Identification of quality and energy efficiency of low-voltage power transmission

   Providing consumers with high quality electric power with minimum transmission losses is one of the problems of electric power transmission through power grids. Increasing reactive power of electric consumers, estimated by the load power factor, results in an increase in electricity losses and quality deterioration. To evaluate the influence of the load power factor on the transmission of active load power and to determine the quality and energy efficiency of electricity transmission through power lines, the authors analyzed the change in the parameters of one phase of a three-phase network without compensation and with reactive power compensation. The set task was solved using methods of calculation of linear electric circuits of alternating current, according to the given values of total or active load power, its resistance and the resistance of power line wires. Then the processes of power transmission in low-voltage electric networks of alternating current were simulated using the Electronics Workbench software. The authors take a case of the electric power system consisting of consumers’ (load) electric receptors receiving power supply through the power line connected to the low-voltage busbars of the power transformer. They prove that its parameters are mainly changed when changing the value of the system current determined by the load and transmission line resistances. The quality of low-voltage electrical energy transmission depends on the voltage loss in the power line wires and is determined by the load current and its full resistance. The energy efficiency of electrical energy transmission depends on the power loss in the power line wires and is determined by the amount of active power consumed by the load and the ratio of the active resistance of the power line and the load.

1. Gracheva E.I., Naumov O.V. Estimation of the magnitude of losses in electrical networks up to 1000 V. Izvestiya Vysshikh Uchebnykh Zavedeniy. Problemy Energetiki. 2003;1‑2:108‑119. EDN: RACCWL (In Rus.)

2. Polyanskiy I.A. Assessment of the effect of voltage deviation on the performance characteristics of an asynchronous electric motor. In: Fundamental science Innovation and Technology. Proceedings of the Second International Scientific and Practical Conference. Ufa, 2023:223‑235. EDN: CAZNRP (In Rus.)

3. Zaginailov V.I., Ovsyannikova E.A., Popov A.I. Assessment of energy efficiency of power plants and agricultural technologies. Doklady TSKhA. 2021;293: III:23‑26. EDN: EDN: BMAXRF (In Rus.)

4. Vorotnitskiy V.E. Reduction of electricity losses as the most important way of energy saving in electric networks. Energosberezhenie. 2014;4:45‑50. EDN: SGHVAH (In Rus.)

5. Vorotnitsky V.E., Zhezhelenko I.V., Trofimov G.G. Improving the energy efficiency of electric networks. Regionalnaya Energetika i Energosberezhenie. 2017;4:50‑52. EDN: IIHQKG (In Rus.)

6. Zaginailov V.I., Mammadov T.A., Stushkina N.A., Leshtaev O.V. Evaluation of the efficiency of an electric power system with distributed generation. International Technical and Economic Journal. 2022;4:147‑159. (In Rus.) EDN: KBEEAV

7. Leshtaev O.V., Rtishcheva N.E., Rtishchev K.P. Analysis of power supply options for a stable from a solar power plant. IOP Conference Series: Earth and Environmental Science: 3, Mining, Production, Transmission, Processing and Environmental Protection, Moscow, 2021. P. 012013. doi: 10.1088/1755-1315/808/1/012013

8. Voronin V., Gadzhiev M., Shamonov R. Development trends of the voltage and reactive power regulation system in the UNES. Electric Power. Transmission and Distribution. 2012;2:40‑48. EDN: OYMKIB (In Rus.)