Search

In 10 kV electrical distribution networks, many power transformers have been in operation for more than 25 years, which exceeds their passport life and in conditions of rapid growth of power generated by photovoltaic stations can cause a decrease in the reliability of these networks. Therefore, it is necessary to improve the quality of modern means of determining the technical condition of such transformers. It is proposed to determine the defective node of the transformer by comparing the current frequency response of the studied transformer with the sample, which is obtained by averaging the values of the frequency characteristics of other transformers, the same type with the test.

Analyses of trends increasing annual wind power plant capacity and power generation in the World and Europe are presented in this paper. Investigated main problems of increasing the power generation of renewable energy sources in distributed power grids. Proposed ways to decide them by taking into account the supply of power balance, reliability operating of the power grid, and electric power quality. Observed the daily power generation during the 2019 year for typical onshore wind power plant, which consists of 1 turbine type V-100/2.00 MW. The influence of the meteorological factors on the power generation of RESs was determined with usage Spearman's rank correlation coefficient.

The results of the study of the influence of active power produced by solar power plants (SPP) on voltage 0.4 kV tires of consumers are presented. It is proved that in local electrical systems: there are possible modes when the voltage on the 0.4 kV bus of consumers can be outside the normalized values; almost without limiting the generation of active power SEP and regulating reactive power SPP is the ability to regulate the voltage on 0.4 kV tires consumers, to prevent excess normalized voltage deviations. This will reduce the use of voltage transformers and switching devices for static capacitors.