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Synchrophasors-Based Distributed Secondary Voltage/VAR Control via Cellular Network

TitleSynchrophasors-Based Distributed Secondary Voltage/VAR Control via Cellular Network
Publication TypeJournal Article
Year of Publication2017
AuthorsBorghetti, A., R. Bottura, M. Barbiroli, and C. A. Nucci
JournalIEEE Transactions on Smart Grid
Date PublishedJan
Keywordscellular network, cellular radio, communication infrastructure, Communication networks, data loss, decentralised control, distributed control, distributed generation, distributed multiagent approach, distributed power generation, information and communication technology-power cosimulation platform, Inverters, invertors, load flow control, medium voltage feeder, Multi-agent systems, on load tap changers, on-load tap changer, phasor measurement, phasor measurement unit, Phasor measurement units, photovoltaic power generation, photovoltaic power systems, photovoltaic unit, Power distribution network, power generation control, PV inverter reactive power output cooperative adjustment, PV unit, reactive power, reactive power control, reactive power control capability, reactive power flow estimation, reactive power flow reduction, Resource management, secondary voltage/var control, secondary VVC scheme, Simulation, State estimation, synchrophasors-based distributed secondary voltage/VAR control, transformer tap position, Voltage control

The impact of the increasing connection of distributed generation to medium voltage feeders, with particular reference to photovoltaic (PV) units, justifies the investigation on secondary voltage/VAR control (VVC) schemes able to improve the utilization of available control resources and to reduce reactive power flows. This paper deals with a secondary VVC scheme based on a distributed multi-agent approach that requires only the estimation of the reactive power flows between the buses, where the PV units with reactive power control capability are connected. Phasor measurement units are used to get the relevant information. In general, distributed control approaches are expected to work adequately even by using communication infrastructures with lower performances than those required by centralized approaches. This paper addresses such an issue by the analysis of the distributed VVC performance when a shared cellular network is used for the cooperative adjustment of PV inverters reactive power outputs and of tap positions of transformers equipped with on-load tap changers. The analysis is carried out by using a specifically developed information and communications technology-power co-simulation platform. It is shown that the VVC scheme has adequate performances also in the presence of significant levels of background traffic and data loss.