OPF -based CVR Operation in PV-Rich MV-LV Distribution Networks

Luis Daniel Gutierrez Lagos, Luis(Nando) Ochoa

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    Abstract

    Conservation Voltage Reduction (CVR) has been traditionally applied adopting moderate settings at primary substations and when distributed generation was uncommon. However, as new infrastructure is deployed across European-style MV and LV networks, driven by increasing photovoltaic (PV) penetration levels, the opportunity arises to develop more advanced CVR schemes. This work proposes a centralized, three-phase AC OPF-based CVR scheme that, using monitoring, on-load tap changers (OLTCs) and capacitors across MV and LV, actively manages voltages to minimize energy consumption, even with high PV penetration, whilst considering MV-LV constraints. To tackle scalability issues brought by discrete variables, a two-stage approach is proposed to solve the OPF as a non-linear programming problem (relaxing integer variables). A process that continuously checks customer voltages is adopted to trigger the optimization only when needed. Moreover, CVR benefits are not only quantified at a network level but also for customers, providing useful insights to policy makers. The proposed control is assessed using a realistic, unbalanced UK residential MV-LV network (2,400+ customers) with high PV penetration, and 1-min resolution time-varying profiles and load models. Results demon-strate that the proposed control effectively coordinates voltage regulation in MV and LV levels throughout the day, minimizing energy imports for all customers.
    Original languageEnglish
    JournalI E E E Transactions on Power Systems
    Early online date23 Jan 2019
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Conservation voltage reduction
    • distribution networks
    • on-load tap changers
    • optimal power flow
    • PV systems

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