Browsing by Author "Dastagiri Reddy, B.D."

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A novel AC module with high gain Z-Source converter and pseudo DC-link inverter
(Institute of Electrical and Electronics Engineers Inc., 2020) Damodaran, R.; Dastagiri Reddy, B.D.; Balasubramanian, B.
The effects of partial shading in low power PV systems can be considerably reduced by using a single PV module of appropriate rating. Such a system is termed as the AC module in the literature and consists of a PV module along with the required power electronic circuitry, known as module integrated converter (MIC). The AC module integrated with the grid is required to operate at high efficiency and provide an output voltage of the expected magnitude and frequency. In this paper an efficient MIC with pseudo DC-link (pDC-l) for grid integration of AC module is proposed. The proposed MIC is claimed to be high efficient due to the fundamental frequency operation of the inverter. To obtain a pDC-l of required magnitude from single photovoltaic (PV) module, a high gain Z-source buck-boost converter (ZBBC) is used. It is followed by an unfolding circuit which operates at fundamental frequency to convert the pDC-l to sinusoidal output. The fundamental frequency operation reduces the switching losses without affecting the total harmonic distortion (THD). The operation of the ZBBC, when used to obtain a pDC-l output is analysed and a simple closed loop control is developed. The control ensures a pseudo DC-link voltage at the input of the H-bridge that acts as an unfolding circuit. The control also ensures power balance by controlling the current injected to the grid. Simulations of the proposed AC module with ZBBC cascaded with pDC-l inverter have been carried out using MATLAB/Simulink platform and the results are presented to validate the proposed MIC and its closed loop control. Â© 2020 IEEE.
A Novel Topology and Design Methodology for Improved Power Quality of High-Power Charger
(Institute of Electrical and Electronics Engineers Inc., 2025) Suraj, G.O.; Reddy, M.R.; Dastagiri Reddy, B.D.
This article introduces a novel topology and design methodology of a high-power charger. The proposed topology integrates a modified 12-pulse Diode Bridge Rectifier (12pDBR) with an interleaved boost converter (IBC) to meet the charging requirements and power quality standards. This results in an efficient charger with a reduced number of components and magnetic ratings compared to its counterparts. The mathematical analysis that highlights the significance of triangular shaping of the output currents of a 12pDBR and its impact on the input current harmonics is presented. Furthermore, the role of overlap angle, which is a function of system inductances, in triangular wave shaping is emphasized. A systematic methodology for the coordinated design of 12pDBR and IBC is proposed. To verify the design, MATLAB/Simulink simulations are conducted, followed by experimental validation using a 1 kW prototype. The proposed topology attains a grid current Total Harmonic Distortion (%iTHD) of 4.9%, a power factor (PF) of 0.97 lag, and a charging current ripple of 2.75% at full load condition. © 1982-2012 IEEE.
An FPGA based embedded sytems for online monitoring and power management in a standalone micro-grid
(wiley, 2022) Dastagiri Reddy, B.D.; Venkatraman, K.; Selvan, M.P.; Sridharan, S.
The amalgamation of numerous renewable sources to fulfill the energy demands of the consumers in distant areas with better reliability is a significant challenge because of unpredictable and fluctuating nature of renewable sources. Hence, An effective micro-grid control is required to accomplish the power balance among the load demand and generated power. In this work, A Field Programmable Gate Array (FPGA) based embedded system for online monitoring and power management is proposed for a standalone micro-grid. The developed standalone micro-grid consists of wind energy and solar energy as renewable sources, Diesel generator as a backup supply, And battery bank as storage unit. An algorithm is developed using two Field Programmable Gate Array (FPGA) controllers namely source FPGA controller and load FPGA controller implemented as an embedded system connected through an Ethernet interface with separate source control and load control features. The load FPGA controller provides load management (connecting/ disconnecting non-critical loads) based on the available power and load demand. The source FPGA controller provides source management by controlling the renewable energy sources and dump load. Finally, To monitor the electrical parameters and statuses of various energy sources (wind and solar), Loads (critical and noncritical loads) and storage unit (battery bank) an online monitoring system is developed without the need of a dedicated personal computer. This work has been developed in such a way that it is replicable on the large scale in the field. © 2022 Scrivener Publishing LLC. All rights reserved.
An Optimal Modulation Schemes for a Family of Single-Stage Three Switch Leg Multi-Port Boost DC-AC Converter
(IEEE Computer Society, 2023) Reddy, M.R.N.; Barla, P.C.; Dastagiri Reddy, B.D.; Suraj, G.O.; Prabhakaran, P.; Kishan, D.
This paper presents an optimal modulation schemes for a family of single-stage three switch leg multi-port boost (TSLMPB) DC-AC converters. The proposed multi-port DC-AC converter topologies and associated modulation scheme exchange power between multiple DC and AC ports with high voltage gain. Furthermore, the DC ports functioned with diverse voltage levels, while the AC ports can be operated at varying voltage magnitudes and frequencies. The feasibility of the modulation schemes for the TSLMPB DC-AC converters are evaluated in the MATLAB/ Simulink environment, and the results are presented. To validate the performance and efficiency of the TSLMPB DC-AC converters, a 300 W laboratory prototype was developed, and experimental results are presented and discussed. Â© 2023 IEEE.
Asymmetric clamped mode control for output voltage regulation in wireless battery charging system for EV
(CRC Press, 2023) Kishan, D.; Vinod, M.; Dastagiri Reddy, B.D.; Kannan, R.
Inductive based wireless battery charging (WBC) is gaining popularity in the contemporary electric vehicle industry. As the internal resistance of the battery is continuously changing throughout the charging profile, the charging power needs to be controlled. Phase shift control is mostly used to control the power flow between the transmitter and the receiver of the resonant converter in inductive WBC. During the phase shift control, the semiconductor switches to loose zero voltage switching (ZVS) or zero current switching (ZCS), thereby impacting the efficiency of the resonant converter. To address this, an asymmetrical clamped mode control is proposed for a resonant converter in this chapter. The proposed approach ensures that the power semiconductor switches attain ZVS while meeting the charging power requirements. To validate this, a MATLAB/Simulink model of inductive WBC with the proposed control strategy is developed, and the obtained results are presented. © 2023 selection and editorial matter, Dharavath Kishan, Ramani Kannan, B Dastagiri Reddy and Prajof Prabhakaran; individual chapters, the contributors.
Comparative Analysis of Symmetrical and Asymmetrical Phase Shift Control Strategy for Resonant Wireless Inductive Charging System
(Institute of Electrical and Electronics Engineers Inc., 2021) Vinod, M.; Kishan, D.; Nagendrappa, H.; Dastagiri Reddy, B.D.
This paper describes the operation and performance analysis of series/series resonant wireless inductive charging system with symmetrical phase shift (SPS) and asymmetrical phase shift (APS) control strategies. The H-bridge inverter switches of the resonant wireless inductive charging system (RWICS) are designed to operate with zero voltage switching. The comparison of the SPS, APS switching strategies are discussed in regulation of output voltage for different loading conditions and step change in the reference voltages. It is found that the system efficiency is higher with APS control strategy. Also, the variation in pulse-width angle required for controlling the output voltage is small for various loading conditions in APS compared to the SPS. The MATLAB/Simulink Simulation results confirmed that APS control strategy provides superior performance than SPS control for different loading and different output desired conditions. Â© 2021 IEEE.
Development of Fast Charging Control Algorithm for Electric Vehicles
(Institute of Electrical and Electronics Engineers Inc., 2022) Yadav, A.; Koorata, P.K.; Dastagiri Reddy, B.D.
The rapid market integration of electric vehicles has resulted in an increase in the interest of fast charging technology. One of the major concerns associated with fast charging is safety of the operation. Fast charging involves effective communication between DC charger and battery management system through the charging control algorithm embedded in the vehicle controller unit. The development of such control strategy requires interdisciplinary cooperation between different participants. A lack of system understanding can lead to safety hazards. Here in this paper, we have developed a charging control strategy for CHAdeMO DC charger using model-based development which is a better method than conventional embedded C coding and its working is shown in a starter model of DC charger in STATEFLOW. Â© 2022 IEEE.
Efficient and cost-effective wireless CC/CV charging for electric vehicles: A bipolar duty cycle approach
(Elsevier Ltd, 2024) Vinod, M.; Kishan, D.; Dastagiri Reddy, B.D.; Nagendrappa, N.
Inductive Power Transfer (IPT) has gained significant popularity in recent times, particularly in electric vehicle (EV) battery charging applications. To achieve optimal battery charging, it is imperative to implement both constant current (CC) and constant voltage (CV) modes of operation. Traditionally, CC/CV modes are attained through conventional phase shift techniques, frequency modulation schemes, the use of active converters, and additional compensator circuits and coils. However, these conventional methods not only reduce system efficiency but also escalate overall costs and control complexity on the onboard side. This article proposes a novel bipolar duty cycle control strategy for a series–series resonant IPT system, aiming to achieve CC/CV modes of operation. The proposed control strategy increases the number of switches operated with zero voltage switching, compared to other fixed-frequency phase shift control strategies across a wide load range. Furthermore, the article provides a detailed procedure for implementing the voltage and current compensator. Additionally, it describes the construction of a one-kilowatt laboratory prototype using Sic devices, presenting the obtained results. The peak measured DC–DC efficiency of 93.8 % is achieved at a distance of 150 mm, and the efficiency has also been evaluated under misalignment conditions. © 2024 Elsevier Ltd
IoT Smart Plug based on ESP8266 Wi-Fi Chip
(Institute of Electrical and Electronics Engineers Inc., 2022) Garg, R.; Dastagiri Reddy, B.D.
The 'Internet of Things' or IoT is a term that has been gaining a lot of traction over the last couple of years. It is intricately linked with the ideas of home automation and making devices 'smart' by connecting them to the internet. Smart versions of everyday devices found in homes are now manufactured on large scales, from smart TVs all the way to smart refrigerators. Such devices are fitted with a slew of different sensors along with in built Wi-Fi capabilities. While these devices can be readily purchased, it is not always feasible to replace existing devices with their smart counterparts. Instead, regular non-smart devices can be made smart through external means. This project proposes to build a plug which can fit into the standard single phase 6A wall socket, to which regular devices/ appliances of the appropriate rating can be connected. Doing so will give the connected device smart capabilities, such as being able to control it remotely using a smartphone from anywhere in the world. The proposed 'smart plug' will be based on the ESP8266 Wi-Fi chip, a relay circuit, and an Android application to control it. Â© 2022 IEEE.
Power Electronics for Electric Vehicles and Energy Storage: Emerging Technologies and Developments
(CRC Press, 2023) Kishan, D.; Kannan, R.; Dastagiri Reddy, B.D.; Prabhakaran, P.
This text will help readers to gain knowledge about designing power electronic converters and their control for electric vehicles. It discusses the ways in which power from electric vehicle batteries is transferred to an electric motor, the technology used for charging electric vehicle batteries, and energy storage. The text covers case studies and real-life examples related to electric vehicles. The book â€¢ Discusses the latest advances and developments in the field of electric vehicles â€¢ Examines the challenges associated with the integration of renewable energy sources with electric vehicles â€¢ Highlights basic understanding of the charging infrastructure for electric vehicles â€¢ Covers concepts including the reliability of power converters in electric vehicles, and battery management systems. This book discusses the challenges, emerging technologies, and recent development of power electronics for electric vehicles. It will serve as an ideal reference text for graduate students and academic researchers in the fields of electrical engineering, electronics and communication engineering, environmental engineering, automotive engineering, and computer science. Â© 2023 selection and editorial matter, Dharavath Kishan, Ramani Kannan, B Dastagiri Reddy and Prajof Prabhakaran; individual chapters, the contributors.
Reconfigurable Three-Switch Leg Multi-Port Boost Inverters With Novel Modulation Schemes for Hybrid DC/AC Microgrid Systems
(Institute of Electrical and Electronics Engineers Inc., 2025) Reddy, M.R.N.; Dastagiri Reddy, B.D.; Prabhakaran, P.; Chub, A.; Kouro, S.
This paper proposes reconfigurable single-stage three-switch leg multi-port boost inverters (TSLMPBIs) that feature novel hybrid modulation schemes for hybrid DC/AC microgrid system applications. The TSLMPBI topologies are designed to accommodate various configurations, including two DC ports with two AC ports, three DC ports with one AC port, and three DC ports with two AC ports, tailored for different applications. A hybrid modulation scheme was proposed, dynamically adapted to the configuration of DC and AC ports, facilitating seamless boost and dual inversion operations or combined boost, buck, and inversion functionalities within a single converter. The AC ports operate at various voltages, frequencies, and phases, while the DC ports support multiple voltage levels. The proposed control modulation scheme effectively addresses crossover issues in modulation signals, resulting in enhanced AC voltage gain, improved DC bus utilization, and optimized power transfer among DC and AC ports. Additionally, these topologies reduce active switch count compared to state-of-the-art designs, even with increased ports. To validate the performance of the proposed TSLMPBI and its control modulation scheme, a 500 W laboratory prototype was developed, and experimental results under various operating scenarios were presented and analyzed. © 2013 IEEE.
Single-Phase Single Stage High Gain Six Switch Four-Port Converter
(Institute of Electrical and Electronics Engineers Inc., 2022) Reddy, M.R.; Dastagiri Reddy, B.D.; Prabhakaran, P.; Kishan, D.
This paper proposes a single-phase single-stage high gain six switch four-port (6S4P) converter with a novel modulation scheme. The four ports are 1) a low voltage DC port 2) a high voltage DC port, 3) AC port1 and 4) AC port2. For effective operation of the proposed converter, novel Rectified Inverse Level-shifted Sinusoidal Pulse Width Modulation (RILSPWM) and Phase-shifted Rectified Level-shifted Sinusoidal Pulse Width Modulation (PRLSPWM) schemes are proposed and employed. The proposed converter along with the modulation scheme achieves high voltage gain for both DC and AC ports, and also the ac ports are operated with different magnitudes and frequencies. Thus, improving the power density and reliability of the proposed converter with reduced cost. The performance of the proposed converter is evaluated in the MATLAB/Simulink environment, and the results are presented. Â© 2022 IEEE.
Three-Leg DC-DC Converter for Efficient Inductive Power Transfer of Electric Vehicles for Wide-Range Battery Applications
(Institute of Electrical and Electronics Engineers Inc., 2023) Vinod, M.; Kishan, D.; Dastagiri Reddy, B.D.
The design of an inductive power transfer system for different electric vehicle (EV) models with widely varied battery pack voltages has been a challenging task. The majority of modern EV models are equipped with 400 or 800 V battery packs. To charge both batteries efficiently, an additional dc-dc converter on the receiver side is employed, which reduces the overall system efficiency and also increases the cost. This letter proposes a reduced switch count novel converter to charge distinct EV models without degrading the efficiency of the system. The proposed converter has two operating modes, a voltage doubler mode to charge an 800 V battery and a current doubler mode to charge a 400 V battery at the same power level. MATLAB/Simulink simulations have been carried out to verify the performance of the three-leg converter for both 400 and 800 V batteries at 7.2 kW. Furthermore, a laboratory prototype of the proposed converter for 500 W has been built using the silicon carbide (SiC) devices, and the results obtained are provided. © 1986-2012 IEEE.