Faculty Publications
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Item Solar Distillation and Water Heating Systems Integration with Photovoltaic Technology(Springer, 2024) Dev, R.; Kashyap, Y.; Tewari, K.; Pal, P.Solar energy is a renewable source with three major applications: photovoltaics (PV), thermal, and daylight. A photovoltaic cell has a conversion efficiency of around 16–35%, depending upon its fabrication technology. Hence, it is observed that ~65–84% of incident solar radiation is lost as thermal energy to the surroundings. At the same time, solar thermal has vast applications, e.g., solar water heating, solar greenhouse drying, solar greenhouse crop cultivation, solar distillation, solar aquaculture, etc. Solar thermal applications have a thermal efficiency of around 20–45% depending upon fabrication materials, design, operating, and weather conditions. Integrating photovoltaic and thermal applications proved advantageous over their application with better overall efficiency. Over the years, many researchers have developed various concepts integrating these technologies to get more output, cost, and land use benefits. This chapter elaborates on different ‘PV-integrated solar distillation systems’ and ‘PV-integrated solar water heating systems’ with working principles and performances. © 2024, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.Item A novel technique for control of Cascaded multilevel inverter for photovoltaic power supplies(IEEE Computer Society, 2005) Naik, R.L.; Udaya Kumar, R.Y.Multilevel voltage source inverters offer several advantages compared to their conventional counterparts. By synthesizing the AC output terminal voltage from several levels of voltages, staircase wave forms can produced, which approach the sinusoidal wave form with low harmonic distortion, thus reducing filter requirements. The need of several sources on the DC side of the converter makes multilevel technology attractive for photovoltaic applications. The basic modulation techniques enable harmonic elimination by predetermination of the switching angles. This is determined according to a previously calculated and stored pulse width modulated waveform. It has the advantage of operating at fundamental frequency switching. However, this technique is seriously limited as the number of levels increases because of the increased complexity and the reduced accuracy of the non-linear solutions. This paper proposes a novel Multilevel PWM technique (phase-shifted sinusoidal PWM) to over come all these limitations while maintaining switching at fundamental frequency, found better THD. Simulation results are presented in the paper.Item Modeling and performance analysis of hybrid fuel cell and microturbine based distributed generation system, 'A review'(2013) Nayak, S.K.; Gaonkar, D.N.The hybrid fuel cell and microturbine based distributed generation(DG) systems are predicted to play an important role in power distribution network in the near future. There are several models of hybrid DG sources such as, wind turbine generation with photovoltaic, tidal with geothermal, fuel cell with gas turbine, stealing engine with fly wheel and many more. Among all these source of DG fuel cell and microturbines are the well suitable hybrid DG system due to their power matching, size and operational relation. This paper presents the current status and future development of hybrid fuel cell and microturbine generation system and the research work of various issues related to their interconnection, operation and control in connected to the power distribution network. © 2013 IEEE.Item Effect of shading on PV panel technology(Institute of Electrical and Electronics Engineers Inc., 2018) Tripathi, A.K.; Murthy, C.S.N.Solar photovoltaic energy conversion has gained much attention nowadays. The performance of solar photovoltaic system mainly depends on the solar radiation falling on the panel surface. Shading across the panel surface is the main cause for the degradation of its performance. It was found that due to 25% shading strength in mono crystalline PV panel the reduction in short circuit current and maximum power output was respectively 40.72% and 41.40%. Similarly, the reduction in short circuit current and maximum power output was 60.86% and 61.80%, respectively for poly crystalline panel. Under the same level of shading the monocrystalline PV panel shows less reduction in its performance when compared to poly crystalline PV panel. © 2017 IEEE.Item Modified Hysteresis Current Control for Single Phase Solar Grid-tie Z-Source Inverter(Institute of Electrical and Electronics Engineers Inc., 2018) Damodaran, R.; Balasubramanian, B.; Mudlapur, A.; Ramana, V.V.; Mishra, S.This paper proposes a simple novel technique to determine the shoot-through states in a hysteresis controlled solar grid connected single phase Z-source inverter (ZSI). The ZSI along with the proposed controller exhibits high efficiency due to the single stage conversion. Fast and robust dynamic response can be obtained by using hysteresis control. Hence the proposed control for ZSI is ideal for grid integration of photovoltaic sources. The error current is used to determine shoot-through states based on calculation of current limits as a function of the boost ratio and modulation index. The maximum boost ratio, that can be obtained by the proposed control without causing low frequency ripples in Z-source network, is expressed as a function of modulation index. To verify the analysis, simulations are performed for input and grid voltage variations using MATLAB-Simulink platform. © 2018 IEEE.Item Bifacial Solar PV Systems: A Sustainable Solution for Energy-Intensive Industries(Institute of Electrical and Electronics Engineers Inc., 2024) Bojja, S.K.; Kunar, B.M.; Murthy, Ch.S.N.Energy-intensive industries and mineral-based industries demand a considerable quantity of power for numerous uses. This is a big challenge because these procedures need a continuous and constant energy source, which requires an uninterrupted power supply. In theory, industries complement, replace, or lessen the effects of using fossil fuels by utilizing renewable energy, carbon capture, and energy recovery. However, combining renewable energy sources, such as solar power, can significantly lower overall operating costs and carbon emissions to meet the energy needs of different industrial applications. This study describes the installation, for research purposes, of a prototype bifacial solar PV system (BSPV) equipped with a pumping motor. A BSPV system is being investigated because its output energy will be higher than that of monofacial solar cells. BSPV systems use less space than monofacial ones while still producing the same power and being less expensive as well. © 2024 IEEE.Item A novel MPPT controlled grid-connected photovoltaic system with dual functionality of active power injection and reactive power compensation in a single phase system(Universitatea Politehnica din Timisoara blucretiu@yahoo.com, 2012) Naik, A.; Yaragatti, R.Y.This paper deals with the study of integration of distributed generation with active power filtering functionality in a single- phase system. Here the active power generated by the photovoltaic (PV) system is injected into the grid system through a coupling capacitor whenever solar input is available and the remaining capacity of the power conditioning inverter is used to compensate for the reactive power demand. The control algorithm used in this paper is simple and easy to implement. The PV system is integrated through a novel and simple MPPT technique. The system is simulated and analyzed for a given non-liner load with and without renewable source at different atmospheric conditions using MATLAB/Simulink tool. The grid current becomes sinusoidal and in phase with the grid voltage and hence the source current THD is reduced to great extent.Item Modeling a grid connected photovoltaic system with perturb and observe based maximum power point tracking(2013) Naik, A.; Yaragatti, U.This article deals with the integration study of distributed generation (DG) in the form of a photovoltaic (PV) plant in a three-phase system. Here the active power generated by the photovoltaic (PV) plant is injected into the grid system through a current controlled dual inverter topology. The main contribution in this article is the dual inverter topology. In this topology, a three level inverter output is obtained which reduces the PV injected current harmonic distortion into the grid. The control algorithm used in this article is simple and easy to implement. The PV system is operated through a maximum power point tracking (MPPT) stage. Perturb & Observe (P&O) is the modeling approach of MPPT system operation. The system is simulated and analyzed for a different set of loads with renewable source at different atmospheric conditions using MATLAB/ Simulink tool. The grid current becomes sinusoidal with three levels inverter and compared to existing three levels methods the dual inverter method is simple and easy to implement.Item Investigations on interconnection of wind-solar hybrid Renewable Energy Source to the ideal grid at the distribution level together with power quality improvement features(Universitatea Politehnica din Timisoara blucretiu@yahoo.com, 2015) Gururaj, M.V.; Vinatha Urundady, U.one of the most challenging issues that modern man is facing nowadays is global warming and scarcity of fuel. To find a solution to the above problems the focus of research is directed towards Renewable Energy Sources (RES). Among all available RES the combination of wind-solar RES provides the most reliable solution to the utility as both of them are complimentary to each other. As all the energy sources including RES are scattered across the globe, it becomes necessity to extract available green energy at the distribution as well. Non-linear loads connected at the Point of Common Coupling (PCC) inject current harmonics into the system thereby pollutes the grid environment. Shunt active power filter is found to be one of the feasible solutions in addressing issues related to the non-linear loads. This paper deals with the study of integration of wind-solar hybrid energy system to the grid at the distribution level. Here the active power filter functionality has been added to the interfacing four leg inverter to reduce overall cost of the system. The system is studied under three different cases of RES=0, Load Demandd-Iq control strategy.Item Accurate parametrization and methodology for selection of pertinent single diode photovoltaic model with improved simulation efficiency(Elsevier Ltd, 2018) Gudimindla, H.; Sharma K, M.An accurate model of photovoltaic (PV) panel is indispensable for simulations studies. In general, the PV circuit parameters for simulation studies are extracted from the manufacturer's data sheet under different environmental conditions. The PV characterizing equations are nonlinear and requires a more involved computation. This paper presents a fast convergent third order Newton-type method to solve such nonlinear equations and thereby, to accurately parameterize any of the possible PV circuit models. The applicability and suitability of the proposed method are demonstrated through modeling of multi and mono-crystalline PV cells. Further an algorithm to evaluate the efficacy of the available methods and the proposed method is presented. PV characteristics of the suitable circuit model at various levels of temperature and irradiation are also examined. Finally, the effectiveness of the developed method is comprehensively assessed through comparison with the most recent and available effective techniques by considering various performance indices based on current-voltage, power-voltage curves and experimental data is carried out. © 2018 Elsevier Ltd