Faculty Publications
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Item Interconnection of wind-solar hybrid Renewable Energy source to the 3 phase-3 wire distribution system along with power quality improvements at the grid side(Institute of Electrical and Electronics Engineers Inc., 2015) Gururaj, M.V.; Vinatha Urundady, U.; Jayasankar, V.N.Scarcity of power has been one of the nightmare issues for mankind in the modern age. Renewable Energy Sources (RES) working parallel with conventional power plants are playing a lead role in narrowing the difference between supply and demand. Among all the available renewable energy sources wind-solar hybrid systems are the most popular one. Due to their natural advantage of being complimentary to each other, they are assuring reliability to the utility. Power quality issues arising due to the usage of non-linear loads at the point of common coupling are addressed with the help of power electronic device interfacing RES to the grid. The work presented in this paper consists of Modeling and Simulation of wind-solar hybrid energy system and interfacing it to the grid through the interfacing inverter. A suitable control strategy which will add shunt active filter functionality to the RES interfacing device to the grid is also undertaken. © 2015 IEEE.Item Implementation of adaptive fuzzy controller in a grid connected wind-solar hybrid energy system with power quality improvement features(Institute of Electrical and Electronics Engineers Inc., 2016) Jayasankar, V.N.; Vinatha Urundady, U.Energy demand increases rapidly, utilization of renewable energy resources plays an important role in narrowing down the supply-demand difference. Introduction of more power electronic devices and non-linear loads pollutes the grid and create power quality problems. Both the scarcity of energy problem and power quality problem can be simultaneously solved by using the grid interfacing inverter of renewable sources, as a shunt active filter. A suitable control strategy has to be used for giving grid interfacing inverter, the power of power quality improvement. Conventional PI controller can be replaced with a fuzzy controller for better control, and thus improve the system performance. In this paper, a grid connected hybrid system of wind-solar with power quality improvement features is simulated with a PI controller, and then results are compared by replacing PI with fuzzy controller. © 2016 IEEE.Item 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. © 2016 IEEE.Item Wind-solar grid connected renewable energy system with series active self tuning filter(Institute of Electrical and Electronics Engineers Inc., 2016) Aravind, S.; Vinatha Urundady, U.; Jayasankar, V.N.In the present scenario energy resources are being used at an alarmingly high rate. In order to ensure that younger generations are not deprived of their energy usage, India now considers wind and solar as an alternative for future energy demands. In India incidence of solar energy in land area alone is 5000 trillion kilowatt hours which exceeds the energy outcome of all possible non renewable energy reserves in India. Next higher potential after solar comes from wind which can be used for both distributed generation or grid interactive power generation using on-shore or off shore technologies. Wind/solar hybrid RES is integrated to grid using grid interface inverter which contains power electronic switches operating at high frequency. This switching may induce harmonics and unbalances in voltage and current in the grid side. Moreover with the advancement in technology a large number of power electronics based loads are used which degrades quality of power in the load side. This paper deals with modeling work and simulation of wind-solar hybrid RES and interfacing it to the grid with a power quality improvement feature. The grid interface inverter also acts as hybrid series active filter (HSAF) with Synchronous Reference Frame (SRF) method employing Self Tuning Filter (STF) to mitigate problems related to voltage unbalance and voltage harmonics in the grid side. It also makes a comparison between the conventional low pass filter and self tuning filter. A reduction in Total Harmonic Distortion (THD) could be observed with Self Tuning Filter. © 2016 IEEE.Item 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. © 2017 IEEE.Item 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. © 2018 IEEE.Item 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. © 2019 IEEE.Item PI Control Based DC Link Voltage Controller for Grid Integrated Domestic Photo Voltaic Systems(Institute of Electrical and Electronics Engineers Inc., 2019) Kumar, N.B.; Jayasankar, V.N.; Vinatha Urundady, U.The increasing energy demand and finite reserve for fossil fuel sources have led the humankind to rely on renewable energy sources. The availability of solar energy in large quantities and the increased environmental awareness among the users boosted its popularity. Grid integration of renewable source is preferred over the islanded mode of operation as there is no need for additional energy storage devices. This paper presents a proportional integral control based DC link voltage controller for grid-integrated domestic photovoltaic systems. Incremental Conductance method to extract maximum power from solar PV system, instantaneous pq theory based dual STF for fundamental component extraction, hysteresis current control method for generation of switching pulses to the inverter are the added features of this work. The grid integrated Solar PV system along with control features is modelled and simulated in MATLAB/Simulink platform. Numerical simulations are done for various system conditions. The results of the power flow study and harmonic analysis are reviewed and summarised. © 2019 IEEE.Item 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. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item 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.