energyЭнергетика. Известия высших учебных заведений и энергетических объединений СНГENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations1029-74482414-0341BNTU10.21122/1029-7448-2023-66-2-124-140energy-2253Research ArticleЭЛЕКТРОЭНЕРГЕТИКАELECTRICAL POWER ENGINEERINGОперативная идентификация сопротивлений проводов распределительных сетей 380 В автоматизированными системами учетаOperational Identification of Resistances of Wires of 380 V Distribution Networks by Automated Accounting SystemsДаниловМ. И.DanilovM. I.

Адрес для переписки:Данилов Максим Иванович - Северо-Кавказский федеральный университет,ул. Пушкина, 1, 355017, г. Ставрополь, Российская Федерация.Тел.: +7 8652 94-59-15mdanilov@ncfu.ru

Address for correspondence:Danilov Maxim I. -North-Caucasus Federal University,1, Pushkin str., 355017, Stavropol, Russian Federation.Tel.: +7 8652 94-59-15mdanilov@ncfu.ru

mdanilov@ncfu.ruРоманенкоИ. Г.RomanenkoI. G.

г. Ставрополь

Stavropol

Северо-Кавказский федеральный университетРоссияNorth-Caucasus Federal UniversityRussian Federation202304042023662124140Copyright © Данилов М.И., Романенко И.Г., 20232023Данилов М.И., Романенко И.Г.Danilov M.I., Romanenko I.G.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://energy.bntu.by/jour/article/view/2253

Рассматриваются четырехпроводные распределительные электрические сети 0,4 кВ, оснащенные автоматизированными системами учета электрической энергии. Решается задача идентификации сопротивлений проводов распределительной сети на основе действующих значений напряжений и токов, а также их углов сдвига фаз, получаемых системой учета в узле питания сети и у ее абонентов для выбранных интервалов наблюдения. Проводится краткий анализ известных методов и технологий, применяемых в указанном направлении исследований. Отмечается важность формулируемой проблемы для прикладных задач: контроля и диагностики потерь электрической энергии, а также технического состояния сети. Предлагается метод (алгоритм), позволяющий определять неизвестные, неодинаковые комплексные сопротивления межабонентских участков распределительной сети. В этих сопротивлениях реактивные составляющие считаются равными в пределах межабонентского участка, активные – отличаются вследствие воздействия неодинаковых протекающих токов и/или погодных факторов. При этом необходимы данные двух разных режимов работы сети, которые на основе анализа динамики изменения питающих токов и/или напряжений отбираются прибором системы учета, подключенным в узле питания. Учитывая, что активные сопротивления проводов должны оставаться неизменными, для расчетов используется режим до изменения энергопотребления в сети и следующий сразу (порядка 0,1 с) после него. Приведен пример расчета, демонстрирующий достоверность предлагаемых уравнений разработанного метода на моделируемой распределительной сети. Результаты исследований ориентированы на усовершенствование автоматизированных систем учета и реализацию их новых функций, повышающих надежность распределительных сетей, а также позволяющих организовать оперативное выявление нетехнических потерь электрической энергии.

Four-wire distribution electrical networks of 0.4 kV equipped with automated systems of electrical energy accounting are considered. The problem of identifying the resistances of the wires of the distribution network is solved on the basis of the effective values of voltages and currents, as well as of their phase shift angles obtained by the accounting system in the power supply node of the network and from its subscribers for the selected observation intervals. A brief analysis of the known methods and technologies used in this area of research is carried out. The importance of the formulated problem for applied problems, such as control and diagnostics of electrical energy losses, as well as the technical condition of the network, is noted. A method (algorithm) is proposed that allows determining unknown, unequal complex resistances of inter-subscriber sections of the distribution network. In these resistances, the reactive components are considered equal within the inter-subscriber section; the active components differ due to the influence of unequal flowing currents and/or weather factors. At the same time, data from two different network operating modes are required, which are selected based on the analysis of the dynamics of changes of supply currents and/or voltages by the accounting system device connected to the power supply node. Considering that the active resistances of the wires must remain unchanged, the mode that is used for calculations is the one that is before the change in power consumption in the network and the next one immediately (about 0.1 s) after it. An example of a calculation that demonstrates the reliability of the proposed equations of the method that has been developed on a simulated distribution network is given. The research results are focused on the improvement of automated accounting systems and the implementation of their new functions that elevate the reliability of distribution networks, as well as allowing for the rapid identification of non-technical losses of electrical energy.

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The authors declare that there are no conflicts of interest present.