Optimal Voltage Control Strategy for Voltage Regulators in Active Unbalanced Distribution Systems Using Multi-Agents

Ahmed Bedawy, Naoto Yorino, Karar Mahmoud, Yoshifumi Zoka, Yutaka Sasaki

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)
621 Downloads (Pure)


The rapid increase in the installation of renewable energy sources, particularly solar photovoltaic (PV) sources associated with unbalanced features of distribution systems (DS), disturbs the classic control strategy of voltage regulation devices and causes voltage violation problems. This paper proposes an effective control strategy for voltage regulators in the DS based on the voltage sensitivity using a multi-agent system (MAS) architecture. The features of the unbalanced distribution system (UDS) with the PV and different types and configurations of voltage regulators are considered in the proposed strategy. The novelty of the proposed method lies in realizing both the control optimality of minimizing voltage violations and the flexibility to accommodate changes in the DS topology using an MAS scheme. An advantageous feature of using the MAS scheme is the robust control performance in normal operation and against system failure. Simulation studies have been conducted using IEEE 34-node and 123-node distribution test feeders considering high PV penetration and different sun profiles. The results show that the proposed voltage control strategy can optimally and effectively manage the voltage regulators in the UDS, which decrease their operation stresses and minimize the overall voltage deviation.
Original languageEnglish
Article number8844824
Pages (from-to)1023-1035
Number of pages13
JournalIEEE Transactions on Power Systems
Issue number2
Early online date19 Sep 2019
Publication statusPublished - Mar 2020
MoE publication typeA1 Journal article-refereed


  • Distribution system
  • Multi-agents
  • Renewable energy sources
  • Voltage reulation
  • Voltage violation


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