Browsing by Author "Vinatha Urundady, U."

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A hybrid controller design for VSC-HVDC transmission system for PMSG based offshore wind farm
(IEEE Computer Society, 2017) Srikakulapu, R.; Vinatha Urundady, U.
Permanent magnet synchronous generator (PMSG) based offshore wind farm is connected to the onshore grid by voltage source converter (VSC) - HVDC link. The wind farm side VSC controls the AC voltage, and grid side VSC controls the reactive power and DC link voltage. This paper presents a non-linear control method for improving the robustness of the controller for VSC-HVDC link. A hybrid controller is designed using sliding mode control (SMC) and proportional-integral (PI) control. Mathematical modeling of the hybrid controller is presented. This hybrid controller has the capability of Fault Ride-Through and transient stability of VSC-HVDC link. This hybrid controller is simulated using the MATLAB/Simulink software and it is observed that the controller provides better performance. Transient stability is ensured by creating a symmetrical fault at the grid side in the simulation. Â© 2017 IEEE.
A Novel Dual-Input Single-Output High-Gain DC-DC Converter for Interfacing Fuel Cell with High-Way Charging Station Applications
(Institute of Electrical and Electronics Engineers Inc., 2025) Diwakar Naik, M.D.; Vinatha Urundady, U.
This article presents a novel dual-input single-output high-gain dc-dc converter designed specifically for interfacing fuel cells (FCs) with high-way charging station applications. The converter boasts several notable features, including high output voltage gain achieved with only two switches, continuous input current, reduced switch stress, and the ability to provide a reliable continuous power supply. This article elucidates the two operating modes of the converter along with their corresponding switching states. In addition, it delves into the design and analysis of the proposed converter, covering various aspects, such as the development of a state-space model and the derivation of the small-signal transfer function to comprehend the dynamic behavior of the converter. Moreover, a suitable control strategy using the k-factor method has been devised to effectively regulate the output voltage and ensure stability, even in the face of input voltage fluctuations. To validate the effectiveness of both the proposed converter and controller, a 150-W prototype was meticulously constructed and experimentally verified in a laboratory setting. © 2024 IEEE.
A Novel Single-Switch High-Gain DC-DC Converter With Active Switched Inductor
(Institute of Electrical and Electronics Engineers Inc., 2024) Diwakar Naik, M.; Vinatha Urundady, U.
This brief presents a non-isolated, novel single-switch high-gain DC-DC converter with an active switched inductor (NSSHG-ASI) designed for fuel-cell and photovoltaic (PV) powered systems. It features a quadratic boost converter structure at the front end, followed by an active switched inductor that aids in boosting the voltage levels. This brief covers the steady-state analysis and dynamic modeling of the proposed converter. Furthermore, an effective control strategy has been developed, leveraging the K-factor method, to operate the converter in voltage control mode. This ensures stability, even in the event of significant variations in input voltage. To validate the efficacy of the proposed converter and controller, a practical 110W prototype was meticulously constructed and rigorously tested within a controlled laboratory environment. © 2004-2012 IEEE.
A study on hybrid Renewable Energy Source interface to the non-ideal grid at distribution level with power quality improvements
(Institute of Electrical and Electronics Engineers Inc., 2016) Jayasankar, V.N.; Gururaj, M.V.; Vinatha Urundady, U.
Air pollution is one of the prominent issues that we are facing nowadays. The major contributor for air pollution is the waste output of power plants which uses fossil fuels to generate power. Urbanization and industrialization have changed the lifestyle of human society and the need for electrical energy has enhanced significantly. As the conventional energy sources are not capable of serving the purpose, the researchers have turned their face towards Renewable Energy Sources (RES). Energy sources are scattered across the globe, therefore the available green energy at the distribution level is also used to generate electricity. The hybrid combination of wind/solar systems has proved to be a reliable source to the utility. For extracting maximum power from the RES, battery bank is connected across it. Due to the problem associated with the chemical batteries the wind/solar hybrid combination is directly connected to the grid. There are many issues related to the interconnection of RES to the grid which are addressed with the growth in power electronics field. However the power quality issue occurs due to the presence of non-linear loads at the point of common coupling. Shunt active filter has proved to mitigate the problems associated with the non-linear loads. Researchers have limited their work to interconnection of RES to ideal grid voltages which is not the practical case. In this paper the wind/solar hybrid system is modeled and is interconnected to the unbalanced and distorted grid. Also, RES interfacing inverter is added with shunt active filter functionality and hence overall cost curtailment of the project can be achieved. Â© 2016 IEEE.
Advanced control approach for shunt active power filter interfacing wind- solar hybrid renewable system to distribution grid
(Engineering and Scientific Research Groups 82 Rue Baudricourt 75013 Paris, 2018) Jayasankar, V.N.; Vinatha Urundady, U.
Renewable energy systems utilize the locally available energy resources and generate green energy to meet the increasing load demand. Grid integration of renewable energy systems using power electronic interfaces is the latest trend in this area of research. The non-linear loads at load centers inject current harmonics to the distribution grid at the point of common coupling and pollute the grid. The mitigation of current harmonics in the distribution grid along with the integration of renewable energy systems to the grid is the main focus of discussion in this paper. The interconnection of a hybrid solar-wind renewable energy system with the grid at the distribution level, using a voltage source inverter is presented in this paper. The inverter is controlled using the synchronous reference frame theory based control algorithm, by which the grid interfacing inverter gets additional responsibilities of shunt active power filter. Grid interfacing system consists of a 3-phase, 4-leg voltage source inverter, a dc-link capacitor and a hysteresis current controller. A self-tuning filter is designed and used in the control system for effective elimination of current harmonics. Simulation results are presented with variation in the renewable energy generation and variation in load for validating the practical application of the proposed system. All simulations are done in MATLAB-Simulink platform. The performance of 4-leg inverter in exchanging real power from renewable sources to grid along with compensating current harmonics, under balanced and unbalanced grid voltage conditions are analyzed. © JES 2018.
Backstepping Controller with Dual Self-Tuning Filter for Single-Phase Shunt Active Power Filters under Distorted Grid Voltage Condition
(Institute of Electrical and Electronics Engineers Inc., 2020) Jayasankar, V.N.; Vinatha Urundady, U.
This article presents the design and hardware implementation of an adaptive nonlinear controller for fast, robust, and stable control of single-phase shunt active power filter. The proposed control system consists of two control loops: an inner harmonic current compensation loop and an outer dc-voltage control loop. The inner loop is realized using self tuning filter based instantaneous power theory (pq theory). The limitations of conventional low-pass filter based fundamental component extraction methods are overcome using self-tuning filter. The outer loop is realized backstepping controller (BSC). The limitations observed in existing dc-link voltage controllers like poor stability margin, steady state error, chattering problem, etc., are overcome by the proposed BSC. The switching loss estimation is introduced in BSC using design estimation rules to enhance the dc-link loss compensation capability. The stability of the system with the proposed controller is studied using Barbalat lemma. A laboratory prototype of BSC based shunt active power filter is implemented. The control algorithm is implemented in a single all on chip field programmable gate array (FPGA). To ensure the effectiveness of the controller in mitigating the harmonic currents and controlling dc-link voltage, the control algorithm is tested under steady state and dynamic conditions. © 1972-2012 IEEE.
Combined approach based on ACO with MTSP for optimal internal electrical system design of large offshore wind farm
(Institute of Electrical and Electronics Engineers Inc., 2018) Srikakulapu, R.; Vinatha Urundady, U.
The wind turbine (WT) layout and electrical system layout plays a vital role in offshore wind farm (OWF) design. The wake effect has a significant impact on the power production of the OWF. WTs in wake region will not experience healthy wind; hence it affects the power production. The proper placement of WTs can reduce the wake effect in OWF. The optimal design of large OWF is based on combined approach of Ant colony optimization (ACO) with multiple travelling salesmen problem (MTSP) is presented. The objectives of the approach are to improve power production, minimize the length of cable and cable cost. By considering (a) placement of WT with consideration of wake effect, (b) placement of substation, (c) selection of submarine cables with higher reliability and minimal power loss, and (d) minimum length of WT cable routing with zero cross connection. ACO-MTSP approach is applied on large OWF connected with 280 WTs and results are compared with the outcome of reference OWF. Â© 2018 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.
Design and FPGA Implementation of Dual Self-Tuning Filter based Controller for Single Phase Shunt Active Filter
(Institute of Electrical and Electronics Engineers Inc., 2019) Bhat, P.G.; Shetty, D.R.; Jayasankar, V.N.; Vinatha Urundady, U.
The use of power electronic devices injects harmonics into the grid causing serious power quality problems. To limit the current harmonics in accordance with IEEE Std 519, Shunt Active Power Filter (SAPF) may be used. Instantaneous power theory (pq theory) is widely used for current harmonic mitigation in SAPF. The Low Pass Filter (LPF) is used in pq theory based controllers for fundamental component extraction. The drawbacks of LPF are additional phase delay at the fundamental frequency and presence of lower frequency oscillations. A dual Self-Tuning Filter based controller is proposed to overcome these limitations. The simulation studies under different system conditions are carried out using MATLAB/SIMULINK to verify the effectiveness of the proposed method. The hardware cosimulation using ZedBoard Zynq-7000 Development Board is carried out to validate the simulation results. Â© 2019 IEEE.
Design of a hybrid controller based on GA-SMC for the multi-terminal VSC-HVDC transmission system
(Institute of Electrical and Electronics Engineers Inc., 2018) Srikakulapu, R.; Vinatha Urundady, U.
This paper explains a hybrid control approach to model a controller for voltage source converters (VSCs) in offshore wind farm (OSWF) applications, where the OSWFs are integrated to AC grid through the multi-terminal high voltage direct current (MT-HVDC) transmission system. Proper DC link voltage provides the effective power dispatch. So, a constant DC link voltage should be maintained to achieve the effective power dispatch between OSWFs and AC grid. A new control approach is a compound of proportional-integral and sliding mode control to regulate the DC link voltage on the grid side VSC. Also, the proposed control approach can control AC voltage and reactive power on wind farm and grid side VSCs respectively. Time- domain simulations executed in MATLAB/Simulink software are used to verify the proposed and conventional control approaches. Transient stability analysis is carried out for a case study. The three-terminal VSC-HVDC system has taken for study, where two OSWFs are fed to AC grid. Â© 2018 IEEE.
Design of Backstepping Controller for a Three-phase Shunt Active Filter Interfacing Solar Photovoltaic System to Distribution Grid
(Institute of Electrical and Electronics Engineers Inc., 2018) Jayasankar, V.N.; Vinatha Urundady, U.
This paper presents a controller for a three-phase four-leg shunt active power filter (SAPF), interfacing solar photovoltaic system to distribution grid. The controller consists of a non-linear, robust dc-link voltage control loop based on backstepping algorithm. It also consists of a current harmonic mitigation loop based on dual self tuning filter instantaneous power theory (DSTF-pq theory). The limitations of conventional pq theory based current harmonic mitigation controller are addressed in this paper by employing self tuning filters (STF) to extract the fundamental components of load currents and grid voltages. The effectiveness of the algorithm under steady state and dynamic conditions are comprehensively studied and evaluated in MATLAB/Simulink. The proposed controller is implemented in XC7a35t-cpg236-1 FPGA. The performance of the controller is tested and verified on a laboratory prototype of shunt active power filter. Â© 2018 IEEE.
Design of backstepping controller for PV-wind hybrid system with grid-interfacing and shunt active filtering functionality
(Inderscience Enterprises Ltd., 2018) Jayasankar, V.N.; Vinatha Urundady, U.
This paper presents the design of a double loop controller for the grid interconnection of PV-wind hybrid system with shunt active filtering and neutral current compensation capabilities. Using Lypunov stability theory-based procedure, a backstepping controller is designed for the outer loop DC link voltage control. The adaptive nature of back stepping controller results in better dynamic performance compared to conventional controllers. Inner loop consists of instantaneous power theory-based controller for harmonic current compensation. Instantaneous power theory is modified by employing positive sinusoidal sequence regulator and self-tuning filter to improve the system performance in unbalanced and distorted grid voltage conditions. A dynamic model of the system is considered for the design. Numerical simulations are done in MATLAB/Simulink platform for different system conditions to verify the effectiveness of controller in grid interfacing of renewable sources, and the shunt active filtering. © © 2018 Inderscience Enterprises Ltd.
Development of wave turbine emulator in a laboratory environment
(2013) Vinatha Urundady, U.; Vittal, K.P.
Wave turbine emulator (WTE) is an important equipment for developing wave energy conversion system. The emulator reflects the actual behavior of the wave turbine by reproducing the characteristics of real wave turbine without reliance on natural wave resources and actual wave turbine. It offers a controllable test environment that allows the evaluation and improvement of control schemes for electric generators. The emulator can be used for research applications to drive an electrical generator in a similar way as a practical wave turbine. This article presents the development of a WTE in a laboratory environment and studies on the behavior of electrical generator coupled to the emulator. The structure of a WTE consists of a PC where the characteristics of the turbine are implemented, ac drive to emulate the turbine rotor, feedback mechanism from the drive and power electronic equipment to control the drive. The feedback signal is acquired by the PC through an A/D converter, and the signal for driving the power electronic device comes from the PC through a D/A converter.
Electrical collector topologies for offshore wind power plants: A survey
(Institute of Electrical and Electronics Engineers Inc., 2016) Srikakulapu, R.; Vinatha Urundady, U.
This paper gives an overview of various collector topologies for offshore wind farms. A comparative analysis of different DC and AC collector system topologies for offshore wind power plant are presented. The advantages and disadvantages of collector system topologies in terms of cost, reliability and efficiency are discussed. The paper discusses various updated collector topologies like radial, single sided ring, double sided ring, star and hybrid AC-DC etc. in AC collector systems and series, parallel, hybrid and matrix interconnected topology etc in DC collector systems. At the end alternative topologies based on bypassing method for radial, double sided topology are explained. Â© 2015 IEEE.
Enhancement of load voltage compensation using positive sinusoidal sequence regulator in fuzzy logic controlled three phase series active filter
(Institute of Electrical and Electronics Engineers Inc., 2018) Jayasankar, V.N.; Kumar, N.B.; Vinatha Urundady, U.
This study proposes a controller for series active Alter for enhancement in load voltage compensation. The controller consists of a positive sinusoidal sequence regulator based fundamental voltage calculator, a closed loop fuzzy logic based voltage controller and a pulse width modulation controller. Positive sequence sinusoidal signal regulator effectively eliminates the phase delay introduced while calculating fundamental voltage. Numerical simulations are done for different cases to verify the effectiveness of controller under different system conditions. Â© 2017 IEEE.
FPGA based experimental evaluation of BLDC motor drive fed from coupled inductor based bridgeless SEPIC
(Institute of Electrical and Electronics Engineers Inc., 2020) Prabhu, P.; Vinatha Urundady, U.
This paper presents FPGA based experimental evaluation of BLDC motor drive fed from single-phase supply through coupled inductor based bridgeless SEPIC converter. This converter supplies an adjustable DC link voltage to the input of three-phase VSI, which serves as electronic commutator for the BLDC motor. The VSI is switched at the fundamental frequency determined by rotor position, and the variable DC link voltage provides adjustable speed (N\propto V-{dc}) in the proposed BLDC motor drive. The incorporation of coupled inductors for bridgeless SEPIC achieves compactness. The converter with coupled inductors ensures a similar performance with reduced size as that of the conventional bridgeless SEPIC. The bridgeless SEPIC incorporating coupling presented in this work has the improved features of compact size, reduced structure complexity, requirement of only one low side gate driver and the absense of circulating current. The converter can provide both supply current shaping and control of output voltage with only voltage control loop. The Artix 7, Xilinx FPGA is used to implement the control system consisting of electronic commutation logic for switching the VSI and PI controller based DC link voltage controller for switching the proposed front end converter. The control logic is implemented using Xilinx System Generator (XSG), model-based design tool in MATLAB/Simulink environment. The XSG model-based design is processed in Vivado Design Suite software to generate programmable bit file for FPGA. The experimental results are obtained to validate the achievement of adjustable speed and shaping of supply current in the proposed BLDC motor drive. Â© 2020 IEEE.
FPGA-Based Implementation of Backstepping Controller for Three-Phase Shunt Active Power Filter Interfacing Solar Photovoltaic System to Distribution Grid
(Springer Science and Business Media Deutschland GmbH, 2021) Jayasankar, V.N.; Vinatha Urundady, U.
The design and implementation of a controller for a solar photovoltaic system interfacing to the grid with shunt active power filter functionality are discussed in this paper. An inner harmonic current compensation loop and an outer dc voltage control loop constituted the control system. The inner loop is realized using a self-tuning filter (STF) based on instantaneous power theory, and the outer loop is realized using backstepping algorithm. The control algorithm is simulated under dynamic system conditions namely change in solar irradiation and change in load, in Matlab/Simulink environment. To ensure the effectiveness of the controller in mitigating the harmonic currents and interfacing solar PV system with distribution grid for real power exchange, the control algorithm is tested under steady-state and dynamic conditions and validated with the simulation results. The control algorithm is then implemented using a single all on-chip FPGA. Hardware co-simulation is carried out with the control system implemented in FPGA, and shunt active filter power circuit simulated in Matlab/Simulink. The hardware co-simulation results obtained are matching with the Matlab simulation results under dynamic system conditions and the controller design using FPGA is validated. Â© 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
High-gain DC-DC converter with zero input ripple current : Design and Analysis*
(Institute of Electrical and Electronics Engineers Inc., 2023) Mishra, S.; Shetty, S.; Vinatha Urundady, U.
In this paper, a non-isolated high-gain dc-dc converter that utilizes switched-capacitor and switched-inductor (SC-SL) network is proposed and thoroughly analyzed. The proposed topology features a single switch and less number of passive elements as compared to recently emerged high-gain converters. The mathematical analysis of the proposed converter is carried out to find the converter voltage gain and stresses on power devices.The converter achieves a gain of nine times at 50% duty cycle with comparatively less voltage stress on power devices. Additionally, the converter encompasses the current mirror ripple cancellation circuit (CMRCC) to eliminate input current ripples. The converter is modelled and verified in continuous conduction mode(CCM) using MATLAB/SIMULINK. The obtained findings exhibit that the input current ripples are effectively eliminated by the CMRCC implementation. Â© 2023 IEEE.
High-Gain Nonisolated DC–DC Converter with Zero Input Current Ripple for Fuel Cell Electric Vehicles
(Institute of Electrical and Electronics Engineers Inc., 2025) Shetty, S.; Mishra, S.; Vinatha Urundady, U.
This paper presents a novel single-switch, common-ground high-gain DC–DC converter for vehicular applications, integrating a Current Mirror Ripple Cancellation Circuit (CMRCC) to achieve a continuous input current with negligible ripple. The proposed power stage incorporates one switched inductor–capacitor (SLC) cell and one switched capacitor (SC) cell, along with a clamping circuit to reduce voltage stress on the switching device, thereby enhancing efficiency and reliability. This configuration delivers high voltage gain while maintaining control simplicity through a single-switch design and minimizing electromagnetic interference via the common-ground structure. A comprehensive theoretical analysis is provided, covering voltage gain, efficiency, component stress, and open-loop stability. A 48 V/400 V, 350 W laboratory prototype was developed to validate the proposed design under dynamic load and source variations, achieving a peak efficiency of 94.4%, an input current ripple below 1%, and a transient deviation of less than 10% under 30% load and 20% source step changes. These results confirm that the proposed integrated approach offers a compact, high-performance, and application-ready solution for electric vehicle powertrains and renewable energy systems. © 2015 IEEE.
Hybrid PV/wind energy system with a centralized DC bus architecture and power regulation
(Institute of Electrical and Electronics Engineers Inc., 2016) Sherpa, L.; Vinatha Urundady, U.; Rai, B.
This paper presents a model of hybrid energy system (HES) consisting of wind energy system (WES) and solar photovoltaic (PV) solar system connected with the grid and its performance is examined under load variation and systems input parameters. A centralized DC bus Architecture power generation is used for the proposed HES that includes a Shockley diode equation PV array and wind turbine driven by a PMSG, along with a separate DC-DC converters, a three-phase diode rectifier bridge, a dc bus and voltage source inverter (VSI) with a current regulated PWM. For a proper interfacing with the grid a suitable power conditioning system has to be implemented. The utility grid generally requires the generation of high quality electric power. A three-phase DCAC voltage source inverter (VSI) using IGBTs is employed in interfacing with the grid through sinusoidal pulse width modulation (PWM) techniques. The main objective in this paper is the analysis of HES interfaced with grid and with PQ control technique of VSI output and filtering out the high frequency harmonics produced at inverter terminal using LC filter. The performances of proposed HES are examined under dynamic conditions such as changes in input parameters and changes in load. The applicability of these HES is completely modeled and analyzed in MATLAB/Simulink environment and output results obtained are examined to be of satisfactory. Â© 2015 IEEE.