Local photovoltaic reactive power controller for increasing active distribution networks hosting capacity

Melike Selcen Ayaz, Mostafa Malekpour, Rasoul Azizipanah-Abarghooee, Vladimir Terzija

Research output: Contribution to journalArticlepeer-review

Abstract

The photovoltaic (PV) hosting capacity of active distribution networks is usually restricted by network overvoltage atpeak PV generation hours. In the literature, several methodologies are presented to mitigate this problem caused by PVsreactive power regulation. However, the feeder transformer's thermal limit and branch lines loading confine the PVs reactivepower capability. This study proposes a fully local reactive power regulation strategy enabling the PV systems to increase thefeeder hosting capacity without using communication infrastructure. In the suggested framework, the distribution feeder ispartitioned into several zones based on the feeder's electrical bottlenecks from the perspective of lines loading condition. ThePV units placed in the vicinity of the electrical bottlenecks are equipped with the proposed local controller to moderate burdenon the corresponding bottlenecks. Other PV units support the network voltage using a conventional local voltage-dependentreactive power controller. Consequently, the feeder hosting capacity can be enhanced while equipment loadings remain in theirpermissible limits. Moreover, the network power loss is decreased due to the local reactive power management. Furthermore,the proposed approach provides superior coordination between the PV systems controller and the transformer feeder tapchanging mechanism. The advantages of the proposed approach are demonstrated by simulation results on 33-and 69-noderadial and meshed distribution feeders.

Original languageEnglish
Pages (from-to)5152-5163
Number of pages12
JournalIET Generation, Transmission and Distribution
Volume14
Issue number22
DOIs
Publication statusPublished - 13 Nov 2020
Externally publishedYes

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