The effect of snowfall and icing on the sustainability of the power output of a grid-connected photovoltaic system in Konya, Turkey

When the module surface is covered with various factors such as snow and icing which prevent the solarirradiance from reaching the photovoltaic cells, the power production of the system and its performance decrease. Thepurpose of this study is to determine the energy production losses of a grid-connected photovoltaic plant due to snowfalland icing. The effect of snowfall and icing has been examined on a photovoltaic system consisting of a hybrid inverterwith two separate maximum power point tracking inputs and 36 monocrystalline modules, which are mounted on thesupporting system horizontally in the south direction and at a constant tilt angle of 30 ◦. The plant area is located in apriority and snowy region (Konya,Turkey) where large-scale photovoltaic system installations are carried out. In orderto evaluate the effect of snowfall, the minute resolution data of the hybrid inverter which provides connection to the gridis used. The change over time of the power generated by the two arrays of the plant was examined comparatively. Forcomparison, one of the arrays was continuously cleared. The recorded data was used to determine the expected energyoutput of the array covered with snow. Besides, the solar irradiance and ambient temperature data obtained from themeteorological station were used to accurately identify and evaluate the effects of snowfall with digital images recordedin the site area.The results showed that surface clearing of modules had a significant positive effect on the power output of thesystem. In the array entirely covered with snow, the daily energy loss exceeds 93%. In months of heavy snowfall, themonthly energy loss is 18% depending on time of being covered with snow of the modules. When the production dataof 2017 and 2018 is evaluated, it is seen that the total energy loss of the plant varies between 1% and 2%.

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[1] Bergauer-Culver B, Jäger C. Estimation of the energy output of a PV power plant in the Australian Alps. Solar Energy 1998; 62 (5): 319-324. doi: 10.1016/S0038-092X(98)00016-4
[2] Klise GT, Stein JS. Models used to assess the performance of photovoltaic systems. Albuquerque, NM, USA: Sandia National Laboratories, 2009.
[3] Pašičko R, Branković Č, Šimić Z. Assessment of climate change impacts on energy generation from renewable sources in Croatia. Renewable Energy 2012; 46: 224-231. doi: 10.1016/j.renene.2012.03.029
[4] Wirth G, Schroedter-Homscheidt M, Zehner M, Becker G. Satellite-based snow identification and its impact on monitoring photovoltaic systems. Solar Energy 2010; 84 (2): 215-226. doi: 10.1016/j.solener.2009.10.023
[5] Marion B, Rodriguez J, Pruett J. Instrumentation for evaluating PV system performance losses from snow. Golden, CO, USA: National Renewable Energy Laboratory, 2009.
[6] Dekker J, Nthontho M, Chowdhury S, Chowdhury SP. Investigating the effects of solar modelling using different solar irradiation data sets and sources within South Africa. Solar Energy 2012; 86 (9): 2354-2365. doi: 10.1016/j.solener.2012.05.007
[7] Townsend T, Powers L. Photovoltaics and snow: An update from two winters of measurements in the sierra. In: IEEE 2011 37th Photovoltaic Specialists Conference; Seattle, WA, USA; 2011. pp. 003231-003236.
[8] Marion B, Schaefer R, Caine H, Sanchez G. Measured and modeled photovoltaic system energy losses from snow for Colorado and Wisconsin locations. Solar Energy 2013; 97: 112-121. doi: 10.1016/j.solener.2013.07.029
[9] Ryberg D, Freeman J. Integration, validation, and application of a PV snow coverage model in SAM. Golden, CO, USA: National Renewable Energy Laboratory, 2015.
[10] Powers L, Newmiller J, Townsend T. Measuring and modeling the effect of snow on photovoltaic system performance. In: IEEE 2010 35th Photovoltaic Specialists Conference; Honolulu, HI, USA; 2010. pp. 000973-000978.
[11] Zentgraf E. Studies on Clearing PV Modules from Snow Increasing Current Yields. Waldaschaff: TEC-Institut für technische Innovationen, 2011.
[12] Heidari N, Gwamuri J, Townsend T, Pearce JM. Impact of snow and ground interference on photovoltaic electric system performance. IEEE Journal of Photovoltaics 2015; 5 (6): 1680-1685. doi: 10.1109/JPHOTOV.2015.2466448
[13] Becker G, Schiebelsberger B, Weber W, Vodermayer C, Zehner M et al. An approach to the impact of snow on the yield of grid connected PV systems. In: European Photovoltaic Solar Energy Conference; Dresden, Germany; 2006. pp. 2732-2735.
[14] Yılmaz Ş, Özçalık HR. Performance analysis of a 500-kWp grid-connected solar photovoltaic power plant in Kahramanmaraş. Turkish Journal of Electrical Engineering & Computer Sciences 2015; 23 (6): 1946-1957. doi: 10.3906/elk-1404-157
[15] Ekici BB. Variation of photovoltaic system performance due to climatic and geographical conditions in Turkey. Turkish Journal of Electrical Engineering & Computer Sciences 2016; 24 (6): 4693-4706. doi: 10.3906/elk-1404-341
[16] Günal N. Snowfall, snow cover duration and snow line elevation in Turkey. Acta Turcica 2013; 5: 1-13 (in Turkish with an abstract in English).
[17] Fillion RM, Riahi AR, Edrisy A. A review of icing prevention in photovoltaic devices by surface engineering. Renewable and Sustainable Energy Reviews 2014; 32: 797-809. doi: 10.1016/j.rser.2014.01.015
[18] Andrews RW, Pearce JM. Prediction of energy effects on photovoltaic systems due to snowfall events. In: IEEE 2012 38th Photovoltaic Specialists Conference; Austin, TX, USA; 2012. pp. 003386-003391.
[19] Anadol MA, Erhan E. Determination of power losses occurring due to snowfall based on grid-connected inverter data. In: International Advanced Researches & Engineering Congress; Osmaniye, Turkey; 2017. pp. 1073-1080.