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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 31229

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Validation of Solar PV Inverter Harmonics Behaviour at Different Power Levels in a Test Network
Grid connected solar PV inverters need to be compliant to standard regulations regarding unwanted harmonic generation. This paper gives an introduction to harmonics, solar PV inverter voltage regulation and balancing through compensation and investigates the behaviour of harmonic generation at different power levels. Practical measurements of harmonics and power levels with a power quality data logger were made, on a test network at a university in Germany. The test setup and test results are discussed. The major finding was that between the morning and afternoon load peak windows when the PV inverters operate under low solar insolation and low power levels, more unwanted harmonics are generated. This has a huge impact on the power quality of the grid as well as capital and maintenance costs. The design of a single-tuned harmonic filter towards harmonic mitigation is presented.
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[1] Y. Du, D. Lu, G. James, D. Cornforth. 2013. Modeling and analysis of current harmonic distortion from grid connected PV inverters under different operating conditions. Solar Energy 94 (2013). pp.182–194.
[2] M. Patsalides, D. Evagorou, G. Makrides, Z. Achillides, G. E. Georghiou, A. Stavrou, V. Efthimiou, B. Zinsser, W. Schmitt and J.H. Werner. 2007. The effect of solar irradiance on the power quality behaviour of grid connected photovoltaic systems. The Renewable Energy & Power Quality Journal (RE&PQJ). RE&PQJ, Vol. 1, No.5, March 2007. ISSN: 2172-038X: 323-330B.
[3] B. G. Salvatierra, D. H. Domínguez, D. Chacon-Troya, W. H. Orozco. 2017. Power quality analysis of a low-voltage grid with a solar photovoltaic system. IEEE 30th Canadian Conference on Electrical and Computer Engineering (CCECE).
[4] A. Bachry. 2004. Power quality studies in distribution systems involving spectral decomposition. Dissertation. pp 15-17.
[5] A. Kamenka. 2014. Six tough topics about harmonic distortion and power quality indices in electric power systems.
[6] M. Juamperez, G. Yang. S. Kjaer. 2016. Voltage regulation in LV grids by coordinated volt-var control strategies. J. Mod. Power Syst. Clean Energy (2014) 2(4). pp 319-328.
[7] M. Zuercher‐Martinson. 2017. Harmonics and noise in photovoltaic (PV) inverter and the mitigation strategies. White Paper. Soonwook Hong, Ph. D.
[8] S. Hasan. 2017. Reactive power control for voltage management. January 2017.
[9] R. Nazira, K. Kanadaa, Syafiia, P. Coveria. 2014. Optimization active and reactive power flow for PV connected to grid system using Newton Raphson method. 2nd International Conference on Sustainable Energy Engineering and Application, ICSEEA 2014.
[10] B. Chhaya, B. Shukla. 1999. Power quality: Harmonics in power systems. California State University, Sacramento, 1998.
[11] H. Akagi, H. Akagi and K. Wada. 1999. A shunt active filter based on voltage detection for harmonic termination of a radial power distribution line. IEEE Transactions On Industry Applications, vol. 35, no. 3, May/June 1999.
[12] A. Puzynyth, 2014. A study of the harmonic content of distribution power grids with distributed PV systems. June 2014.
[13] J. Thongpron, U. Sangpanich, 2004. Study of a PV grid connected system on its output harmonics and voltage variation. Asian J. Energy Environ., Vol. 5, Issue1, (2004). pp 59-73.
[14] J. Schlabbach, L. Kammer. 2006. Prediction of harmonic currents of PV inverters using measured solar irradiation data. IEEE MELECON. 16-19 May 2006. Spain.
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