The article is devoted to the thyristor voltage regulator (TVR) development. The TVR purpose is to control power flows and regulate voltage in 6-20 kV distribution electrical networks (DEN). The principle of TVR operation is based on the plus EMF (or minus EMF) introduction into power line when the shared use of longitudinal (change of magnitude) and transverse (change of phase) voltage regulation. The description of the TVR prototype is given. The TVR prototype consists of a 0.4 kV thyristor switches, power transformers (shunt and serial) and a 6 kV switchgear. The TVR has a two-level control system (CS). The TVR prototype experimental research was conducted in four stages: check of power equipment, first level CS research, second level CS research, prototype tests as a whole. The connection diagrams (thyristor switches unit, transformer and measuring equipment) and contact connections reliability were checked when the power part was tested. A qualitative characteristic of the input and output signals was obtained when testing the first level CS. It is found that the thyristor control pulses are formed according to the developed algorithm. The correctness of control system algorithms, executed and transmitted commands, passed and received data was confirmed as a result of the second level CS tests. The TVR research results indicate that the prototype provides the smoothness and specified accuracy of voltage regulation in all modes. The control range of the output voltage relative to the input was ±10%. The discreteness of regulation did not exceed 1.5%. The range of change in the shift angle of the output voltage relative to the input was ±5°. Research confirmed the TVR ES operability and its readiness for trial operation.
The article considers the problems, promotion and support of the export potential of agricultural products at the regional level, which should become the next growth point for Russian agriculture. The practice of the last decade in the agricultural sector of Russia shows a significant transformation from the predominance of food imports to the realization of export potential. So, in the Orel region, the export of agricultural products tends to increase; in 2019, agricultural products were exported at $ 88.8 million (growth by 2017 was 24.8%). The leading position in the export structure of Orel agribusiness is wheat, an important direction of regional export is also given to oil and oilseeds, which are the fastest growing industries on the world market, and the Orel region contributes to their development. Despite the reduction grain crops areas in the Orel region, the forecast for the harvest of 2020 is 3 million tons. The Orel region sees the main task of the agro-industrial complex in reaching the total gross harvest of crop production in the amount of 3.7 million tons, which will provide jobs, processing raw materials. The list of directions of state support for export of agricultural products is given. The conclusion is drawn about the most significant prospects for the export potential of agricultural products at the regional level, where its further development is laid. The article emphasizes the need to stimulate the activities of exporters of agricultural products through reducing the cost of exported products.
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