Currently, high pressure sodium lamps are the light source in greenhouse vegetable growing. The most promising sources of artificial lighting are LED-based irradiators. They can provide a cooler temperature environment to bring plants closer to plants. The aim of the study is to determine the economic life of sodium and LED light sources in greenhouse vegetable growing, taking into account their degradation for the harvest. LEDs, like sodium lamps, degrade during use. This leads to a decrease in the light (photosynthetic photon) flux of light sources and, as a result, to a decrease in yield. Due to this certain functional dependence on the luminous flux level, the economically feasible life of the light is predicted.

Keywords: light sources, luminous flux, LED lamps, sodium lamps, productivity, energy efficiency, economy

On November 10, 2017, new requirements came into force that apply to lighting devices and electric lamps used in AC circuits. In connection with the newly introduced requirements, calculations of power consumption in educational institutions were carried out at different times of use of the lighting load. The purpose of the research is to determine the payback period for the implementation of LED lamps instead of fluorescent lamps for various types of premises in educational institutions. The analysis of technical characteristics of LED light sources offered on the market of the Russian Federation is carried out. Based on the results of the calculations, the payback periods were obtained for the introduction of LED lamps instead of fluorescent lamps for public premises, laboratories, training workshops, as well as lecture halls of educational institutions, with different times of use of the lighting load. This can allow already at the design stage to evaluate the effectiveness of the implementation of the selected light sources.

Keywords: light sources, led lamps, fluorescent lamps energy efficiency, electric lamps, lighting systems, educational institutions

A large number of power receivers with non-linear current-voltage characteristics with a pulsed mode of operation appeared in residential buildings, which leads to the generation of 0.38 kV higher harmonic current components into the electric network, large values ​​of these harmonics lead to a deterioration in the shape of the network voltage curve. The purpose of the work is to study the harmonics of current generated by electrical receivers of residential buildings, and their influence on the coefficient of non-sinusoidality of the network voltage of 0.38 kV. It has been established that the greatest negative impact on the electric network is exerted by electronic devices with switching power supplies, such as PCs, laptops and netbooks, as well as dishwashers and LED lamps with a socle E14 and E27, whose total harmonic current component coefficient is 85% ≤ THDI ≤ 205%. In the Matlab Simulink program, a simulation model of a 0.38 kV network of a residential building is simulated, which allows the study of the total distortion coefficient of the current KI and voltage KU in the ASU. With the installed non-linear load power more than double the linear load, the coefficient of non-sinusoidality of the voltage in the network of 0.38 kV may exceed the values ​​established by GOST 32144-2013.

Keywords: power supply system, electric network, quality of electric energy, voltage harmonics, current harmonics, electromagnetic compatibility, power receiver

The question of increase of efficiency of functioning of electrotechnical complexes of the agricultural enterprises due to use of power stations on the basis of solid oxide fuel elements is considered. The system of generation turns on the modular electrochemical generator on solid oxide fuel elements. The system of accumulation consists of the capacitor store and batteries. It is developed system of interface makes the converter of distribution of currents with three raising DC/DC converters and algorithm of a control system for effective functioning at integration into the centralized power supply network.

Keywords: electrotechnical complex of the agricultural enterprise, the power station on solid oxide fuel elements, the hybrid store of the electric power, the converter of distribution of currents, algorithm

The comparative analysis of the key operational and technological parameters of modern power stations of a small-scale power generation is carried out (solar, wind, biogas, on fuel elements). On the basis of the carried-out analysis recommendations about a choice of type and power of power stations are formulated.

Keywords: information database, power plants on renewable energy sources, comparative analysis