Faculty Publications
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Item Global Peak Tracking of Photovoltaic Array under Mismatching Conditions Using Current Control(Institute of Electrical and Electronics Engineers Inc., 2019) Ramana, V.V.; Mudlapur, M.; Damodaran, R.; Balasubramanian, B.; Mishra, S.Characteristics of photovoltaic arrays exhibit multiple peaks under mismatching conditions. In order to harness maximum energy, it is imperative to track the global maximum power point. A novel global peak tracking algorithm is proposed using current control in this paper. The proposed method operates in the backward phase and forward phase to track the global peak. The objective of the proposed algorithm is to track the global maximum accurately with minimum tracking time. The enhanced performance of the proposed algorithm is verified using simulations by comparing it with an existing method. Experimental validation is done using a solar array simulator, boost converter, resistive load, and dSPACE controller. Experimental results are in close agreement with simulation. The proposed algorithm is intended to track the global peak of a PV string that contains a group of modules. © 1986-2012 IEEE.Item Effect of Partial Shading on PV Fed Induction Motor Water Pumping Systems(Institute of Electrical and Electronics Engineers Inc., 2019) Mudlapur, M.; Ramana, V.V.; Damodaran, R.; Balasubramanian, B.; Mishra, S.Partial shading is one of the certain conditions in photovoltaic (PV) power plants. Often the panels get partially shaded due to soiling, clouds, and trees. The effect of shading is of high concern and importance especially in applications such as water pumps due to agricultural environments in which they are employed in. However, the research focus on PV fed pumps till date has been restricted to only uniform shading conditions. Unlike uniform shading conditions during maximum power tracking, where the panel voltage remains almost constant for an entire range of irradiance, partial shading offer conditions such as highly variable panel voltage and transitions of intermediate DC-DC power converter from continuous conduction mode to discontinuous conduction mode. These effects severely affect the performance of the power converter and, therefore, the power output of the pump. This paper presents a study on the effects caused by partial shading conditions on pumps through simulations and verified by experimentations. The simulation and experimental results are found to be in good agreement with each other. This research thus helps in understanding the detrimental effects caused by partial shading conditions and thus serves as a reference tool for practitioners who wish to study PV fed pumps. © 1986-2012 IEEE.Item High-Gain Nonisolated DC–DC Converter with Zero Input Current Ripple for Fuel Cell Electric Vehicles(Institute of Electrical and Electronics Engineers Inc., 2025) Shetty, S.; Mishra, S.; Vinatha Urundady, U.This paper presents a novel single-switch, common-ground high-gain DC–DC converter for vehicular applications, integrating a Current Mirror Ripple Cancellation Circuit (CMRCC) to achieve a continuous input current with negligible ripple. The proposed power stage incorporates one switched inductor–capacitor (SLC) cell and one switched capacitor (SC) cell, along with a clamping circuit to reduce voltage stress on the switching device, thereby enhancing efficiency and reliability. This configuration delivers high voltage gain while maintaining control simplicity through a single-switch design and minimizing electromagnetic interference via the common-ground structure. A comprehensive theoretical analysis is provided, covering voltage gain, efficiency, component stress, and open-loop stability. A 48 V/400 V, 350 W laboratory prototype was developed to validate the proposed design under dynamic load and source variations, achieving a peak efficiency of 94.4%, an input current ripple below 1%, and a transient deviation of less than 10% under 30% load and 20% source step changes. These results confirm that the proposed integrated approach offers a compact, high-performance, and application-ready solution for electric vehicle powertrains and renewable energy systems. © 2015 IEEE.