Point estimate method for voltage unbalance evaluation in residential distribution networks with high penetration of small wind turbines

Chao Long, Mohamed Emad A. Farrag *, Donald M. Hepburn, Chengke Zhou

*Corresponding author for this work

    Research output: Contribution to journalArticle

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    Abstract

    Voltage unbalance (VU) in residential distribution networks (RDNs) is mainly caused by load unbalance in three phases, resulting from network configuration and load-variations. The increasing penetration of distributed generation devices, such as small wind turbines (SWTs), and their uneven distribution over the three phases have introduced difficulties in evaluating possible VU. This paper aims to provide a three-phase probabilistic power flow method, point estimate method to evaluate the VU. This method, considering the randomness of load switching in customers’ homes and time-variation in wind speed, is shown to be capable of providing a global picture of a network’s VU degree so that it can be used for fast evaluation. Applying the 2m + 1 scheme of the proposed method to a generic UK distribution network shows that a balanced SWT penetration over three phases reduces the VU of a RDN. Greater unbalance in SWT penetration results in higher voltage unbalance factor (VUF), and cause VUF in excess of the UK statutory limit of 1.3%.
    Original languageEnglish
    Pages (from-to)7717-7731
    Number of pages15
    JournalEnergies
    Volume7
    Issue number11
    DOIs
    Publication statusPublished - 20 Nov 2014

    Keywords

    • voltage unbalance
    • small wind turbines
    • point estimate method

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