Neutral Current Optimization Control for Smart Transformer-fed Distribution System under Unbalanced Loads

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Title: Neutral Current Optimization Control for Smart Transformer-fed Distribution System under Unbalanced Loads
Authors: Chen, JunruZhu, RongwuIbrahim, IsmailO'Donnell, TerenceLiserre, Marco
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Date: 11-May-2020
Online since: 2021-08-20T17:19:30Z
Abstract: EU In a 3-phase 4-wire LV distribution system, unbalanced loads lead to neutral current (NC) looping resulting in increase of power losses and variation of neutral potential. Compared to the conventional power transformer, Smart Transformer (ST) has strict current limitations to avoid overcurrent. However, its advantages on the downstream LV grid voltage regulation can provides the capability to regulate excessive NC. This paper proposes a closed-loop NC optimization control in order to, on the one hand, minimize the NC current in the normal operation satisfying the standard EN 50160 requirement, on the other hand, suppress the NC current in extreme cases to avoid the overcurrent damage of the ST. The proposed control strategies are validated by experimental tests via the hardware-in-the-loop setup and a case study based on a 350kVA, 10kV/400V, ST-fed distribution network under unbalanced loading profile according to the 3-phase 4-wire distribution grid in Manchester area. The results clearly prove the effectiveness and flexibility of the proposed NC optimization control strategies on the NC suppression and minimization.
Funding Details: European Research Council
Science Foundation Ireland
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Journal of Emerging and Selected Topics in Power Electronics
Volume: 9
Issue: 2
Start page: 1696
End page: 1707
Copyright (published version): 2020 IEEE
Keywords: Voltage controlInvertersVoltage measurementPower transformersMinimizationStandards
DOI: 10.1109/JESTPE.2020.2993927
Language: en
Status of Item: Peer reviewed
ISSN: 2168-6777
This item is made available under a Creative Commons License:
Appears in Collections:Electrical and Electronic Engineering Research Collection

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