With regard to a medium-voltage distribution system with low voltage electrical loads (hereafter written as ELs) and distributed generations (hereafter written as DGs), this study proposes a new calculation method for estimating electrical states such as line-to-line voltage vectors and line current vectors at connection points. The proposed method uses the following selected electrical data as input data: (i) active powers and reactive powers measured with the smart meters (hereafter written as SMs) on low voltage ELs and DGs and (ii) a line-to-line voltage and a current measured with a load break switch on the medium voltage distribution line, but does not use voltages and currents measured with the SMs on low voltage ELs and DGs. The selection of the used data attains reduction in the enormous number of data collected from SMs and also contributes to needless information on vast number of low voltage distribution lines such as their line impedances. Simulation results obtained, using the proposed method, show that the accurate electrical state of a medium voltage distribution line is derived through a small correction number for various generation powers of a DG. The knowledge acquired through this study is actually applied to the centralized voltage control system installed in an electric power company. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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具有分布式电源的中压配电线路的状态估计：智能电表测量的选择使用

针对具有低压用电负荷（以下简称EL）和分布式发电（以下简称DG）的中压配电系统，本研究提出了一种新的估计线间电压矢量等电气状态的计算方法和连接点处的线电流矢量。所提出的方法使用以下选定的电气数据作为输入数据：（i）在低压 EL 和 DG 上使用智能电表（以下简称 SM）测量的有功功率和无功功率，以及（ii）线间电压和使用中压配电线路上的负载断路开关测量的电流，但不使用低压 EL 和 DG 上的 SM 测量的电压和电流。所用数据的选择减少了从 SM 收集的大量数据，并且还有助于提供关于大量低压配电线路的不必要信息，例如它们的线路阻抗。使用所提出的方法获得的仿真结果表明，中压配电线路的准确电气状态是通过 DG 的各种发电功率的小校正数得出的。通过本次学习获得的知识实际应用于安装在电力公司的集中电压控制系统。© 2022 日本电气工程师协会。由 Wiley Periodicals LLC 出版。显示中压配电线路的准确电气状态是通过 DG 的各种发电功率的小校正数得出的。通过本次学习获得的知识实际应用于安装在电力公司的集中电压控制系统。© 2022 日本电气工程师协会。由 Wiley Periodicals LLC 出版。显示中压配电线路的准确电气状态是通过 DG 的各种发电功率的小校正数得出的。通过本次学习获得的知识实际应用于安装在电力公司的集中电压控制系统。© 2022 日本电气工程师协会。由 Wiley Periodicals LLC 出版。