This paper presents a computational tool for estimating energy generated by low-power photovoltaic systems based on the specific conditions of the study region since the characteristic energy equation can be obtained considering the main climatological factors affecting these systems in terms of the symmetry or skewness of the random distribution of the generated energy. Furthermore, this paper is aimed at determining any correlation that exists between meteorological variables with respect to the energy generated by 5-kW solar systems in the specific climatic conditions of the Republic of Cuba. The paper also presents the results of the influence of each climate factor on the distribution symmetry of the generated energy of the solar system. Studying symmetry in statistical models is important because they allow us to establish the degree of symmetry (or skewness), which is the probability distribution of a random variable, without having to make a graphical representation of it. Statistical skewness reports the degree to which observations are distributed evenly and proportionally above and below the center (highest) point of the distribution. In the case when the mentioned distribution is balanced, it is called symmetric.

No abstract

No abstract

No abstract

The paper deals with electric power quality research, in the load buses of the electrical networks of oil processing plant (“Production Association “Kirishinefteorgsintez”, LLC). Measurements were carried out under conditions of operating equipment at the distribution substations of the enterprise and at the division boundary of inventory responsibility with the power-supply system at the points of power transmission from the power-supply system to the industrial consumer. Assessment of the allowed contribution to the deterioration of electric power quality showed that at the increase in the rated capacity of drives based on frequency converters over 12% of the total installed capacity of electricity receivers of oil processing plant, the maximum allowed voltage waveform distortion coefficient values at the points of power transmission will be exceeded. To implement normalizing the electromagnetic environment and lowering non-sinusoidality of voltage, proposed is a system of measures, that allows controlling electric power quality indicators within the limits, stipulated by regulatory documents, resulting to reducing the risk of penalties by the power-supply authority and large scale undersupply of products under conditions of continuous technological cycle.