Industrial Electronics
Hadi Afsharirad; Fahimeh Sadighi-Amandi; Mohamad Reza Banaei; Sara Misaghi
Abstract
The use of DFIG-DC systems without stator voltage and current sensors has gained attention due to reduced costs and simplified control. However, diode rectifiers in these systems introduce current harmonics, degrading power quality and limiting performance at higher power levels. This study proposes ...
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The use of DFIG-DC systems without stator voltage and current sensors has gained attention due to reduced costs and simplified control. However, diode rectifiers in these systems introduce current harmonics, degrading power quality and limiting performance at higher power levels. This study proposes a new structure for DFIG-DC systems, replacing the conventional two-level inverter with a T-type converter to address these issues.The proposed system uses a T-type converter to enhance voltage levels, reducing current harmonics and improving power quality. It also eliminates stator voltage and current sensors, simplifying the control system and reducing costs. Performance analysis through MATLAB/Simulink simulations demonstrated the effectiveness of the proposed system compared to conventional methods.The proposed DFIG-DC system with a T-type converter offers a cost-effective and efficient solution for reducing current harmonics and improving power quality. Its simplified control system and enhanced performance make it a promising approach for high-power applications in wind energy systems and other industrial uses. These findings highlight the system’s potential for improving reliability and operational efficiency in renewable energy and industrial applications.
Industrial Electronics
Mahdi Elmi; Mohamad Reza Banaei; Hadi Afsharirad
Abstract
The objective of this paper is to propose, study and analyze a non-isolated high step-up SEPIC-based DC-DC converter for photovoltaic applications. The proposed structure is based on the SEPIC converter and utilizes a two-winding coupled inductor along with an improved voltage multiplier cell in order ...
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The objective of this paper is to propose, study and analyze a non-isolated high step-up SEPIC-based DC-DC converter for photovoltaic applications. The proposed structure is based on the SEPIC converter and utilizes a two-winding coupled inductor along with an improved voltage multiplier cell in order to enhance the output voltage level. Moreover, a passive voltage clamp is used to reduce the voltage stress on the main switch and recover the energy stored in the leakage inductance of the coupled inductor. Hence, an active switch with low RDS-ON could be employed. Meanwhile, due to soft switching condition at turn-off instant of diodes, their reverse-recovery problems are solved. Furthermore, the presented converter has the merits such as continuous input current, high efficiency and low cost and size which make it a promising solution for photovoltaic applications. At the end, the converter is compared to different types of DC-DC converters to show its advantages over the converters designed before. In order to verify the performance of the converter, a 200-W laboratory prototype is implemented and experimental results are taken and depicted. Results prove the feasibility and functionality of the presented converter for photovoltaic systems.
