TITLE:
Power Quality Issues Concerning Photovoltaic Generation in Distribution Grids
AUTHORS:
Jaan Niitsoo, Marek Jarkovoi, Paul Taklaja, Joni Klüss, Ivo Palu
KEYWORDS:
Current Measurement, Load Modelling, Photo Voltaic, Power Quality, Power System Harmonics
JOURNAL NAME:
Smart Grid and Renewable Energy,
Vol.6 No.6,
June
19,
2015
ABSTRACT: Unregulated utilization of renewable generation including residential photovoltaic (PV) systems
can have a significant impact on load characteristics in distribution networks. For improving PV
generation capabilities, power quality aspects have to be coordinated with present load characteristics.
This paper discusses the harmonic content of PV generation and the influence to power
quality indicators in residential distribution networks. PV generation measurement results including
current harmonic amplitude and phase angle values are presented. Results of different
modelling scenarios are analysed and a simplified model of harmonics in PVs is offered. The results
of the study showed a moderate additional harmonic distortion in residential load current
and voltage distortion at the substation’s busbar when PVs were added. Novelty of the paper is
that harmonic current values at higher orders are presented and analysed. The results pointed out
in this paper could be further used for modelling the actual harmonic loads of the PVs in distribution
networks.