In this article is represented the results of modeling the work of a solar power station under mixed sky conditions (cloud passes over its plane) in software written in Python programming language. As the issue of cost-effectiveness is a decisive one, it is necessary to provide specialists in the design and maintenance of solar power stations as accurately as possible with regard to the predicted station power. In this paper, we presented the way to take into account spatial arrangement and cloud cover in the calculation of solar power station parameters. The algorithm, based on the method that Fournier proposed, is modified to generate fractal cloud for simulating surface horizontal irradiation variability. Steps of the algorithm are presented. The modified algorithm allows us to get a “surface” of the fractal nature, which is a simulation model of the cloud. The algorithm is used to overcome the problem of obtaining sufficiently detailed for the needs of modeling cloud images of low-resolution source data. The model of a cloud is based on the assumption that the clouds are of “fractal nature”. For the chosen formula for calculating the expected intensity of solar radiation, the formula for the transition from cloudiness indices to atmospheric transparency indices is given. The normal projection of the cloud as a two-dimensional array of data represented by atmospheric transparency indices is shown. The program window for simulating the work of the solar power plant and the description of the blocks, from which it is composed, is presented. The main blocks of the program, such as Load Parameters Block, Panel Parameters Block, PV Station Structure Block, Cloud Cover Block, and Cloud Passage Block, are described. For each of the parameters of the model reference information describing the parameter is displayed. To launch the program after data entry, the transition to the modeling menu (Modeling), followed by pressing Run (Ctrl + F9) is made. If there are no errors in the entered data, a simulation window opens. If there was an error when entering the data, then the corresponding message will appear in the program`s status bar. A formula for calculating the power output of a solar power station under the condition that a cloud passes over its surface and a graph of the power curve for specific model parameters are presented. It is shown that the developed program allows obtaining data on the power output of a solar power station in dynamics, which can later be used in the design and maintenance of solar power plants.
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