The paper deals with electromagnetic disturbances in the form of current higher harmonics, which are generated by LED lighting elements. It presents the problems related to the formation and impact of higher harmonics in the electrical systems of commercial facilities. The results of tests and analyses of current distortions for two different LED lamps are included, and these are in reference to the parameters set out in the normal applicable standards. A system was then proposed to improve the quality of energy in the mains of commercial facilities in the form of a two-stage power supply. Tests of the systems with the aforementioned LED lamps were conducted and commented upon after introduction of the two-stage power supply. The final part of the paper contains a summary of the obtained test results.
The object of the research is an agrophotovoltaic system. An analysis of the operating conditions of one of the existing solar power plants was performed and limitations of electricity generation due to its excess in the power system or due to work mode restrictions both under the normal state of the power grid and under individual emergency or repair modes were identified. This leads to an underproduction of electricity and a decrease in the efficiency of using the installed capacity of the solar power plant (SPP). Therefore, it was proposed to introduce an agrophotovoltaic system, which allows for more efficient use of land resources, it also allows us to increase the yield of agricultural crops that can be planted on the territory of a solar power plant, to eliminate restrictions on the delivery of generated power to the power grid through its direct consumption at the site of the SPP. The feasibility study of the project of an agrophotovoltaic system based on the existing power plant shows that its payback period will not exceed 3 years, and the profit for the 5th year of exploitation of such a system will be up to € 279409.
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