Two Output Soft-Switched Full Bridge Based LED Driver with Reduced Voltage Stress
Dr Ramanjaneya Reddy U, Ms Patakamoori Aswini, Aswini Patakamoori, Ramanjaneya Reddy Udumula, Tousif Khan N and Kasi Ramakrishna Reddy Ch
Source Title: IEEE Transactions on Consumer Electronics, Quartile: Q1
A Novel PWM Inverter Powered by Single DC Source for a Multiple Pole Pair Induction Motor
Dr Ramanjaneya Reddy U, Kiran Kumar Nallamekala, Ramanjaneya Reddy Udumula, Pratikanta Mishra, Naresh Kumar Vemula, A Rama Krishna
Source Title: Recent Advances in Power Electronics and Drives, Quartile: -
Zero voltage switching with reduced current stress for LED lighting applications
Source Title: IET Power Electron, Quartile: Q2
Development of bi-directional switched-capacitor DC-DC converter for EV powertrain application
Dr Ramanjaneya Reddy U, K. Mounika Nagabushanam, Tarkeshwar Mahto, Somesh Vinayak Tewari, Ramanjaneya Reddy Udumula, Majed A. Alotaibi, Hasmat Malik, Taha Selim Ustun
Source Title: Engineering Science and Technology, an International Journal, Quartile: Q1
Non-isolated High-Gain DC-DC Converter with Moderate Gain for Hybrid Energy System Applications on DC Microgrids
Dr Ramanjaneya Reddy U, Ms Maya Vijayan, M. Vijayan, U. Ramanjaneya Reddy and T. Mahto
Source Title: 2025 Fourth International Conference on Power, Control and Computing Technologies (ICPC2T), Quartile: -
View abstract ⏷
A novel non-isolated High-Gain DC-DC Converter with Moderate Gain for Hybrid Energy System applications on DC Microgrids. The paper proposes a novel high-gain DC-DC converter for Hybrid energy systems such as Solar Photovoltaic (PV) systems, Fuel cells (FC), etc. The converter can replace the necessity of multiple converters for multiple sources. The major contributions are the lower switch voltage stress, High boost gain, multiple input capability, and lower component count as a dual source capability. The design and analysis of ideal and non-ideal conditions of the components are discussed and the individual effects of each component are analyzed. Further, the non-ideal gain and non-ideal efficiency are derived and presented. Also, Simulation results with a rated power of 100 W are presented.
Bidirectional AC-DC Converter System for Grid-to-Vehicle and Vehicle-to-Grid Applications
Dr Ramanjaneya Reddy U, R Revanth Sai, M Hemanth Kumar, Mayen Akoy Dual, Shubh Lakshmi, Somesh Vinayak Tewari, Ramanjaneya Reddy Udumula
Source Title: Recent Advances in Power Electronics and Drives, Quartile: -
Power Factor Correction Buck-Boost Converter for On-Board EV Charging Application
Dr Ramanjaneya Reddy U, Ramanjaneya Reddy Udumula, Surjeet Patnaik, Sharan Kumar Nandigama, Uday Sankar Dega, Bhamidi Lokeshgupta, Naresh Kumar Vemula, N Kirankumar
Source Title: Recent Advances in Power Electronics and Drives, Quartile: -
View abstract ⏷
This work presents the power factor correction (PFC) buck-boost converter for on-board electric vehicle (EV) charging applications. The PFC buck-boost converter is designed to operate in discontinuous current conduction mode (DCCM), thus achieving natural PFC for the universal input voltage range. In addition, DCCM operation does not require input voltage or current sensors; as a result, the control is more reliable and economical than continuous current conduction mode (CCCM). Furthermore, the buck-boost converter switch operates in zero current switching (ZCS) which results in reduced switching losses and improves the efficiency. The detailed steady-state analysis, operating modes, and design analysis for DCCM operation are presented. To validate the theoretical studies, a closed-loop voltage mode control of the PFC buck-boost converter is developed and tested in a PSIM software environment. The simulation results uphold the converter analysis and achieve a high power factor and low total harmonic distortion (THD) for the universal input range.
A Novel Multi-Port High-Gain Bidirectional DC-DC Converter for Hybrid Energy Storage Applications
Dr Ramanjaneya Reddy U, Ms Maya Vijayan, M. Vijayan, Ramanjaneya Reddy Udumula, T. Mahto and R. E. K. M
Source Title: IEEE Transactions on Consumer Electronics, Quartile: Q1
View abstract ⏷
This work presents a novel multi-port high-gain bidirectional DC-DC converter (MPHG-BDC) designed for energy storage systems with consumer benefits. The proposed MPHG-BDC enables the integration of multiple low voltage sources, utilizing modular converters to achieve high step-up gain in boost mode and high step-down gain in buck mode through the voltage multiplier. Thus, facilitating the grid to vehicle (G2V) and vehicle to grid (V2G) power flow, which the consumers can utilize the electric vehicular batteries as a backup power supply. Thus, facilitates power availability even in remote areas for household electrification. The highlights include reduced averaged normalized switch voltage stress, continuous LV currents, multiple low-voltage source integration, and ease of control. The proposed MPHG-BDC is thoroughly analyzed under steady-state conditions, with and without accounting for the non-idealities. A detailed examination of the boost and the buck modes, loss analysis, and comparison with existing bidirectional converter topologies are provided to showcase the performance of the proposed converter. The overall efficiency of converter is analyzed and discussed. At rated conditions, the efficiency in the boost mode is 93.2% and in buck mode is 92.7%. The operation with independent source operation (failure mode case) is verified and results are presented. The theoretical aspects are validated using a 100W laboratory module.
Power Factor Correction(PFC) for EV Charger Using PI Controller in G2V Application
Dr Ramanjaneya Reddy U, J V Adari, S V Tewari, A Chakravarty, Ramanjaneya Reddy Udumula, G J Sagar and T Mahto
Source Title: 2025 International Conference on Sustainable Energy Technologies and Computational Intelligence (SETCOM), Quartile: -
Random Forest based Machine Learning Algorithm for Estimating State of Charge in Lithium-ion Batteries
Dr Ramanjaneya Reddy U, Ms Dasari Sai Ram Surya Lakshmi Avanthika, D S R S L Avanthika, B Lokeshgupta and Ramanjaneya Reddy Udumula
Source Title: 2025 Fourth International Conference on Power, Control and Computing Technologies (ICPC2T), Quartile: -
Adaptive neural network models for state of charge estimation under dynamic battery conditions
Dr Ramanjaneya Reddy U, Ms Dasari Sai Ram Surya Lakshmi Avanthika, D. S. R. S. L. Avanthika, B. Lokeshgupta and Ramanjaneya Reddy Udumula
Source Title: Journal of Energy Storage, Quartile: Q1
View abstract ⏷
Battery-powered electric vehicles (EVs) are gaining more popularity nowadays due to increasing concerns about global warming and the depletion of fossil fuels. The performance of EV battery is affected by various weather conditions. So, the continuous monitoring of battery states is necessary to ensure the reliable operations and safety of the battery. The battery management system (BMS) plays a crucial role in monitoring and executing optimal battery operations. For the monitoring of battery operations, the estimation of key parameter i.e., state of charge (SoC) information is very much needed. This paper proposes an adaptive convolutional neural network (CNN) prediction model to estimate the battery SoC levels for different operating conditions. The proposed CNN model is structured with five layers including input, hidden, and output layers by considering the system complexity and performance time. The proposed SoC prediction model has been tested in different scenarios such as estimation at various ambient temperatures, charging and discharging phases of battery, chemical compositions, and different C-rate values to show its performance efficiency and robustness. Furthermore, the simulation results of the proposed SoC estimation model have also been compared with the other deep learning models such as feed-forward neural network (FNN) and recurrent neural network (RNN) by using different performance metrics to show its superior prediction accuracy levels. Finally, it is clearly evident that the proposed adaptive CNN model accurately estimates the battery SoC values under different operating conditions.
Dual Estimation of State of Charge and State of Health of a Battery: Leveraging Machine Learning and Deep Neural Networks
Dr Ramanjaneya Reddy U, Ms Dasari Sai Ram Surya Lakshmi Avanthika, D S R S L Avanthika, Ramanjaneya Reddy Udumula, B Lokeshgupta and M K Morampudi
Source Title: 2025 Fourth International Conference on Power, Control and Computing Technologies (ICPC2T), Quartile: -
Nonlinear Adaptive Neural Control of Power Converter-Driven DC Motor System: Design and Experimental Validation
Source Title: Engineering Reports, Quartile: Q2
A comparative analysis of non-isolated Bi-directional converters for energy storage applications
Dr Ramanjaneya Reddy U, K Mounika Nagabushanam, Somesh Vinayak Tewari, Ramanjaneya Reddy Udumula and Tarkeshwar Mahto
Source Title: Engineering Research Express, Quartile: Q2
View abstract ⏷
Bi-directional DC-DC converters (BDC) are required for power flow regulation between storage devices and DC buses in renewable energy based distributed generation systems. The fundamental requirements of the BDC are simple structure, reduced switching components, a wide range of voltage gain, low voltage stress, high efficiency, and reduced size. There are different BDC topologies for various applications based on their requirements in the literature. Various BDC are categorized according to their impedance networks. Isolated BDC converters are large due to high-frequency transformers and hence used for static energy storage applications whereas non-isolated BDC is lightweight and suitable for dynamic applications like electric vehicles. This paper reviews types of non-isolated BDC topologies. The performance of five non-isolated BDC converters under steady state condition is evaluated by using theoretical analysis. On this basis, suitability of BDC for different applications is discussed. Further advantages and limitations of converters are discussed by using comparative analysis. The optimization of BDC for distributed generation systems from the perspectives of wide voltage gain, low electromagnetic interference, low cost with higher efficiency is identified. Theoretical analysis of the converters is validated by simulating 200W converters in MATLAB Simulink.
Development of High-Gain Switched-Capacitor based Bi-directional Converter for Electric Vehicle Applications
Source Title: Journal of Energy Storage, Quartile: Q1
A Novel Zero Voltage Switching Full Bridge Converter for Multiple Load Battery Fed LED Driver Applications
Dr Ramanjaneya Reddy U, Ms Patakamoori Aswini, A Patakamoori, Ramanjaneya Reddy Udumula, T K Nizami and K R Reddy Ch,
Source Title: IEEE 4th International Conference on Sustainable Energy and Future Electric Transportation (SEFET), Quartile: -
View abstract ⏷
A novel zero-voltage switching full-bridge (NZVSFB) converter designed for multiple load LED driver applications is introduced in this paper. Four LED lamps are involved in this configuration, with Lamp-2, Lamp-3, and Lamp-4 being powered by a full bridge converter, and Lamp-l being directly connected in series with the battery source. The efficiency of the system is increased since the power provided to lamp-l comes directly from a battery source, eliminating the need for any power processing stage. The major claims of the proposed NZVSFB converter are low component count/lamp, enhanced efficiency, zero voltage switching (ZVS) of all the switching devices, ripple free current and equal current sharing. The interleaved technique utilized in inductor design aims to mitigate the adverse effects of ripple currents on LED performance and circuit reliability by reducing their magnitude and ensuring more stable operation. The steady state operation of the proposed NZVSFB converter is discussed in detail and the effectiveness of the circuit is verified in MATLAB Simulink environment.
Dynamic Operation of Islanded DC microgrid with Fuel Cell using Hybrid Energy Storage Systems
Dr Ramanjaneya Reddy U, Ms Maya Vijayan, Maya Vijayan, Ramanjaneya Reddy Udumula, Tarkeshwar Mahto and Lokeshgupta Bhamidi
Source Title: Emerging Technologies in Electrical Engineering for Reliable Green Intelligence, Quartile: -
View abstract ⏷
Effective utilization of renewable energy sources (RES) is with the better management of their fluctuation nature. Employing hybrid energy storage systems (HESS) in line with the RES will improve the power flow equilibrium in the DC microgrids (DC-MG). In this paper, a PI control-based hybrid energy storage system with a Proton exchange membrane (PEM) fuel cell (FC), battery, and a supercapacitor (SC) for increasing the effectiveness of renewable power in the DC-MG is presented. A validation test is conducted for a 100 W DC microgrid system to verify the effectiveness of the proposed model. The MATLAB/SIMULINK software is used to implement the proposed system.
A Three Leg Asymmetrical Voltage Resonant Converter With Independent Dimming Control for Multiple Load LED Lighting Applications
Dr Ramanjaneya Reddy U, Ms Maya Vijayan, Ramanjaneya Reddy Udumula, Maya Vijayan, Ch Kasi Ramakrishna Reddy, Mehataj Syed, Aswini Patakamoori and Busam Gopichand
Source Title: IEEE Transactions on Industry Applications, Quartile: Q1
View abstract ⏷
LED lighting has emerged as a global solution for sustainable industrial lighting. The three-leg asymmetrical voltage resonant converter has been designed for optimal performance in dimmable Light-emitting diode (LED) lighting applications. Its distinctive features, including enhanced efficiency, asymmetrical voltage regulation, Zero Voltage Switching (ZVS) of all power switches, and an independent dimming control strategy, make it well-suited for high-power LED lighting applications. The converter under consideration incorporates a common leg-1 to drive load-1 and load-2. So that, the load-1 and load-2 are powered by the asymmetrical voltage between leg-1 and leg-2, and leg-1 and leg-3 respectively. To enable independent dimming control, the voltages between legs are nullified by individual dimming levels. The proposed circuit incorporates two resonant circuits. This configuration ensures that all power switches operate with ZVS, effectively minimizing switching losses. Further, the threshold voltage of each LED load is supplied by the battery in turn resulting in a lower power processing of the converter. The detailed operational principle and design considerations are discussed. Moreover, the loss analysis, detailed comparison with similar works, and the efficiency analysis at different dimming conditions are presented. Finally, the effectiveness of the converter is verified in a MATLAB Simulink environment and an 80W laboratory prototype.
Real Time Implementation of Buck Converter Using Optimized Type Compensators
Dr Ramanjaneya Reddy U, Mr Sasank Das Gangula, S Das Gangula, A Mukhtar, T Khan Nizami, A Chakravarty, and Ramanjaneya Reddy Udumula
Source Title: IEEE 4th International Conference on Sustainable Energy and Future Electric Transportation (SEFET), Quartile: -
View abstract ⏷
This work investigates the application of Artificial Bee Colony (ABC) optimization for the design of Type compensators utilizing the dual-loop control scheme. The proposed Type compensators integrate the ABC optimization for regulating the closed-loop operation of a DC-DC buck converter. Such an integration of ABC optimization, aids in effectively regulating the output voltage and inductor current, besides ensuring enhanced time domain criteria. The proposed dual-loop control scheme consists of a current loop and a voltage loop. The current loop regulates the inductor current and the voltage loop regulates the output voltage. The efficacy of the proposed method is revealed through extensive simulation and experimental investigation under start-up response, step perturbations in external load. The experimentation is conducted on a laboratory prototype using dspace DS1104 control board.
Non-Isolated Bi-directional DC-DC Converter based on Modified Switched Capacitor for obtaining high Voltage Transfer Ratio
Dr Ramanjaneya Reddy U, K Mounika Nagabushanam, Somesh Vinayak Tewari, Ramanjaneya Reddy Udumula and Tarkeshwar Mahto
Source Title: Emerging Technologies in Electrical Engineering for Reliable Green Intelligence, Quartile: -
Smart Home Energy Management with a Coordinated Neighbourhood Energy Sharing
Dr Ramanjaneya Reddy U, Ravi varma K, Lokeshgupta B and Ramanjaneya Reddy Udumula
Source Title: Emerging Technologies in Electrical Engineering for Reliable Green Intelligence, Quartile: -
View abstract ⏷
The rapid increase in demand for electricity and the emergence of the smart grid have dealt with optimistic opportunities for home energy management systems. The smart home with the integration of renewable energy sources such as photovoltaic systems, micro-wind turbines, and battery storage can provide in-house power generation and also give the option of exporting power to the grid. This paper mainly proposes a centralized coordinated neighborhood power-sharing with incentive-based energy management for multiple smart home consumers. The incentive method and various pricing schemes like time of use and feed-in tariff are considered in this paper to determine the electricity billing of all smart home consumers. Due to these incentives and pricing schemes in this model, all smart home consumers are encouraged to be involved in neighborhood energy sharing. A group of ten smart homes with various load profiles and RER energy integration is considered as a test system to determine the performance of the proposed neighborhood smart home energy management model. The simulation results show that the centralized neighborhood-coordinated smart home energy management model can provide significant economic benefits to all smart home consumers when compared to the without neighborhood power-sharing case.
Experimental Investigation on Backstepping Control of DC-DC Buck Converter Fed Constant Power Load
Dr Ramanjaneya Reddy U, Mr Sasank Das Gangula, Sasank Das Gangula, Tousif Khan Nizami and Ramanjaneya Reddy Udumula
Source Title: IFAC-PapersOnLine, Quartile: Q3
View abstract ⏷
In contemporary energy production, there's been a significant transition from coal-centric methods to renewable energy sources (RES) that emit zero pollutants. As RES becomes more integral to expansive power systems, there's a growing need for regulated power electronic systems. When integrated with microgrids, RES often face stability challenges, being represented in DC microgrids as a constant power load (CPL). The DC-DC converters designed to operate these CPL loads are affected by switching irregularities and the destabilizing effects of CPL, leading to broader power system instability. This study introduces a backstepping control (BSC) approach for a DC-DC buck converter operating with CPL. Through extensive experimental investigations, the effectiveness of the proposed controller under various test conditions, contrasting its results with the cascade PI controller have been evaluated. The outcomes reveal that the proposed backstepping control technique enhances both the dynamic and steady-state performance of the DC-DC buck converter-CPL system, especially during extensive fluctuations in the load power.
Enhanced Predictive Torque Control of Open Winding Permanent Magnet Synchronous Motor Drive with Common Mode Voltage Elimination
Dr Ramanjaneya Reddy U, Ravi Eswar K.M, Sivaprasad Athikkal, Ramanjaneya Reddy Udumula, Narender Reddy Kedika,
Source Title: Recent advances in Power Systems, Quartile: -
Three-Leg Asymmetrical Voltage Resonant Converter for Multiple LED Load Applications with Independent Dimming Control
Dr Ramanjaneya Reddy U, Mehtaj, Busam Gopichand and Ramanjaneya Reddy Udumula and Ch Kasi Ramakrishna Reddy
Source Title: 2023 IEEE IAS Global Conference on Emerging Technologies, Loughborough University, London UK, Quartile: -
View abstract ⏷
In this paper a new three-leg asymmetrical voltage resonant converter is proposed for multiple LED load applications. The converter is developed with leg-1 has common for both LED loads. The main contributions of the proposed work are: (1) Independent dimming control of LED loads, (2) Zero Voltage Switching (ZVS) of all the power switches, (3) High efficiency and (4) Regulation with asymmetrical voltage control. To achieve independent dimming control, the PWM dimming is employed with leg-2 and leg-3. Two resonant circuits are connected in the proposed circuit. Owing to this all the power switches operate with zero voltage switching which reduces the switching losses, resulting in higher converter efficiency. The loads can be regulated using asymmetrical voltage control. The threshold voltage for the LED loads is supplied with battery source, therefore power processing of converter is reduced. The operating modes and steady-state analysis of the proposed converter are presented in detail and verified by using the MATLAB Simulink environment.
An Efficient Soft-Switched LED Driver for Street Lighting Applications with Input Regulation
Dr Ramanjaneya Reddy U, Ms Patakamoori Aswini, Aswini Patakamoori, Ramanjaneya Reddy Udumula, Tousif Khan Nizami and Kasi Ramakrishna Reddy Ch
Source Title: IEEE Journal of Emerging and Selected Topics in Power Electronics, Quartile: Q1
View abstract ⏷
In this article, an efficient soft-switched light emitting diode (LED) driver with input regulation is proposed. The converter drives multiple lamps, and it is divided into two sections. Lamp-2 and lamp-3 are driven by a full bridge converter (FBC), while lamp-1 is placed in series with the input dc voltage source. Power is delivered to lamp-1 without passing through the FBC, which results in improved efficiency. The main benefits of the presented LED driver are: 1) lower current ratings of the FBC switches; 2) ripple-free lamp currents; 3) zero voltage switching (ZVS); 4) high power efficiency; 5) drives multiple lamps; 6) input regulation for source variation; and 7) lower components per lamp. To reduce the current rating of FBC switches, two identical lamps are powered using interleaved inductors. Owing to this, the lamps experience ripple-free currents. Further, due to this, the ZVS is achieved which results in high efficiency. A closed-loop buck-boost converter will compensate for the variations in input by adjusting the duty cycle. The converter operating modes, steady state, and efficiency analysis are discussed in detail. Moreover, to indicate the performance of the converter, a 130 W prototype is built, and experimental results are presented.
Soft-Switched Full-Bridge Converter for LED Lighting Applications with Reduced Switch Current
Dr Ramanjaneya Reddy U, Ms Patakamoori Aswini, Aswini Patakamoori, Ramanjaneya Reddy Udumula, Tousif Khan Nizami and and Kasi Ramakrishna Reddy Ch
Source Title: International Journal of Circuit Theory and Applications, Quartile: Q2
Comparative Analysis of Resonant Converter Topologies for Multiple Load Light Emitting Diode Applications
Dr Ramanjaneya Reddy U, Ms Patakamoori Aswini, Aswini Patakamoori, Ramanjaneya Reddy Udumula, Tousif Khan Nizami, Ravi Eswar Kodumur Meesala,
Source Title: Recent Advances in Power Electronics and Drives, Quartile: -
View abstract ⏷
The Light Emitting Diodes (LEDs) are gaining more importance in several lighting applications due to their advantages, such as high efficiency, long life, and environment friendliness, over conventional lighting sources. The driver circuit is a significant component in an LED lighting system to provide regulated power to the lamp. Numerous, DC-DC converter topologies have been proposed for LED lighting applications. Under which low- and medium-power lighting applications such as domestic lighting, traffic lighting, and decorative lighting, non-isolated driver circuits are more beneficial. However, in high-power applications such as street lighting and industrial lighting, isolated and soft switching converters are mostly used as LED driver circuits. Due to high-power capability, reduced switching losses, less component count, high frequency of operation, and high efficiency, soft switching converters are drawing more attention in high-power applications. This paper presents a comparative analysis of resonant LED driver topologies proposed for multiple load lighting applications. Simulations of a few full bridge LED driver topologies have been carried out using MATLAB/Simulink environment. Various performance parameters are evaluated, and finally, conclusions are drawn.
Adaptive Neural Network Control of DC-DC Power Converter
Source Title: Expert Systems With Applications, Quartile: Q1
Real Time Implementation of Laguerre Neural Network based Adaptive Control of DC-DC converter
Dr Ramanjaneya Reddy U, Mr Sasank Das Gangula, S. D. Gangula, T. K. Nizami and Ramanjaneya Reddy Udumula
Source Title: Soft Computing: Theories and Applications,, Quartile: -
View abstract ⏷
Applications of power electronic converters have increased invariably in fields of engineering such as robotics, e-mobility and smart grids. DC-DC converters are employed as a switching devices to obtain a required amount of DC voltage in various industrial applications. Under the class of non-isolated DC-DC power converters, the buck converters are of specific interest, as they provide lower DC output voltage than the source DC voltage. In order to obtain a faithful output voltage tracking despite disturbances affecting the system, the converter is connected in the closed feedback loop. In this respect, this paper presents the design, development and experimental findings of Laguerre neural network driven adaptive control of DC-DC buck power converter. The stability of the proposed controller is established through Lyapunov stability criterion. Further, the results are compared with adaptive backstepping control method, by subjecting the converter to start-up test, step changes in the load resistance, input voltage and reference voltage tests. Thereafter, the performance is evaluated on DSP-based dSPACE 1104 processor in the laboratory. Finally, the results are compared in terms of settling time of output voltage state. The results indicate an enhanced dynamic performance of both output voltage and inductor current with the action of proposed controller, thus making it suitable for fast practical applications.
Development of Enhanced Direct Torque Control for Permanent Magnet Synchronous Motor Drive Operation in Electric Vehicle Application
Dr Ramanjaneya Reddy U, Ravi Eswar Kodumur Meesala, Ramanjaneya Reddy Udumula, Tousif Khan Nizami, Alireza Hosseinpour
Source Title: IET Power Electronics, Quartile: Q2
View abstract ⏷
Direct torque control (DTC) is one of the most prominent control techniques used by permanent magnet synchronous motor (PMSM) drives in industry applications. Nevertheless, the presence of hysteresis controllers and inaccurate voltage switching table in traditional DTC results in higher torque and flux ripple. This study proposes an enhanced DTC functioned Surface-mounted PMSM (S-PMSM) drive with mitigation of torque and flux ripple. The operation relies on generating the reference voltage vector (VV) in a stationary reference frame, which supports control of torque and flux without hysteresis controllers. The reference VV generation is simple and does not affect control robustness. The position of reference VV in a sector is used to build the voltage vector (VV) switching table. As a result, the application of nearest discrete VV to reference VV produces optimal torque and flux control. Moreover, redundant switching combinations of null VV are effectively used for possible minimization of switching frequency of two-level voltage source inverter (VSI) supplied S-PMSM drive. Therefore, proposed DTC gains improved S-PMSM drive response along with switching frequency reduction. In dSPACE-RTI 1104 platform, experimental response of S-PMSM drive under various operating conditions have been depicted to highlight the proficiency of proposed DTC in comparison with existing DTC.
Seagull Optimization Algorithm Based Fractional Order Fuzzy Controller for LFC of Multi Area Diverse Source System With Realistic Constraints
Dr Ramanjaneya Reddy U, Naga Sai Kalyan, Srikanth Goud, Rami Reddy, Ramanjaneya Reddy Udumula et.al,
Source Title: Frontiers in Energy Research (Smart Grids), Quartile: Q2
View abstract ⏷
This study initiates the implementation of fractional-order (FO) fuzzy (F) PID (FOFPID) controller fine-tuned using a seagull optimization algorithm (SOA) for the study of load frequency control (LFC). Initially, the SOA-tuned FOFPID regulator is implemented on the widely utilized model of dual-area reheat-thermal system (DARTS), named test system-1 in this work for a perturbation of 10% step load (10% SLP) on area-1. Dynamical analysis of the DARTS system reveals the viability of the SOA-tuned FOFPID control scheme in regulating frequency deviations effectively compared to other control schemes covered in the literature. Later, the presented regulator is implemented on the multi-area diverse sources (MADS) system possessing realistic constraints in this study, termed test system-2. The sovereignty of the presented FOFPID controller is once again evidenced with controllers of PID/FOPID/FPID fine-tuned with the SOA approach. Moreover, the effect of considering practical realistic nonlinearity constraints such as communication time delays (CTDs) on MADS system performance is visualized and the necessity of its consideration is demonstrated. Furthermore, AC-DC lines are incorporated with the MADS system to enhance the performance under heavy-load disturbances and the robustness of the proposed regulatory mechanism is deliberated.
Uninterrupted Multi-output DC-AC Power Supply with Independent Output Voltage Regulation
Dr Ramanjaneya Reddy U, Rahul Kotana, Sundeep Kumar Parisa, Mounika Nagabushanam, Tarkeshwar Mahto and Ramanjaneya Reddy Udumula
Source Title: 3rd International Conference for Emerging Technology, Belgaum, India, Quartile: -
Legendre Neural Network based Intelligent Control of DC-DC Step Down Converter-PMDC Motor Combination
Dr Ramanjaneya Reddy U, Mr Sasank Das Gangula, Tousif Khan Nizami, Sasank Das Gangula, Ramanjaneya Reddy Udumula, Harsh S. Dhiman
Source Title: IFAC-Papers Online, Quartile: Q3
View abstract ⏷
Angular velocity control in DC-DC converter-driven direct current (DC) motors exhibit several challenges in numerous applications. This article proposes a novel single functional layer Legendre neural network integrated adaptive backstepping control technique for the DC-DC step down converter-permanent magnet DC (PMDC) motor system. The proposed controller first aims to estimate the uncertainties in an online mode and then compensate the same efficiently during the robust control action. The closed loop feedback stability of the entire system under the action of proposed controller and the online adaptive learning laws are proved using Lyapunov stability criterion. Further, the proposed controller is numerically simulated for various test conditions including; (a) startup response, (b) a step change in the load torque and (c) reference angular velocity tracking. The transient performance measures of angular velocity such as peak overshoot, peak undershoot and settling time have been observed under the proposed control design and compared with the response obtained from proportional-integral-derivative (PID) controller. Finally, the results presented demonstrate the efficacy of the proposed controller in yielding an enhanced performance under both nominal and perturbed test conditions over a wide operating range.
Optimal PI-Controller-Based Hybrid Energy Storage System in DC Microgrid
Dr Ramanjaneya Reddy U, Ms Maya Vijayan, Maya Vijayan, Ramanjaneya Reddy Udumula, Tarkeshwar Mahto, Bhamidi Lokeshgupta, B Srikanth Goud, Ch Naga Sai Kalyan, Praveen Kumar Balachandran, Dhanamjayulu C, Sanjeevikumar Padmanaban, and Bhekisipho Twala
Source Title: Sustainability, Quartile: Q1
View abstract ⏷
Power availability from renewable energy sources (RES) is unpredictable, and must be managed effectively for better utilization. The role that a hybrid energy storage system (HESS) plays is vital in this context. Renewable energy sources along with hybrid energy storage systems can provide better power management in a DC microgrid environment. In this paper, the optimal PI-controller-based hybrid energy storage system for a DC microgrid is proposed for the effective utilization of renewable power. In this model, the proposed optimal PI controller is developed using the particle swarm optimization (PSO) approach. A 72 W DC microgrid system is considered in order to validate the effectiveness of the proposed optimal PI controller. The proposed model is implemented using the MATLAB/SIMULINK platform. To show the effectiveness of the proposed model, the results are validated with a conventional PI-controller-based hybrid energy storage system.
Comparative Study of Various DC-DC Converter Topologies for PV Powered EV Charging Stations
Dr Ramanjaneya Reddy U, Ms Maya Vijayan, Maya Vijayan, Ramanjaneya Reddy Udumula and Tarkeshwar Mahto
Source Title: ECS Transactions, Quartile: Q2
View abstract ⏷
There is a drift in automotive industry from conventional internal combustion engines (ICE) to Electric Vehicles (EVs). This drift from ICE to EVs counts to the reduced carbon emission and thus reducing environmental pollution. EVs also find a solution for increasing fossil fuel costs. When it comes to renewable energy sources, typically to solar energy, it is affluent and reliable. The usefulness of solar energy is maximized by the incorporation of advanced power converter topologies along with their advanced controls. This paper aims to compare some of the boost converter topologies that are used in EV applications with solar photovoltaic powered charging stations. The comparative study is conducted on various parameters, such as DC voltage gain, duty-cycle, efficiency, voltage stress, merits, and demerits. Simulation results are analyzed and compared using MATLAB/Simulink platform.
High Gain Boost Converter Fed Single-Phase Sine Pulse Width Modulated Inverter
Dr Ramanjaneya Reddy U, Phani Sri Rahul Kotana, Hima Bindu SK, Ramanjaneya Reddy Udumula and Srikanth Goud
Source Title: IJRER, Quartile: Q3
PV/WT integrated system using the Gray Wolf Optimization Technique for power quality improvement
Dr Ramanjaneya Reddy U, Srikanth Goud B, Rami Reddy, Naga Sai kalyan Ch, Ramanjaneya Reddy Udumula, et.al.
Source Title: Frontiers in Energy Research (Process and Energy Systems), Quartile: Q2
View abstract ⏷
This paper presents the integration of renewable energy sources such as photovoltaics, wind, and batteries to the grid. The hybrid shunt active power filter (HSHAPF) is optimized with the Gray wolf optimization (GWO) and fractional order proportional integral controller (FOPI) for harmonic reduction under nonlinear and unbalanced load conditions. With the use of GWO, the parameters of FOPI are tuned, which effectively minimizes the harmonics. The proposed model has effectively compensated the total harmonic distortions when compared with without the filter and with the passive filter, the active power filter with a PI controller, and the GWO-FOPI-based controller. The performance of the proposed controller is tested under nonlinear and unbalanced conditions. The parameters of the FOPI controller are better tuned with the GWO technique. The comparative results reflect the best results of GWO-FOPI-based HSHAPF. The suggested controller is built in the MATLAB/Simulink Platform.
Single Input LC Series Resonant Converter Based High Brightness Light Emitting Diode Driver with ZVS
Source Title: Journal of Power Technologies, Quartile: -
View abstract ⏷
This work proposes a high brightness light emitting diode (HB-LED) driver circuit based on a full-bridge LC series resonant converter with series DC bus for low power applications with a dimming feature. The proposed configuration consists of full-bridge LC series resonant converter with a series DC bus. The idea behind the concept is to supply the light emitting diode (LED) threshold voltage directly from the constant DC bus - and the control voltage, which is used for current regulation, is supplied through a full-bridge LC resonant converter. Since the control voltage responsible for current regulation is only processed by the full-bridge series resonant converter, the conduction loss is less even if several LED strings are connected to the same converter. The proposed HB-LED driver is characterized by low switching loss, reduced component count, high efficiency, and reduction of output electrolytic capacitor. Further, double pulse width modulation (DPWM) dimming control is designed and used to control the average output currents. The proposed high brightness light emitting diode (HB-LED) driver circuit based on a full-bridge LC series resonant converter is simulated using Orcad/PSpice software. The theoretical analysis and predictions of the proposed full-bridge series resonant converter-based HB-LED driver is in close agreement with the results obtained.
Design of Dimmable Light Emitting Diode Driver for Low Power Applications
Dr Ramanjaneya Reddy U, Ramanjaneya Reddy Udumula, Kalyan Kumar Koppolu,
Source Title: Journal of Power Technologies, Quartile: -
View abstract ⏷
High-brightness light emitting diodes (HB-LED) are used in various applications in preference to conventional light bulbs due to following merits: eco-friendly nature, high luminous efficacy, prolonged life, compactness and low heat dissipation. This work presents the boost converter fed dimmable light emitting diode where illumination control is required. The proposed work uses pulse width modulated (PWM) controlled switch in series with LED load to control the illumination level by adjusting the pulse width. The closed loop control is designed in Matlab/Simulink to regulate the load voltage. This paper first illustrates in detail the basic operation of the converter and dimming control and then provides the simulation results with different illumination levels to demonstrate the effectiveness of converter and controller
Voltage Mode Control DCM HSD-CIB PFC Converter for HB-LED Lighting Applications
Source Title: Journal of Power Technologies, Quartile: -
View abstract ⏷
High-brightness light emitting diodes (HB-LEDs) are gaining immense attention from the angle of both residential and industrialapplications, owing to their advanced futures of longevity, compact size, high efficacy and eco-friendly nature. To meetadvanced future requirements, the LED driver should be robust and efficient. In addition, for HB-LED lighting applications, anac-dc LED driver demands high-step-down conversion ratio, less source current harmonics, high power factor (PF) and to becost effective. This work proposes a high-step-down coupled inductor-buck (HSD-CIB) based power factor correction (PFC)converter operating in discontinuous current mode (DCM) to attain high PF with low source current harmonics. Moreover,the proposed HSD-CIB can overcome the demerit of the existing single-stage ac-dc buck PFC converter in terms of highvoltage/current switching stress, gate-driver complexity, low conversion gain and low efficiency. This paper presents thedetailed design and analysis of the proposed HSD-CIB PFC converter for an LED lighting system. A closed loop voltagemode control (VMC) is designed and implemented to study the line regulations of HSD-CIB converter at various loadingconditions. The analysis of the proposed HSD-CIB topology is carried out using Matlab/Simulink simulation and validatedexperimentally with a prototype of 16 W.
Design and Analysis of Voltage Clamped Bidirectional DC-DC Converter for Energy Storage Applications
Dr Ramanjaneya Reddy U, B. L. Narasimharaju, Ramanjaneya Reddy Udumula and Raveendhra Dogga
Source Title: IET Journal of Engineering, Quartile: Q1
A Cost-Effective Zero-Voltage Switching Dual- Output LED Driver
Dr Ramanjaneya Reddy U, Ramanjaneya Reddy Udumula and B. L. Narasimharaju
Source Title: IEEE Transactions on Power Electronics, Quartile: Q1
View abstract ⏷
Coupled-inductor (CI) converters are widely used in the light-emitting diode (LED) lighting applications due to several advantages, such as high step-down conversion, reduced switch/diode stress as compared to conventional buck converters. However, the main drawback of CI buck converter is high-voltage spikes during turn-OFF instant due to the leakage inductance of a CI, which leads to switching device failure. Passive clamp circuits are used to overcome the leakage inductance problem, but these clamp circuit's results in reduced efficiency and increased cost. This paper proposes a high step-down zero-voltage switching dual-output coupled-inductor buck (ZVS-DOCIB) LED driver with dimming control. The proposed LED driver provides various advantages like high step-down conversion, effective recovery of leakage energy, elimination of voltage spikes, reduced switching loss due to ZVS operation of both the switching devices, and less switching device count, particularly for multioutput drivers. Also, ZVS operation provides a significant reduction in switching losses, which results in high efficiency. Furthermore, dimming control is studied to regulate the average output currents. This paper presents design and analysis of the proposed ZVS-DOCIB converter. A prototype of the converter has developed and validated experimentally with simulation counterparts.
High step-down Dual output Light Emitting diode driver
Dr Ramanjaneya Reddy U, Ramanjaneya Reddy Udumula and Narasimharaju B L
Source Title: IJRER, Quartile: Q3
View abstract ⏷
A conventional power factor correction (PFC) based light emitting diode (LED) drivers composed of two-stage DCDC conversions has several drawbacks such as; increased system size due to more component count, less efficiency and
complex control etc. The grid powered LED lighting demand for high step-down conversion because the required voltage level
of LED light is very less. Thus, this work proposes a one-switch dual-output (OSDO) coupled-inductor buck (CIB) LED
driver. The OSDO-CIB converter can eliminates the drawbacks of conventional counterparts. The proposed OSDO-CIB
converter can provide various benefits such as; compact size, high efficiency, less total harmonic distortion (THD), simple
control, and a significant reduction in device voltage/current rating due to coupled inductors. The converter is designed with
discontinuous conduction mode (DCM) of operation in order to achieve in-phase current and voltage, high power factor (PF)
and a low THD. This paper mainly emphasized on detailed operating modes and steady-state analysis of proposed converter.
Further, prototype of the converter is built and experimental validations are presented.
Improved efficiency coupled inductor-buck AC-DC light emitting diode (LED) driver
Dr Ramanjaneya Reddy U, Ramanjaneya Reddy Udumula and Narasimharaju B L
Source Title: IEICE Electronics Express, Quartile: Q2
View abstract ⏷
This work proposes coupled inductor-buck (CI-B) power factor correction (PFC) LED driver. As compared with conventional buck converters, the proposed CI-B PFC converter has several advantages such as; high step-down conversion, reduced total harmonic distortion (THD), increased efficiency, achieves high power factor (PF), reduced current/voltage stress of switch/diode, and effective switch utilization factor. The proposed converter is designed to operate in discontinuous current mode (DCM) to achieve high power factor (PF) and low THD to comply IEC 61000-3-2 class C standards. In addition, a simple one-loop voltage mode controller (VMC) is implemented to achieve the desired regulated output voltage. A proto-type of 16 Watt converter is built and experimental validations are presented.
Unity power factor buck-boost LED driver for wide range of input voltage application
Dr Ramanjaneya Reddy U, Ramanjaneya Reddy Udumula and Narasimharaju B L
Source Title: 2015 Annual IEEE India Conference, Quartile: -
Modeling and analysis of voltage controlled positive output synchronous buck-boost converter
Dr Ramanjaneya Reddy U, Narasimharaju B L, G Bharma, V B Koreboina and Ramanjaneya Reddy Udumula
Source Title: 2015 Annual IEEE India Conference (INDICON), Quartile: -
View abstract ⏷
Now a day's use of portable devices increasing more. Such as cellular phones, digital cameras and high efficient power managing modules etc. are demanding for low output voltage ripple with fast transient response. The terminal voltage of the battery used in portable applications varies particularly depending on state of their charging conditions. In this paper, Li-ion battery is considered that provides 4.2V when it is fully charged and drops to 2.7V when fully discharged. However, the system requires a constant output voltage of 3.3V under varying load conditions. Thus, this work addresses the design and modeling of voltage controlled positive output synchronous buck-boost converter. Simulation model is developed using MATLAB/Simulink and results analysis has been carried out.
Optimized dual active bridge Bi- directional DC-DC converter for UPS application
Dr Ramanjaneya Reddy U, Narasimharaju B L, Prahlad V Venkata, Ramanjaneya Reddy Udumula, K Vijaybabu, Srinivasan P
Source Title: Power Electronics, Drives and Energy Systems (PEDES), Quartile: -
View abstract ⏷
With the growing emphasis on smaller compact and efficient power system there is increasing interest in the possibility of using Bi-directional converters especially in DC based power applications. Having the capability of bilateral power flow, that provides the functionality of two uni-directional converters in single converter unit; Bidirectional converters have the increased industrial applications; demand optimized study of topologies and feasibility, critical feature study for the considered application. This document suggests an optimized implementation of Bidirectional DC-DC converter to fit the present day UPS application. Key issues like compact design, utilisation of transformer core, optimised topology for low power (2.5kW) applications were discussed.
Enhanced closed loop voltage control of buck converter for improved performance
Source Title: 2014 Annual IEEE India Conference (INDICON), Quartile: -
View abstract ⏷
In this paper, author proposes study of two-loop voltage mode controlled (TVMC) buck converter for improved transient and dynamic performance under line and load disturbances. Buck converter with voltage mode control will improve efficiency, but transient response is sluggish. It requires large filter capacitor. Two-loop voltage control technique is proposed to improve output voltage regulation irrespective of line and load disturbances, and to achieve fast transient response. The two-loop voltage control technique has many advantages over conventional voltage mode control technique, such as fast transient response and reduced peak overshoot etc. Simulation model of TVMC buck converter is developed in MATLAB/Simulink and extensive result analysis has been made. The result analysis shows the effectiveness and significant improvement of the proposed control technique.
