Quantification of additional asset reinforcement cost from three phase imbalance


Ma, K., Li, R. and Li, F., 2015. Quantification of additional asset reinforcement cost from three phase imbalance. IEEE Transactions on Power Systems, PP (99), pp. 1-7.

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    Uneven load distribution leads to a 3-phase imbalance at the low voltage (LV) substation level. This imbalance has distinct impacts on main feeders and LV transformers: for main feeders, it reduces the available capacity as the phase with the least spare capacity determines the usable capacity; for LV transformers, phase imbalance reduces the available capacity due to additional power along the neutral line. To assess the additional reinforcement cost (ARC) arising from a 3-phase imbalance, this paper proposes two novel costing models for main feeders and LV transformers respectively. Each model involves the derivation of an accurate ARC formula based on the degree of three-phase imbalance and a linearized approximation through Taylor’s expansion to simplify the detailed ARC formula, enabling quantification of future LV investment in scale. The developed models are tested on 4 cases where imbalance ranges from 0 to 10%, and reveals that i) a small imbalance degree may cause a substantial ARC on main feeders; ii) ARC grows exponentially as asset utilization is close to its capacity; and that iii) a main feeder is more sensitive to its respective imbalance degree than a LV transformer under the same condition. The models serve as an effective tool to assist distribution network operators (DNOs) to quantify a key cost (ARC) element from the phase imbalance, allowing DNOs to evaluate their future LV investment in scale.


    Item Type Articles
    CreatorsMa, K., Li, R. and Li, F.
    Uncontrolled Keywordsdistribution network investment,three-phase electric power
    DepartmentsFaculty of Engineering & Design > Electronic & Electrical Engineering
    Research CentresCentre for Sustainable Power Distribution
    EPSRC Centre for Doctoral Training in Statistical Mathematics (SAMBa)
    Publisher StatementQuantification_of_Additional_Asset_Reinforcement_Cost_From_Three_Phase_Imbalance_Accepted_Version.pdf: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
    ID Code48829


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