result. In future studies, we will further consider the integrated configuration of µPMU, DULR and FTU, to meet more failure scenarios while reducing costs.
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来源期刊
International Journal of Electrical Power & Energy Systems
International Journal of Electrical Power & Energy Systems 工程技术-工程:电子与电气
CiteScore
12.10
自引率
17.30%
发文量
1022
审稿时长
51 days
期刊介绍: The journal covers theoretical developments in electrical power and energy systems and their applications. The coverage embraces: generation and network planning; reliability; long and short term operation; expert systems; neural networks; object oriented systems; system control centres; database and information systems; stock and parameter estimation; system security and adequacy; network theory, modelling and computation; small and large system dynamics; dynamic model identification; on-line control including load and switching control; protection; distribution systems; energy economics; impact of non-conventional systems; and man-machine interfaces. As well as original research papers, the journal publishes short contributions, book reviews and conference reports. All papers are peer-reviewed by at least two referees.
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