Voltage Rise Mitigation in Medium-Voltage Networks with Long Underground Cables and Low Power Demand

Deni Ćetković (), Josip Žutolija and Vitomir Komen
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Deni Ćetković: Faculty of Engineering, University of Rijeka, 51000 Rijeka, Croatia
Josip Žutolija: HEP—Distribution System Operator, Elektroprimorje, 51000 Rijeka, Croatia
Vitomir Komen: Faculty of Engineering, University of Rijeka, 51000 Rijeka, Croatia

Energies, 2024, vol. 17, issue 13, 1-19

Abstract: Medium-voltage (MV) distribution networks that are spread through larger territory and threatened by extreme weather conditions are sometimes formed by very long underground cable lines. In such circumstances, a significant amount of capacitive reactive power flow can be generated. If, concurrently, there is low power demand in the network, it can result in significant reverse reactive power flows and voltage rise issues. This paper proposes a general approach for analyzing and mitigating voltage rise issues and demonstrates it using an example of a real distribution network that operates under the described conditions. Previous studies that dealt with this problem did not include the allocation of multiple shunt reactors in a larger distribution network, modeling a high number of lines that create reverse reactive power flows, and modeling the main distribution transformers, which are the locations where voltage rise predominantly occurs. In this paper, we demonstrate that precise allocation and placement of multiple shunt reactors in a fully modeled, larger distribution system, including transformer models, can reduce reverse reactive power flows, thereby improving voltage in the distribution system. If hourly control of the power factor from the distributed generation unit is also implemented, the voltage can be further improved.

Keywords: voltage rise; long cable lines; shunt reactors; distributed generation power factor control; voltage profile improvement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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