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INVESTIGATION OF THE TRANSITION PROCESS OF PARALLEL OPERATION OF A SOLAR POWER PLANT AND THE GRID UNDER EMERGENCY DISTURBANCE
Abstract
Solar energy, as one of the types of green energy, is widely studied by researchers from different regions of the world. Practice shows that the generation of clean energy at solar power plants (SPP) is not always constant, and depends on some external factors, for instance, weather conditions, emergency disturbances, etc. Parallel operation of the solar power plant and the grid eliminates some problems, in particular, fluctuations in the frequency of current due to a shortage/excess of electricity, as well as the use of batteries. Therefore, an infinite power grid is a large accumulator that can compensate for such fluctuations. This paper deals with the analysis and investigation of electromagnetic transients during a parallel operation of the SPP and the grid under a short-circuit disturbance. A block diagram and mathematical model of the SPP are developed in the MATLAB package together with Simulink and Power System Blockset. Dynamic and static modes of the parallel operation of the SPP and the grid are analyzed. Waveforms of voltages and currents at the inverter output during a three-phase short circuit are given. The developed model supports the analysis of currents, voltages, and capacities while various disturbances are simulated.
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