Faculty Publications
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Item Loss Analysis of Conventional and Three Level Boost DC-DC Converters employed for MPPT in PV Systems(Institute of Electrical and Electronics Engineers Inc., 2022) P, P.R.; Vignesh Kumar, V.K.; Balasubramanian, B.Photovoltaic (PV) systems are often exposed to nonuniform insolation due to shading. Under these conditions, there exists multiple peaks in their power-voltage (P-V) characteristics and among which there is one global maximum power point (GMPP). Several GMPP tracking methods employed in the literature have focused mainly on the tracking efficiency. But, the PV system output has to include the DC-DC converter losses also to get the actual estimate of the power extracted. Hence, this paper attempts to analyze the losses incurred in the DCDC converters namely conventional boost converter (CBC) and three-level boost converter (TLBC) connected to a PV array. It is observed that the efficiency of converters depends on the location of GMPP in the (P-V) curve. Further, the impact of switching frequency on the losses of aforementioned two topologies is discussed. A detailed comparison of the loss analysis performed with simulation results obtained from MATLAB/Simulink is provided. © 2022 IEEE.Item A Novel Cubic Boost Converter With Continuous Source Current for PV Applications(Institute of Electrical and Electronics Engineers Inc., 2024) Srinivas, B.; P, P.; Nagendrappa, H.; Balasubramanian, B.A converter with high voltage gain is generally necessary for interfacing the photovoltaic (PV) systems with grid. However, more semiconductor components are needed to obtain a higher voltage gain, which results in increased losses. This brief proposes a novel non-isolated cubic boost (NNICB) DC-DC converter for high-voltage PV applications with a wide voltage gain at a lower duty ratio. Compared to traditional high-gain DC-DC converter, the NNICB converter counters the drawbacks of increased component count and high voltage stress. The NNICB DC-DC converter has a continuous source current for PV applications with low-voltage stress across the diodes and switches. A detailed steady-state analysis of the NNICB topology is carried out for the ideal and non-ideal models, and their corresponding voltage gain equations are computed. Furthermore, the analysis is performed using MATLAB/Simulink and is validated using a 230 W laboratory prototype. The experimental results show that the efficiency of the proposed NNICB topology is 94.42% with a voltage gain of 10.5 at 45% duty ratio. This proves the superior performance of the proposed novel converter in comparison with the existing topologies. © 2004-2012 IEEE.