Study of electricity transmission of a solar power plant into a three-phase electrical network

The development and research of the energy indicators of a solar power plant based on a block of solar panels of the Era-370W-24V-Mono type with a capacity of 110 kW and a solar hybrid inverter based on power transistors CM1200DC-34S, which transmits power to a three-phase electrical network, is presented. The control system of a hybrid inverter that transmits electric energy from solar panels with a power factor close to unity and a content of higher current harmonics less than 4 % has been developed. For Era-370W-24V-Mono solar panels, a polynomial approximation of the energy characteristics was carried out, namely the dependence of the selected power on the consumed current, which allows to improve the mode of maximum power selection from solar panels. A study of power losses in a hybrid inverter of a solar power plant was conducted, the dependence of total power losses on the switching frequency of power transistors in the mode of maximum power selection was obtained. It was determined that the efficiency of the hybrid inverter of the solar power plant ranges from 98.4 % at a PWM frequency of 1 kHz to 92.7 % at a PWM frequency of 6 kHz