IMPLEMENTATION OF 20 kV VOLTAGE NETWORK IN UKRAINE

Authors

DOI:

https://doi.org/10.20535/1813-5420.4.2022.273412

Keywords:

voltage, 20 kV networks, medium voltage networks, grounding, neutral, energy storage.

Abstract

Background  Due to the war, the medium voltage networks are in an extremely difficult condition, they have a high degree of depreciation of electrical equipment and a low level of automation. The energy system of Ukraine has a problem of modernizing medium voltage networks and transfer them to a new class of rated voltage of 20 kV.

Objective  Overall overview of 20 kV networks and organization of their topology with renewable energy sources and " energy storages ".

Methods A network model in the MatLab software package was used to study "energy accumulators". The study of the efficiency of the "energy storages" was carried out in the variability of the power to the total load, as well as the time of connection to the network.

Results  The need to transfer voltages of 6 (10) kV to a higher level of 20 kV has been proven. Various methods of grounding the neutral of medium voltage networks are considered and the most effective modes of neutral grounding for 20 kV networks are determined: through an arc suppression coil or through a resistor. A comparative analysis of networks with and without energy storage was carried out. In 20 kV networks, without the use of energy storage, energy consumption from the network and power losses will increase. When using storage devices, they are permanently connected to the network and have their own power losses. Batteries connected to a 20 kV network lead to an oscillating process that has a damping character (within 2 seconds).

Conclusions The transition from the voltage level of 6 (10) kV to 20 kV will significantly increase the efficiency of distribution networks and reduce electricity losses. The installation of energy storage in 20 kV distribution networks will allow the introduction of new intelligent systems to ensure the interests of safety, economy and energy efficiency and will create the prerequisites for the implementation of the Smart Grid concept.

References

V. V. Kyryk, B. V. Tsiganenko and A. S. Yandulsky, Distribution electrical networks with a voltage of 20 kV and the efficiency of their work, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”,Kyiv, Ukraine, 2018.

B. V. Tsiganenko, The efficiency of distribution electrical networks when increasing their voltage class, abstract for obtaining the scientific degree of Candidate of Technical Science, Kyiv, Ukraine 2017.

T. A. Short, Electric power distribution handbook, USA, 2003.

M. A. Shabad, Protection against single-phase earth faults in 6-35 kV networks, Russia, Moskov, 2007.

V. V. Kyryk, A. R. Buriak and M. S. Iskova, “Determination of the optimal value of the resistance of the neutral grounding resistor in 20 kV networks”, Bulletin of the Vinnitsa Polytechnic Institute, vol.1, no.5, pp. 96-102, 2021.

O. Humenyuk, I. Kuroyedova, R. Gavrilyuk, Development of renewable energy and creation of balancing capacities - analysis of challenges for the sustainability of the energy system of Ukraine in terms of achieving energy and climate goals, Kyiv, 2020.

Published

2023-09-18

Issue

Section

ENERGY SYSTEMS AND COMPLEXES