Evaluation of photovoltaic systems for voltage quality

Şengül, Deniz
Because of the governmental incentives and developing photovoltaic technology, the distributed photovoltaic systems are populating rapidly in power systems. This rapid population brings with concerns about voltage quality of the power systems. This thesis aims to evaluate the effects of those plants to the voltage quality of power systems in terms of voltage regulation and flicker. The thesis develops a statistical analysis method by developing metrics for a photovoltaic power plant located in Ankara, using power generation data. The generation data involves all uncertainty associated with weather conditions as well as environmental factors. Therefore, it provides a complete statistical analysis of the feasibility of photovoltaic systems at the considered region, and hence its effects to the voltage quality. In the literature, researchers are investigating the photovoltaic system generation to forecast the generation assuming it depends on certain variables as temperature and humidity. Considering the inaccuracy of those models and unknown parameters such as air pollution, ground reflection, etc. the thesis employs historic power generation data for the analysis. Besides the developed analysis method, the thesis also presents vi a bad-data identification method to eliminate the erroneous and outlier data before the statistical analysis. The study is conducted using historic data gathered from the photovoltaic system located at the Department of Electrical and Electronics Engineering. To validate the obtained results, reliability of the generation is investigated in simulation environment. The results are assessed using voltage regulation and flicker as considered metrics.


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Citation Formats
D. Şengül, “Evaluation of photovoltaic systems for voltage quality,” M.S. - Master of Science, Middle East Technical University, 2018.