Development of an algorithm for symmetrizing loads in networks of 0,4 kV at a distributed load along a line

PURPOSE. Consider the problem of unbalance of loads in electrical 0.4 kV networks, causing additional losses of electricity. Particular attention should be paid to networks with predominantly single-phase loads distributed along 0.4 kV lines. (rural electrical networks). To analyze the methods of balancing voltages and loads, both at the stage of designing electrical networks, and during their operation. Keep in mind that even with a properly designed electrical network with a uniform distribution of single-phase loads by phases during operation, due to the random nature of connecting new loads, including short-term connections, (for example, new household electrical receivers), current loads become asymmetric. Particular attention is paid to the issue of balancing load currents by switching them from the most loaded phases to the least loaded ones. Such switching is carried out on power transmission towers using the experience of operating personnel. To develop an algorithm for balancing current loads with the maximum exclusion of the human factor during balancing, using the readings of smart electricity meters as input data. The main idea of the algorithm is the calculation of modes for possible switching.

METHODS. An algorithm that uses preliminary calculations of possible phase switching. When calculating the modes, the Newton-Raphson method was used, implemented by Matlab program.

RESULTS. The article describes the relevance of the topic, considers the effect of asymmetry on the operation of electrical network elements.

CONCLUSION. Calculations substantiating the main provisions of the phase switching optimization algorithm for balancing current loads are presented.

1. A.V. Ded, On the problem of the current state of the levels of indicators of asymmetry of voltages and currents in 0.4 kV networks. Omsk Scientific Bulletin. 2014;20(2):135.

2. K.H. Fadhela and R. T. Abdulmuttalib, Load Balancing in Distribution System Using Heuristic Search Algorithm, International Conference on Advances in Sustainable Engineering and Applications (ICASEA). Wasit University, Kut, Iraq, (2018). pp. 48-53.

3. J.X. Zhu, M.Y. Chow and F. Zhang. Phase Balancing using Mixed-Integer Programming. IEEE Transactions on Powcr Systems.1998;13(4):1487-1492.

4. Ma Kang, Li Ran and Furong Li, Utility-scale estimation of additional reinforcement cost from three-phase imbalance considering thermal constraints. IEEE Transactions on Power Systems. 2017;32(5):912–3923.

5. A. Serdimov, I. Protosvetsky, Balancing device for transformers. Means for voltage stabilization and loss reduction in 0.4 kV networks. News of Electrical Engineering. 2005. №. 1(31).[Online]. Available: http://www.news.elteh.ru/arh/2005/31/14.php.

6. A.I. Orlov, S.V. Volkov and A.A. Saveliev, silt transformers 10 (6) / 0.4 kV. Application areas of different winding connection schemes. Electrical Engineering News. 2006. No. 5(41). [Online]. Available: http://www.news.elteh.ru/arh/2006/41/09.php.

7. I. Maslov, G. Maslova, A. Ishalin и M. Novoselova, Power Quality Assurance with Balancing Transformers 10/0.4 Kw. International Conference on Electro Technical Complexes and Systems. (2022). doi: 10.1109/ICOECS52783.2021.9657254.

8. A.I. Orlov, S.V. Volkov. Comparison of control algorithms for load balancing devices during their group work. Bulletin of the Chuvash University. 2018;3:93–101.

9. A. M. Makletsov, I. F. Galiev, R. I. Galiev, Luu Quoc Cuong, Monitoring of load unbalance in 0.4 kV networks. Energetik Journal. 2019;5:6-25.

10. M. Ben Hamed, L. Sbita и M. Dhaoui. Three-phase balancing in a LV distribution smart-grids using electrical load flow variation: «L.F.B.M.» International Conference on Sciences and Techniques of Automatic Control and Computer Engineering. (2017). P. 427-431.

11. I. M. Valeev, A. Alzakkar, Harmonicas and their Influence When Determining the Method of Compensation of Jet Power in Electrical Networks. Vestnik of Kazan State Power Engineering University. 202;12(1 (45):24-39.

12. V.V. Karchin, V.T. Sidorova, A.N. Leukhin. Improving the quality of electricity in rural distribution networks 0.4 kV using reactive power compensation. Journal of Power engineering: research, equipment, technology. 2015;1-2:61-67.

13. A. Alzakkar, N. P. Mestnikov, F. Alhajj Hassan, I. M. Valeev. Analysis of the dynamic effect of the electrical interconnection on the stability of the rotor angle for synchronous generators in the electric power system of Syria. Power engineering: research, equipment, technology. 2021;23(4):120-133.

14. A.V. Lykin, E.A Utkin, Ower distribution networks with the maximal nearby location of transformer substations to consumers, Journal of Power engineering: research, equipment, technology. 2019;21(3):46-54.

15. E. Smolich, V. Zhuravlev. Operation of urban networks. News of electrical engineerin, 2021;2(128). [Online]. Available: http://www.news.elteh.ru/arh/2021/128-129/.

16. A. Orlov, S. Volkov, A. Savelyev, Аnalysis of influence of load balancing unit on indicators of power supply unbalance, Vestnik of the Chuvash University. № 3. (2016). P. 100108.

17. V.E. Vorotnitsky, Yu.S. Zhelezko, V.M. Maksimov. RD 34.09.254 Instructions for reducing the technological consumption of electrical energy for transmission through electrical networks of power systems and power associations. Developed by the All-Union Scientific Research Institute of Electric Power Industry. (1986). 43 p. [Online]. Available: https://cutt.us/gostovnet.

18. V.V. Karchin, V.T. Sidorova, A.I. Fedotov, Reactive power compensation in the village distribution networks 0,4 kv to improve power quality, Power engineering: research, equipment, technology. 2015;5-6:101-106.

19. N. Mestnikov, A. Alzakkar, I. Valeev, V. Maksimov, Assessment of the Performance of the Solar Power Plant with a Capacity 150W, International Russian Automation Conference, (2021). P. 404-408.

20. V. Ziryukin, R. Solopov, A. Usanov. The 0.4 kV Automatic Balancing Device Model, International Russian Automation Conference (2021). P. 719-727.