Voltage Control in PV-Rich LV Networks without Remote Monitoring

Andreas T. Procopiou, Luis F. Ochoa

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The adoption of on-load tap changer (OLTC)-fitted transformers in low-voltage (LV) networks can be a potential solution to counteract voltage rise caused by high penetrations of residential photovoltaic (PV) systems. However, to control voltages in an efficient and flexible way, observability of remote points is required. This study proposes a generic and practical remote voltage estimation method for the end points of LV feeders to substitute the need of remote monitoring without compromising performance and, hence, avoid the corresponding investment. This scheme identifies first the number of customers per phase to then produce a generic feeder. The latter is used to estimate remote voltages based on substation measurements. The performance of the proposed estimation is compared against the case with monitoring considering a rule-based OLTC control logic as well as different control cycles on a real UK residential LV network. To cater for the load and generation uncertainties a time-series Monte Carlo analysis is applied. Furthermore, different uneven PV penetrations per feeder are considered. Results show that the use of estimated voltages can be as effective as those from remote monitoring. Consequently, the proposed approach can help making the adoption of OLTC-fitted transformers in future LV networks more cost effective.

    Original languageEnglish
    Article number7514939
    Pages (from-to)1224-1236
    Number of pages13
    JournalIEEE Transactions on Power Systems
    Volume32
    Issue number2
    Early online date18 Jul 2016
    DOIs
    Publication statusPublished - 1 Mar 2017

    Keywords

    • Low voltage networks
    • OLTC
    • smart grids
    • voltage control
    • voltage estimation

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