Development of New Quadratic DC-DC Converters for Renewable Energy Applications: DC-DC converters have been an integral part of Photovoltaic (PV) systems, and Electrical vehicle (EV) applications. In the literature, several types of DC-DC converters are available; however, the quadratic gain DC-DC converters have gained more attention recently due to their advantages like wide range voltage gain and low electric stress. Therefore, this study introduces various systematic methodologies to develop new quadratic buck-boost converters. In addition, high quadratic gain boost converters are proposed for high step-up applications. Further, an intensive analytical and steady-state analysis is conducted to understand the performance of these converters. Furthermore, the MATLAB SIMULINK-based simulation is conducted and validated through experimental prototypes of proposed converters. Additionally, the dynamic analysis is performed by using a closed-loop operation with a TMS320F28379D microcontroller.
Reliability Analysis of Power Electronic Converters: Reliability has been an essential aspect of power electronics due to its importance in designing and deploying the power electronic system. In the power electronic converters, the semiconductor switch and capacitor are the most vulnerable components to failure. The failure criteria of these components are generally related to temperature variations due to operational and environmental parameters. In this study, the reliability of power electronic converters has been studied using different techniques like constant failure methods, and physics of failure methods. Further, a method is proposed for an accurate lifetime estimation of a two-stage grid-integrated PV system.
Development of High Gain Photovoltaic Microinverters: In order to integrate small power PV into the conventional electric grid, a microinverter offers many advantages over string inverters; thus, the development of new microinverters has taken significant attention recently. This work focuses on deriving novel non-isolated single-stage high-gain PV microinverters. In this regard, this work has developed four new quadratic gain PV microinverters, and these topologies operate in continuous conduction mode; moreover, they do not have leakage current issues as they offer common ground between the PV panel and the grid. Besides, some topologies have continuous input current which reduces the size of the PV capacitor. All these topologies are analyzed mathematically and are verified through simulations and experimentations.
Analysis on Torque Ripple of PWM Inverter Fed Induction Motor Drive: The speed-control of induction motor drives needs a pulse width modulated inverter. The pulsed output voltage of the PWM inverter results in harmonics along with the fundamental component. These harmonics generate corresponding flux and current harmonics, which leads to torque ripple. The PWM schemes have a significant influence on the pulsations in the torque developed by the motor. Therefore, in this work, I have studied the performance of torque ripple with respect to conventional and advanced space vector modulation techniques.
Development of Quadratic Bidirectional converters: Bidirectional DC-DC converters are pivotal in energy storage systems due to their ability to control energy flow bidirectionally between storage elements and the main DC bus. Their importance lies in enabling efficient energy transfer, voltage matching, and regenerative braking. These converters also facilitate grid integration, emergency backup, and system flexibility. Overall, they play a crucial role in enhancing system efficiency, reliability, and performance across various energy storage applications. Therefore, this work focuses on developing non-isolated bidirectional DC-DC converters, that produce wide-range quadratic voltage gain in both forward and backward operating modes.
Development of Fault-Tolerant Multilevel Inverter: Fault-tolerant multilevel inverters are crucial components in power electronic systems, ensuring continuous operation and reliability despite faults or failures. They enhance system reliability, grid stability, and fault mitigation, thereby extending the lifespan of power electronic systems. These inverters find real-time applications in renewable energy systems, electric vehicles, industrial motor drives, uninterruptible power supplies, and grid-tied energy storage systems. To sum it up, they play a vital role in ensuring reliable operation and performance in critical applications where fault tolerance is essential.
I am open to research collaborations in the above-mentioned research areas.
Contact: svknaresh@gmail.com