Motors powered directly from solar panels are becoming more and more popular in pump applications. However, solar panels can be the source of operational issues due to varying irradiance, ambient temperature, weather. This paper shows how it is worth expanding a solar induction motor drive to provide an uninterrupted flow of electricity to the motor. In addition, the main components of the uninterruptible induction motor drive are presented, including the LLC (inductor-inductor-capacitor) converter, the three-phase inverter, and the three-phase rectifier. LLC converters that can increase the voltage from 25–40 V to 330 V cannot be bought directly from manufacturers. Therefore, a custom LLC converter was made for the research. It was necessary to build a custom converter to avoid the use of solar panel strings. This way, solar panels connected in parallel can be used. A low-voltage (25–40 V) supply was implemented from the solar side, while the induction motor requires 230 V AC three-phase voltage in delta connection. For this reason, a voltage boost is required from the low voltage side. The grid feeds the universal DC link through the three-phase rectifier. This allows the motor to consume varying amounts of electricity from the grid or the solar panel. The study also presents in detail the LLC converter that performs the voltage boost. Measuring the entire motor drive, switching transients and efficiencies can be observed at different input voltages for different supplies as well as loads.

This paper presents a comprehensive inspection of a 10.044 MWp solar power plant that had operational problems. The condition assessment was necessary because the power plant was constantly producing electricity significantly below the expected peak power. The research confirmed that the cause of the decrease in performance is the pollution from the industrial park and the conventional power plant located next to the solar system. The accuracy of the results is confirmed using on-site thermal imaging at the solar power plant and laboratory tests. During the laboratory tests, the electrical performance of 1063 solar panels was examined as well as their damaging and life-reducing effect with further thermography tests. Surface dirt deposition cause several significant problems during energy generation. Power outages are a minor problem, and sustainable production is the main goal in the long term. If the failure and destruction of the solar modules cause more serious damage, the lifetime of the photovoltaic power plants can be shortened.

A tanulmány egy szünetmentes aszinkron motoros hajtást mutat be, amely egy szigetüzemű napelem invertert is tartalmaz. A cikk kiemeli a két rendszer kombinálásának előnyeit és a szükséges rendszerelemeket. Ezenkívül bemutatja a teljes harmonikus torzítást és a működési paramétereket a különböző rendszertopológiákban. Az eredmények MATLAB szimuláció alapján jöttek lére.

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The increase in the popularity of uninterruptible induction motor drives has prompted industrial applications to be interested in this technology. Each of these drives has a rectifier at the input that charges batteries. When there is a power outage, an inverter powered by the batteries supplies the motor with electricity. In addition, a separate system of uninterruptible power supplies is regularly installed on the industrial site. The study highlights the advantages of combining the two systems and demonstrates them with simulation and measurement results. This paper will consider connecting solar panels to combined uninterruptible power systems. Solar panels can be used to charge batteries with high efficiency, requiring only MPPT controllers. Hence, if solar panels are installed on the roofs of industrial facilities, they can be integrated into the uninterruptible power supply. The paper describes the effects of combining an uninterruptible motor drive with a single-phase inverter that mainly affects the DC bus voltage. In turn, the DC bus voltage ripple and fluctuation also affects the quality parameters of the motor and single-phase load such as the Total Harmonic Distortion. Furthermore, the paper presents the solar-assisted combined system components used for the measurement, and the results derived from them.