NDLI: Evaluation of voltage imbalance on low-voltage distribution networks considering delta-connected distribution transformers with a symmetrical NGS

Content Provider	IET Digital Library
Author	Liao, Rih Neng Yang, Nien Che
Abstract	The main purpose of this study is to evaluate the effect of distribution transformers with a delta-connected neutral-grounded structure (NGS) on the voltage imbalance of low-voltage distribution networks. The proposed NGS for delta-connected distribution transformers has a symmetrical structure. That is, the stability and reliability of the operating characteristic of the proposed delta-connected NGS are better than other grounding methods such as corner-grounding, mid-tapped grounding, a zig–zag grounding transformer, and an asymmetrical NGS. In this study, the coupling-free equivalent circuit mathematical models for various methods of grounding a delta-connected structure are first developed. Furthermore, these coupling-free equivalent circuits can be simply implemented in the MATLAB/Simulink platform. Next, the IEEE test feeder system is used as a benchmark for verification. To determine the feasibility of the proposed NGS and evaluate its operational performance, a Monte Carlo simulation-based three-phase power-flow method was proposed to compare the operational characteristics of various grounding structures (i.e. system imbalance resulting from asymmetric load conditions or asymmetric transformer connections) such as phase-to-ground voltages, line currents, power consumption, and voltage unbalance factor. The results provide a valuable reference for distribution engineers and building technologies seeking a suitable method of grounding delta-connected power service systems.
Starting Page	1644
Ending Page	1654
Page Count	11
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 7, Apr (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.0631
Journal	IET Generation, Transmission & Distribution
Publisher Date	2017-12-05
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Coupling-free Equivalent Circuit Mathematical Model Delta-connected Distribution Transformers Delta-connected Neutral-grounded Structure Delta-connected NGS Operating Characteristic Reliability Delta-connected NGS Operating Characteristic Stability Distribution Network Earthing Equivalent Circuit Grounding Delta-connected Power Service System Grounding Structure Operational Characteristic IEEE Test Feeder System Load Flow Low-voltage Distribution Network MATLAB/Simulink Platform Monte Carlo Method Monte Carlo Simulation-based Three-phase Power Flow Method Power Distribution Protection Power Distribution Reliability Power System Protection Power System Stability Power Transformer Reliability Symmetrical NGS Transformer And Reactors Voltage Imbalance Evaluation
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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