Applicability of True Voltage Unbalance Approximation Formula for Unbalance Monitoring in LV Networks with Single-phase Distributed Generation

Ognjen Gagrica, Tadeusz Uhl, Phuong H. Nguyen, J. F. G. Cobben

2016

Abstract

In the hierarchy of power transmission and distribution systems, the three-phase LV distribution networks are most susceptible to voltage unbalance (VU). The main causes are large presence of randomly distributed single-phase loads and, following the latest trends, the increasing presence of single-phase distributed generators. Most widely accepted VU calculation is based on percentile ratio of negative and positive sequence voltage (voltage unbalance factor, VUF). Obtaining sequence voltages is a complex domain calculation and requires simultaneous sampling of three-phase voltages and angles. This is why the existing VU monitoring and mitigation solutions are dominantly three-phase. Without an additional three-phase aggregation device, there is an inherent gap in VU monitoring for single-phase loads and generators. In this paper, the data concentrators for a growing PV micro-inverter niche are identified as an infrastructure that could be exploited to somewhat close this gap. Due to potential technical limitations of PV data concentrators, a non-complex VUF approximation formula is tested as a "light" calculation alternative, by comparing it against conventional VUF. The comparison results are obtained from Monte Carlo load flow simulation for an unbalanced LV network.

Paper Citation

in Harvard Style

Gagrica O., Uhl T., Nguyen P. and Cobben J. (2016). Applicability of True Voltage Unbalance Approximation Formula for Unbalance Monitoring in LV Networks with Single-phase Distributed Generation . In Proceedings of the 5th International Conference on Smart Cities and Green ICT Systems - Volume 1: SMARTGREENS, ISBN 978-989-758-184-7, pages 286-292. DOI: 10.5220/0005783202860292

in Bibtex Style

@conference{smartgreens16,
author={Ognjen Gagrica and Tadeusz Uhl and Phuong H. Nguyen and J. F. G. Cobben},
title={Applicability of True Voltage Unbalance Approximation Formula for Unbalance Monitoring in LV Networks with Single-phase Distributed Generation},
booktitle={Proceedings of the 5th International Conference on Smart Cities and Green ICT Systems - Volume 1: SMARTGREENS,},
year={2016},
pages={286-292},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0005783202860292},
isbn={978-989-758-184-7},
}

in EndNote Style

TY - CONF
JO - Proceedings of the 5th International Conference on Smart Cities and Green ICT Systems - Volume 1: SMARTGREENS,
TI - Applicability of True Voltage Unbalance Approximation Formula for Unbalance Monitoring in LV Networks with Single-phase Distributed Generation
SN - 978-989-758-184-7
AU - Gagrica O.
AU - Uhl T.
AU - Nguyen P.
AU - Cobben J.
PY - 2016
SP - 286
EP - 292
DO - 10.5220/0005783202860292