Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item Particle Swarm Optimization based Maximum Power Point Tracking Technique for Solar PV System under Partially Shaded conditions(Institute of Electrical and Electronics Engineers Inc., 2021) Naseem, M.; Husain, M.A.; Kumar, J.; Ahmad, M.W.; Minai, A.F.; Khan, A.A.To attain peak power from a PV source, the maximum power point tracking (MPPT) approach is frequently used. The MPP of a photovoltaic (PV) system is not constant since its output characteristics are dependent on numerous parameters. Partial shading causes significant changes in the PV system's attributes, and it often shows several local maxima as well as global maxima. Due to the development of local maxima, traditional MPPT methods fail in partial shade situations. Due to partial shade, solar systems frequently have hot spots, which not only disrupt system yield power but also compromise the system's dependability and safety. Due to the existence of many peaks in the P-V curve under partial shade, the traditional MPPT becomes stuck in local maxima rather than the global peak. As a result, sophisticated MPPT systems are required to accurately track the real peak power despite changing temperature and irradiation circumstances. To accomplish this, this study proposes a tracking scheme based on particle swarm optimization (PSO). The suggested MPPT is simple, versatile, precise, and economical, and it can track global MPP even when partially shaded. The proposed algorithm's performance is examined in MATLAB Simulink to test the effectiveness of the recommended MPPT technique. © 2021 IEEE.Item A Technological Research on Electric Vehicles Charging Approaches and Optimization Methods(Institute of Electrical and Electronics Engineers Inc., 2022) Vani, B.V.; Kishan, D.; Ahmad, M.W.; Hanumanthakari, S.; Reddy, B.N.K.In Present day various countries all throughout the world have taken on Electric Vehicles (EVs) to diminish air pollution and fuel consumption. In coming years, Electric Vehicles are bound to become crucial in the transport field. Subsequently, the charging approaches are in the same line. This paper presents an outline of the current and proposed EV charging approaches and optimization methods. Especially the various EV charging methods like battery exchange, conductive charging and wireless charging are presented. Next, some of the EV charging/discharging optimization methods are examined. On the basis of investigation, a few proposals are put forward for future research. © 2022 IEEE.Item Sliding Mode Observer Based Open-Circuit Fault Detection in the HERIC PV Inverter(Institute of Electrical and Electronics Engineers Inc., 2022) Muhammad Ramees, M.K.P.; Ahmad, M.W.; Brahmendra Yadav Gorla, N.B.Y.Grid connected transformer-less Photovoltaic inverter known as highly efficient and reliable inverter concept (HERIC) is derived from the industrial-standard full-bridge topology with two additional switches on ac side. This paper presents a detection and localization method for open-circuit (OC) failures in the semiconductor switches of HERIC inverter. Fault detection based on sliding mode observer (SMO) is proposed for the ac bypass switches and an average current estimator is used to detect failures in the main switches of full bridge inverter. Two parallel SMOs are developed based on the state space model of the converter under different OC fault conditions in ac bypass leg. Observed grid current and measured grid current are used to obtain the residual which determines the location of OC fault in the inverter. The key advantage of the proposed method is that it does not require additional sensors for fault diagnosis which will improve the system robustness. Efficacy and reliability of the proposed method is validated using simulation studies. © 2022 IEEE.Item Dual Output Symmetrical Voltage Cancellation Controlled Full Bridge Resonant LED Driver(Institute of Electrical and Electronics Engineers Inc., 2023) Ponduru, R.R.; Kishan, D.; Ahmad, M.W.This paper proposes a simultaneous controlled dual output full-bridge converter for LED lighting systems. Two LED lamps are powered using a full-bridge. The devices in full-bridge converter are switched at zero voltage using LC resonant circuit. Therefore, switching transition power losses are minimized which increases the LED driver efficiency. An inductor is connected in series with each LED lamp to reduce ripple current. Thus, the use of electrolytic capacitor can be eliminated. This feature increases lifespan of proposed resonant LED driver. Symmetrical Voltage Cancellation control is designed for both regulation and dimming operation. Numerical simulations are carried out to validate the performance of the proposed LED converter circuit configuration. © 2023 IEEE.Item Open-Circuit Fault Detection and Identification in Neutral Point Clamped Inverter via Sliding Mode Observers(Institute of Electrical and Electronics Engineers Inc., 2023) Muhammad Ramees, M.K.P.; Saywan, Y.A.; Ahmad, M.W.Neutral point clamped (NPC) inverters offer a range of advantages, including reduced switching loss, decreased harmonic distortion in output voltage, minimized emissions impact, and improved efficiency. However, System reliability becomes a significant concern in NPC inverters due to their higher susceptibility to failures due to the increased number of power electronic switches in comparison to conventional two-level inverters. Power electronic switch faults, particularly open circuit faults, can potentially lead to cascaded failures within the system. To address this issue a sliding mode observer-based method is proposed in this paper. The effectiveness of the method is evaluated through detailed simulations using MATLAB/Simulink. The results demonstrate the capability of the sliding mode observer in accurately detecting open switch faults, contributing to enhanced fault diagnosis and improved reliability of NPC inverters. © 2023 IEEE.Item Design of a Multi-Mode DC-DC Converter for High-Power Wireless Charging of Electric Vehicles(Institute of Electrical and Electronics Engineers Inc., 2024) Kishan, D.; Mallikarjuna, B.; Ahmad, M.W.; Chub, A.The design of high-power wireless power transfer (WPT) systems has been the subject of substantial research due to the increasing demand for fast, efficient, and effective battery charging methods for electric vehicle (EV) customers. This paper proposes a DC-DC converter capable of operating in three distinct modes. It incorporates an H6-Bridge inverter, which can be configured as half bridge-half bridge (HB-HB), half bridge-full bridge (HB-FB), and full bridge-full bridge (FB-FB), and is connected through LCC-Series networks to a dedicated H6-Bridge configuration. This innovative design enables efficient charging of EVs with battery voltage classes ranging from 400V to 800V without affecting the current ratings of the converter's components. Furthermore, the paper presents an analysis of an equivalent circuit WPT system for battery packs with output voltages of 400V, 600V, and 800V. To validate its effectiveness, a 7.2 kW power converter with a 600V input and a variable output range from 400V to 800V was simulated, achieving an impressive maximum efficiency of 94.2% across a wide spectrum of output voltages. © 2024 IEEE.