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Analysis of energy quality in power supply systems with grid-connected solar power plants

The article presents an analysis of the quality of voltage at a consumer of electricity in power supply systems with a network solar power plant connected in parallel to the centralized network. The legislative base of the Russian Federation, regulating the construction and operation of grid solar power plants, requirements for the quality of energy in a centralized grid have been studied. The block diagram of the operating experimental solar power plant is presented. On the basis of this station, experimental studies of the influence of the operation of a solar power plant on the quality of energy at the consumer have been carried out. This study was carried out using a Fluke 345 power quality analyzer. The authors analyzed the experimentally obtained data on voltage changes and harmonic distortions at the consumer in two series of experiments (with a solar power plant in operation and with a solar power plant disconnected). On the basis of the analysis, conclusions were drawn about the reduction of peak voltage deviations at the consumer and a decrease in the total harmonic distortion factor when the solar power plant is operating. The relationship between voltage and harmonic distortion is described mathematically. Based on the results of the studies, conclusions were drawn about improving the quality of energy for an agricultural consumer when supplied with electricity from a grid solar power plant in parallel with a centralized grid.