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In wind energy systems, increasing system efficiency by maximizing the usage of wind speed has become an important issue. In this study, a single-phase grid-connected Maximum Power Point Tracking (MPPT) system that does not use a speed sensor or any motor control algorithm under variable wind speeds is proposed. In the proposed system, a Permanent Magnet Synchronous Generator (PMSG) is chosen as the generator, and a diode rectifier circuit is used at its output. To achieve the necessary DC bus voltage for grid connection at variable speeds, a DC-DC boost converter is included. The system is simplified by not using any motor control techniques and by employing PI and PR controllers for regulation. Additionally, the use of a diode rectifier instead of a controlled rectifier at the PMSG output reduces the system's cost and size. The proposed MPPT system, with a nominal power of 2kW and a bus voltage of 400V, was tested in simulation studies. The results demonstrated the system's performance and accuracy. [ABSTRACT FROM AUTHOR]

Photovoltaic systems, which is one of the subjects that many developed countries are working on, are used to obtain electrical energy from solar energy. Photovoltaic systems have emerged as one of the most reliable and affordable alternatives to meet energy needs. In case of meeting this energy need, examining the conditions such as partial shading depending on the time is vital for meeting the energy. The shading situation causes the power obtained to decrease significantly. As the shading rate increases, the efficiency decreases. Therefore, for different conditions, the effect of the shading situation on the power obtained must be investigated. This study was done in a laboratory environment by using solar simulator. The distance between the artificial light source and the panel is set at 0.8 m and 1.4 m, and the angle is 0 °, 20 ° and 40 °. In case of shading to the all cells and shading to 1/36, 2/36 cells, in terms of panel characteristic and change of maximum power are compared. The results showed that the maximum power obtained decreases as the distance and angle between the artificial light source and the panel increases. [ABSTRACT FROM AUTHOR]