Browsing by Author "Vignesh Kumar, V."

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A Novel Algorithm Based on Voltage and Current Perturbation to Track Global Peak Under Partial Shading Conditions
(Institute of Electrical and Electronics Engineers Inc., 2022) P, P.; Vignesh Kumar, V.; Koothu Kesavan, K.K.; Balasubramanian, B.
Under partial shading conditions, photovoltaic (PV) systems exhibit multiple peaks in their power-voltage (P-V) characteristics. It is essential to extract maximum energy from the PV system. The global maximum power point tracking (GMPPT) algorithms presented in the literature, track the global peak using different methods. It is imperative to have minimal convergence time for GMPPT process. This paper proposes a novel algorithm to track the global peak using voltage and current perturbation. The new GMPPT algorithm operates in a current perturbation or voltage perturbation mode, based on the value of a control variable. In either mode, the proposed technique generates reference current or reference voltage, for navigating the operating point to GMPP location. The proposed algorithm is compared with two GMPPT algorithms, namely, modified maximum power trapezium (M-MPT) and high-performance GMPPT algorithms. The simulation studies are performed in MATLAB and is validated using a laboratory prototype, with dSPACE 1202 MicroLabBox controller for implementing GMPPT methods. Simulation and experimental results show that the new technique exhibits superior performance in terms of tracking time. Also, the energy efficiency is improved by 40% while using the proposed GMPPT algorithm for the irradiance profiles considered in this paper compared to the other two techniques. © 1986-2012 IEEE.
Design and Analysis of GaN Based Electronic Power Conditioner for Space Applications
(Institute of Electrical and Electronics Engineers Inc., 2025) Indhuja, L.R.; Vignesh Kumar, V.; Desai, N.K.; Balasubramanian, B.; Vinatha Urundady, U.; Rajan Singaravel, M.M.
This paper presents the design and analysis of a forward converter-based multi-output topology utilizing Gallium Nitride (GaN) power devices for Electronic Power Conditioner (EPC) applications in space systems. The proposed topology is tailored for high-frequency operation, leveraging the superior switching characteristics of GaN devices to achieve improved efficiency. To further minimize conduction losses, synchronous rectification is implemented across the point-of-load (POL) converters associated with each output stage. A comprehensive magnetic design approach is explained to support efficient energy transfer in a compact multi-output configuration. The work includes detailed loss analysis based on real GaN device parameters, offering insights into both switching and conduction losses. Simulation results are used to validate the theoretical analysis, providing steady-state waveforms that demonstrate the functional integrity and high efficiency of the proposed converter. This research supports the viability of GaN-based forward converters as a compelling solution for next-generation space power electronics. Â© 2025 IEEE.
Modified Current Control for Tracking Global Peak Under Fast Changing Partial Shading Conditions
(Institute of Electrical and Electronics Engineers Inc., 2022) P, P.; Vignesh Kumar, V.; Balasubramanian, B.; Ramana, V.
The power - voltage (P-V) characteristics of photovoltaic (PV) systems exhibit multiple power peaks under partially shaded conditions. Several global maximum power point tracking (GMPPT) algorithms in the literature recognize the irradiance change, only after the convergence of operating point to global peak, or use additional hardware to call GMPPT subroutine at definite time intervals to detect any insolation change, and thus track the global peak. However, during fast changing partial shading conditions, these methods are less effective, as they do not detect any irradiance change during the tracking phase of any shading pattern. This paper proposes a novel modified current control approach that uses current as a parameter to detect the insolation change during the tracking phase and track the global peak under fast changing partial shading conditions without any additional hardware. The proposed technique improves the tracking efficiency by as much as 39%, thus proving to be effective under fast-changing partial shading conditions. The superior tracking performance of the proposed algorithm over the existing techniques in terms of its tracking efficiency, dynamic tracking capability, tracking speed, and convergence to the global peak is demonstrated with extensive simulations using MATLAB/Simulink and experimental results. © 1986-2012 IEEE.