Bio
Dr. K. Ramani is an accomplished academic and researcher in the field of Power Electronics and Drives. Currently affiliated with K.S. Rangasamy College of Technology, Tiruchengode, Tamilnadu, India, he has published extensively on multilevel inverters and photovoltaic systems. With a Ph.D. in Power Electronics and Drives, he has authored over 62 publications (45 international, 17 national) and serves as a reviewer for the Global Journal of Researches in Engineering (GJRE). He has guided 5 PhD scholars and led 3 research projects. His work includes investigations on total harmonic distortion in flying capacitor multilevel inverters and closed-loop systems for diode clamped multilevel inverters with photovoltaic input.
Educational Journey
BE., ME., Ph.D
Experience
K.S.Rangasamy College of Technology
0 - PresentResearch
An Investigation Study of Total Harmonic Distortion in a Flying Capacitor Multilevel Inverter With / Without Closed a Loop Feedback Schemes
This paper focuses on the investigation study of Total Harmonic Distortion (THD) in a sevenlevel Flying Capacitor Multilevel Inverter (FCMLI) with / without closed-loop feedback schemes. For that, a closed-loop model is designed for the existing FCMLI through this paper. Conventionally full bridge and half bridge inverter configurations are used for certain applications where DC-AC conversion is needed. But the main drawbacks of these inverters are high harmonic content and used only for limited power applications. In order to overcome this, a novel approach called closed-loop FCMLI will be proposed, which significantly increases the level number of the output waveform and thereby dramatically reduces the low-order harmonics and THD. The proposed system consists of a DC–DC power converter and a DC–AC multilevel inverter. In order to achieve low cost, easy control, high efficiency, and high reliability, a capacitor clamped DC–DC boost converter using minimal devices is introduced to interface the lowvoltage Photovoltaic (PV) module.
Implementation of Closed Loop System for Diode Clamped Multilevel Inverter with Stand-Alone Photovoltaic Input
Multilevel inverter is as one of the most recent and popular type of advances in power electronics. It synthesizes desired output voltage waveform from several dc sources used as input for the multilevel inverter. This paper describes a diode-clamped five-level inverter-based battery/super capacitor direct integration scheme for photovoltaic energy systems. The study is carried out for three cases. In the first case, one of the two dc-link capacitors of the inverter is replaced by a battery bank and the other by a super capacitor bank. In the second case, dc-link capacitors are replaced by two battery banks. In the third case, ordinary dc-link capacitors are replaced by two super capacitor banks. The first system is supposed to mitigate both long-term and short-term power fluctuations while the last two systems are intended for smoothening long-term and short-term power fluctuations, respectively. These topologies eliminate the need for interfacing dc–dc converters and thus considerably improve the overall system efficiency. The major issue in aforementioned systems is the unavoidable imbalance in dc-link voltages. An analysis on the effects of unbalance and a space vector modulation method, which can produce undistorted current even in the presence of such unbalances, are presented in this paper. Simulation work is done using the MATLAB software which validates the proposed method and finally THD comparison is presented for analysis
