The impact of reactive power generation in PV systems on their yearly production of electrical energy

Primož Sukiè, Ernest Beliè, Mislav Trbušiæ, Gorazd Štumberger



The paper deals with photovoltaic (PV) systems able to generate reactive power and to curtail active power generation. Based on measurements performed on an existing PV system over 10 years its typical yearly operation profile is determined. It is used to evaluate the ability of the PV system to generate reactive power. After that the efficiency characteristic of a micro-inverter is
determined experimentally. It is described as a function of generated active and reactive powers. This function is afterwards used in an optimization procedure, where measured time dependent load and power generation profiles are applied to determine optimal reactive power generation in PV systems installed in an existing low voltage network. Based on calculations performed over one year, the impact of reactive power generation on yearly production of electrical energy in PV
systems is evaluated.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ),Vol. 1, Nº. 14
Pages:589-593 Date of Publication: 2016/5/20
ISSN: 2172-038X Date of Current Version:2016/5/4
REF:404-16 Issue Date: May 2016
DOI:10.24084/repqj14.404 Publisher: EA4EPQ

Authors and affiliations

Primoz Sukic, Ernest Belic, Mislav Trbusic, Gorazd Stumberger
University of Maribor, Faculty of Electrical Engineering and Computer Science. Slovenia

Key words

PV systems, micro-inverter, reactive power generation, loss of energy production


[1] E. Beliè, K. Dežan, N. Lukaè and G. Štumberger, "Reduction of energy losses achieved by an optimal reactive
power generation in photovoltaic systems installed inside a low voltage distribution network, International Conference
on Renewable Energies and Power Quality (ICREPQ’15), 2015.
[2] M. Braun, Reactive power supplied by PV invrters – costbenefit anlysis, 22nd European Photovoltaic Solar Energy
Conference and Exhibition, 2007.
[3] A. Anurag, Y. Yang and F. Blaabjerg, Impact of reactivepower injection outside feed-in hours on the reliability of
photovoltaic inverters, IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems
(PEDG), 2015.
[4] S. Sreechithra, P. Jirutitijaroen and A. Rathore, Impacts of reactive power injections on thermal performances of PV
inverters, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
[5] F. Gervasio, R. Mastromauro and M. Liserre, Power losses analysis of two-levels and three-levels PWM inverters
handling reactive power, IEEE International Conference on Industrial Technology (ICIT), 2015.
[6] K. Ma, M. Liserre and F. Blaabjerg, Reactive Power Influence on the Thermal Cycling of Multi-MW Wind Power Inverter, IEEE Transactions on Industry Applications, , pp. 922-930, 2013.