Optimal voltage control strategies for day-ahead active distribution network operation

M. Z. Degefa, M. Lehtonen, R. J. Millar, A. Alahäivälä, E. Saarijärvi

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)


The aim of this study is to develop a coordinated day-ahead voltage control strategy for an active distribution network. A framework comprising a synergy of real-time dynamic thermal rating (DTR) and coordinated voltage control (CVC) is proposed for solving voltage quality and thermal limit problems associated with a high penetration level of DGs in an active distribution network. The CVC scheme involves solutions such as On-Load-Tap-Changers (OLTCs), active and reactive power control of DGs and switchable shunt VAR compensation devices (SVCs). Loss minimization and voltage penalty objective functions in the CVC optimization problem are compared. A 147 bus test distribution network planned for an actual geographical location is used to evaluate the proposed DTR-based day-ahead CVC strategy. In this study, we have showed that the reactive power absorption /injection potential of DGs can play important role in CVC. Moreover, the study demonstrates that real-time thermal rating boosts the utilization of reactive power resources in the distribution system. Finally, the study investigates the practicality of day-ahead active distribution network operation planning for CVC.
Original languageEnglish
Pages (from-to)41-52
Number of pages12
JournalElectric Power Systems Research
Publication statusPublished - Oct 2015
MoE publication typeA1 Journal article-refereed


  • Active network management, distributed generation (DG), dynamic thermal rating (DTR), load forecasting, onload tap changer (OLTC), reactive power control, state estimation, voltage control


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