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.

The paper refers to the development of computer model, which allows to iteratively calculate the maximum power capacity of the three-phase overhead or cable power line. The model considers two factors, which coexistence is known for complicating estimations of the power, consumed by the load, namely: impedance of the grid voltage source and static load characteristics (VI or VAR curves). The modelling of the load as current source, which current is a function of the voltage magnitude at the power line output, allowed to consider static (V-I) characteristics of the load. The model was implemented in the Simulink environment, which iterative nature of calculations allows to converge the grid output and load input voltages and currents after the transient, and therefore to consider parameters of the steady-state operation as sought-for solution.

In the article the impact of phase unbalance and harmonics in the three-phase four-wire electrical network was carried out. The electrical network in the object is investigated. Some statements were revealed: the unbalance of network; phase currents spectrum contains significant harmonics; neutral wire current is much higher than the value of the phase currents; the necessity of creating a criterion for choosing the compensating device.

To develop new control algorithms for controlling slurry pumps, it is necessary to have a reliable mathematical model of their operation, convenient for computer simulation implementation. Therefore, the paper discloses a mathematical model of the joint operation of a centrifugal pump with a controlled asynchronous motor drive and a slurry pipeline. The results of transient modes computer simulation, carried out via the xcos application of the scilab software, are presented. This software is a freeware one and, therefore, available free of charge to most researchers. The paper provides an example of verification of the adequacy and performance of the proposed computer model, with the use of characteristics of the centrifugal slurry pump GrAT-225-67-3-2-2. The said model of a centrifugal pump is efficient and can be used during the study of dynamic processes in pipeline transportation systems, as well as in the synthesis of control algorithms for electric drives of pumping units.

In order to increase the efficiency of implementing the emergency response measures, the emergency response plan drawing up, revision and implementation at oil production enterprises, it is expedient to use an analogue of the supervisory control and data acquisition (SCADA) system, which...

This paper describes a development in the area of non-contact measurement of moving flows, including mass flow, the number of components and their mass ratios in a multicomponent flow, as well as measurement of flows based on algorithms and functional developed for various industries and production processes. The paper demonstrates that at the core of the proposed systems, there is the physical information field created in the cross section of the moving flow by hard electromagnetic radiation. The substantiation and measurement of the information parameters are performed by the hardware and the software of the automatic measuring system. A new way of statistical pulsation measurements by the radioisotope technique is described, being alternative to the existing stream control methods and allowing improving accuracy of measurements. The basic formula fundamental for the method of calibration characteristics correction is shown.