REDUCTION OF ELECTRICITY LOSSES IN THE 0,95 kV DISTRIBUTION NETWORK WITH UNBALANCED LOAD

DOI: 10.47026/1810-1909-2023-2-121-127

УДК 621.31

ББК 31.25

Alexandr I. ORLOV, Ilya A. SAPOZHNIKOV

Key words

0,95 kV, 0,95/0,4 kV, load unbalance coefficient, load balancing device, power loss

Abstract

An additional voltage stage of 0,95 kV allows to reduce losses for the transmission of electricity in long-distance distribution networks with sufficient transmitted power. A pilot project of such network has been implemented. However, the practice of using this voltage class is not widespread at present. As an additional energy-saving means in 0,95 kV networks, it is possible to use a load equalization device operating on the principle of redistribution of phases of one of the outgoing lines in the node of the electrical network.

The purpose of the study is to evaluate the effectiveness and technical feasibility of using a load balancing device in 0,95 kV networks. The novelty of the work is due to determining the magnitude of power losses in the 10/0,95/0,4 kV system when using a load balancing device.

Materials and methods. Methods of theoretical electrical engineering, combinatorics, numerical experiments, and statistical data processing are used in the work.

Results. Calculations were made on the example of the section of the 10/0,95/0,4 kV computer network using Python programs. The load of 0,95/0,4 kV transformer consists of 2 parts: one part is connected to the 0,4 kV switchgear directly, the other part is connected through a load balancing device. It was assumed that each phase of the load with equal probability can have one of the discrete values in the range from zero to the maximum value. In the numerical experiment, all possible options for the distribution of phase loads of lines extending from the 0,95/0,4 kV transformer substation were considered when the load of each phase was divided into 21 levels in magnitude.

Conclusions. As an additional energy-saving tool in distributed networks of 0.95 kV, it is possible to use a load balancing device, which makes it possible to reduce additional energy losses from load unevenness by an average of 10%.

References

1. Knyazev V. Napryazhenie vyshe – zatraty nizhe [Voltage is higher – costs are lower]. Available at: http://www.energyland.info/analitic-show-99870.
2. Kombin N.N. Innovatsionnaya raspredelitel’naya set’ napryazheniem 0,95 kV. [Innovative 0.95 kV distribution network]. Elektrotsekh, 2016, no. 1. Available at: https://panor.ru/articles/innovatsionnaya-raspredelitelnaya-set-napryazheniem-095-kv/70704.html.
3. Loskutov A.B., Fitasov A.N., Petritskii S.A. Otsenka energeticheskoi effektivnosti primeneniya napryazheniya 0,95 kV v sisteme elektrosnabzheniya s raspredelennoi nagruzkoi [Evaluation of the energy efficiency of the application of 0.95 kV voltage in a distributed load power supply system]. Trudy NGTU im. R. E. Alekseeva, 2019, no. 3(126), pp. 73–79.
4. Orlov A.I., Volkov S.V., Garipov I.Kh., Savel’ev A.A. Konstruktsiya silovoi chasti ustroistva vyravnivaniya nagruzki dlya trekhfaznykh elektricheskikh setei 0,4 kV [The design of the power part of the load equalization device for three-phase 0.4 kV electrical networks]. In: Materialy Pyatnadtsatoi mezhdunarodnoi nauchnoi shkoly «Nauka i innovatsii-2020» ISS «SI-2020» [Materials of the Fifteenth International Scientific School “Science and Innovation-2020” ISS “SI-2020”]. Yoshkar-Ola, 2020, pp. 58–63.
5. Rekonstruktsiya TP-6/0,4 kV, stroitel’stvo pervoi v Rossii innovatsionnoi seti 6/0,95/0,4 kV v g. Bogorodsk [Reconstruction of TP-6/0.4 kV, construction of Russia’s first innovation network 6/0.95/0.4 kV in Bogorodsk]. Available at: https://nipom.ru/solutions/industry/rekonstrukcziya-tp-6/0,4-kv,-stroitelstvo-pervoj-v-rossii-innovaczionnoj-seti-6/0,95/0,4-kv-v-g.-bogorodsk.
6. Söderberg D. System topologies and transformers for 1 kV networks. In: 22^nd International Conference and Exhibition on Electricity Distribution (CIRED 2013), 2013, pp. 1–4. DOI: 10.1049/cp.2013.1230.
7. Lohjala J., Kaipia T., Lassila J., Partanen J. The three voltage level distribution using the 1000 V low voltage system. In: CIRED 2005 – 18^th International Conference and Exhibition on Electricity Distribution, 2005, pp. 1–5, doi: 10.1049/cp:20051299.
8. Özen K., Cebeci M.E., Tör O.B. et al. Implementation of 1 kV on LV feeders: A smart alternative to MV line investments to solve voltage drop problems at LV systems. In: 2017 5^th International Istanbul Smart Grid and Cities Congress and Fair (ICSG), 2017, pp. 27–31. DOI: 10.1109/SGCF.2017.7947630.

Information about the authors

Alexandr I. Orlov – Candidate of Technical Sciences, Head of the Department of Electromechanics, Mari State University, Russia, Yoshkar-Ola (a.i.orlov@yandex.ru; ORCID: https://orcid.org/0000-0003-1152-6668).

Ilya A. Sapozhnikov – 2^nd Year Student, Electric Power Faculty, Mari State University, Russia, Yoshkar-Ola (shumkenrp@gmail.com; ORCID: https://orcid.org/0000-0002-9768-9574).

For citations

Orlov A.I., Sapozhnikov I.A. REDUCTION OF ELECTRICITY LOSSES IN THE 0,95 kV DISTRIBUTION NETWORK WITH UNBALANCED LOAD. Vestnik Chuvashskogo universiteta, 2023, no. 2, pp. 121–127. DOI: 10.47026/1810-1909-2023-2-121-127 (in Russian).

Download the full article