Neutral Current Minimization Control for Solid State Transformers under Unbalanced Loads in Distribution Systems

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Title: Neutral Current Minimization Control for Solid State Transformers under Unbalanced Loads in Distribution Systems
Authors: Chen, JunruYang, TaoO'Loughlin, CathalO'Donnell, Terence Martin
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Date: 3-Dec-2018
Online since: 2019-05-27T09:42:50Z
Abstract: This paper analyses the neutral current reduction performance of a three phase four leg solid state transformer (SST) under different degrees of unbalanced load. Several kinds of control strategies are presented, the neutral current elimination controls which rely on phase shifting, voltage amplitude and phase shifting & voltage amplitude combination control. A neutral current minimization control which ensures the SST output voltages complies with the EN 50160 output voltage unbalance standard is also developed. These control approaches simply build on the balanced voltage control providing voltage references which slightly unbalanced the voltage amplitude and phase angle or both. The effectiveness of the proposed strategies is validated through tests on a downscaled prototype. Simulation results for the neutral current minimization control of the SST applied to a real urban distribution network with distributed loads are presented. The results of this analysis show that overall the neutral current minimization results in an energy saving from both reduced losses in the distribution cables and reduced power consumption in the load.
Type of material: Journal Article
Publisher: IEEE
Journal: IEEE Transactions on Industrial Electronics
Volume: 66
Issue: 10
Start page: 8253
End page: 8262
Copyright (published version): 2018 European Union
Keywords: Neutral currentSolid state transformerSmart transformerUnbalanced loadsDistribution systems
DOI: 10.1109/TIE.2018.2883266
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

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