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

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Title of host publicationSMARTGREENS 2016 - Proceedings of the 5th International Conference on Smart Cities and Green ICT Systems
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Pages1-7
Number of pages7
ISBN (Electronic)978-989-758-234-9
ISBN (Print)978-1-5090-5896-9
Publication statusPublished - 1 Jan 2016
Event5th International Conference on Smart Cities and Green ICT Systems, SMARTGREENS 2016 - Rome, Italy
Duration: 23 Apr 201625 Apr 2016

Conference

Conference5th International Conference on Smart Cities and Green ICT Systems, SMARTGREENS 2016
CountryItaly
CityRome
Period23/04/1625/04/16

Keywords

  • Distributed generation
  • Photovoltaic
  • Power quality
  • Smart grid
  • Voltage unbalance

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    Gagrica, O., Uhl, T., Nguyen, P. H., & Cobben, J. F. G. (2016). Applicability of true voltage unbalance approximation formula for unbalance monitoring in LV networks with single-phase distributed generation. In SMARTGREENS 2016 - Proceedings of the 5th International Conference on Smart Cities and Green ICT Systems (pp. 1-7). Institute of Electrical and Electronics Engineers.