Conference Papers
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Item Combined model of fuel cell and microturbine based distributed generation system(2011) Nayak, S.K.; Gaonkar, D.N.; Kumar, A.S.Distributed Generation (DG) play an active role in the distribution network due to its minimum loss, maximum efficiency and environmental impact. Moreover DG can supply base load power which improves the system stability, reliability and power quality. Among the different combined DG systems like solar with wind, tidal with geothermal and others, fuel cell with microturbine is the most economical due to fuel flexibility and inner relation between each other. The hybrid system can utilize exhaust fuel and heat from fuel cell to increase the system efficiency. This paper investigates combined model solid oxide fuel cell/microturbine generator (SOFC/MTG) hybrid system, in which the anode exhaust of SOFC contains reminder of fuel. The exhaust hot gas and waste fuel are mixed with fresh fuel and compressed air is burned inside the burner. The pressurized hot gas from the combustor is expanded through turbine driving the Permanent Magnet Synchronous Machine (PMSM). The governing schemes of combined SOFC/MTG (Fuel & air flow) are controlled by the DC link voltage and current. The generated power of MTG is converted to AC/DC/AC to combine with fuel cell and frequency conversion. The hybrid model of SOFC/MTG with power converter is developed in MATLAB/Simulink library and simulation result shows transient response of hybrid SOFC/MTG DG system. © 2011 IEEE.Item Performance study of grid connected fuel cell based distributed generation system with ultracapacitor(2011) Kumar, A.S.; Gaonkar, D.N.; Nayak, S.K.Fuel cell based power generation is becoming one of the promising distributed generation system Fuel cell system can generate power as long as fuel is supplied However fuel cells cannot respond quickly to sudden load change due to slow dynamic response. Hence energy storage system is required during transient period In this paper a grid connected fuel cell system performance is studied considering the ultracapacitor as energy storage device. To interface ultracapacitor with fuel cell bidirectional converter is used Simulation results presented here show that the bidirectional converter effectively controls power flow from ultracapacitor. The dynamic responses of the fuel cell system under different load conditions are presented The results presented in this paper demonstrate the load transient mitigation capability of ultracapcitor. © 2011 IEEE.Item Fuzzy logic controlled microturbine generation system for distributed generation(Elsevier Ltd, 2012) Nayak, S.K.; Gaonkar, D.N.; Shivarudraswamy, R.The microturbine based Distributed Generation (DG) system are becoming the popular source of power industries due to their fuel flexibility, reliability and power quality. The microturbine generation (MTG) system is a complicated thermodynamic electromechanical system with a high speed of rotation, frequency conversion and its control strategy. In spite of several techniques to control high speed of microturbine is not accurate and reliable due to their anti-interference problem. To resolve the anti-interfacing problem, this paper investigates the fuzzy logic based speed governor for a MTG system as an alternative to nominal PI or lead-lag based controller. The development of fuzzy logic based speed governor includes input and output membership function with their respective members. The load variation on MTG system is performed using conventional and fuzzy logic controller, implemented in Matlab/simulink and results are compared with each other. The simulation result shows that, the performance improvement of fuzzy logic governor over a nominal governor based MTG system. © 2011 Published by Elsevier Ltd.Item Coordinated voltage control in 3 phase unbalanced distribution system with multiple regulators using genetic algorithm(Elsevier Ltd, 2012) Shivarudraswamy, R.; Gaonkar, D.N.; Nayak, S.K.The continued interest in the distributed generation in recent years is leading to a number of generators connected to distribution network. The introduction of DG in the distribution system changes the operating features and has significant technical impact. One of the main obstacle for high DG penetration in the distribution feeder is the voltage rise effect. Present network design practice is to limit the generator capacity to a level at which the upper voltage limit is not exceeding; this reduces the efficiency of DG system. This paper presents an efficient algorithm for voltage control in 3 phase unbalanced system with multiple voltage regulators. The genetic algorithm is successfully applied on 13 bus unbalanced radial system for different load conditions to control the voltage level. The voltage profiles are improved & are within the specified limits with optimal setting of voltage regulators like Load ratio transformer (LRT), Static Var Compensator (SVC), Shunt Capacitor (SC) and DGs reactive power for providing smooth voltage profiles at all the load conditions. © 2011 Published by Elsevier Ltd.Item Thermal and electrical model of fuel cell in connected to grid/isolated mode(2012) Nayak, S.K.; Gaonkar, D.N.The fuel cell based distributed generation (DG) system are gaining more attention due to stationary operation, reliable power and less maintenance. Among the different types of fuel cell, one of the high temperatures operating promising Solid Oxide Fuel Cell (SOFC) is preferred due to reliable operation and co-generation purpose. This paper presents the thermal and electrical model of SOFC in connected to the grid and isolated model of operation through power electronics interfacing circuit. The developed model SOFC includes the mathematical expression for thermal and electrical parameter variation inside the fuel cell. The developed model for this study is implemented using Matlab/Simulink environment and the simulation results reported in this paper validated the load following performance of SOFC based DG system. © 2012 IEEE.Item Modeling and performance analysis of microturbine generation system in grid connected/islanding mode(2012) Nayak, S.K.; Gaonkar, D.N.The microturbine based distributed generation (DG) system are predicted to play an important role in the distribution network in the near future. The microturbine generation (MTG) system has great impact on the DG system on real time system management and planning. It is popularly accepted that, MTG system are attracting the more attentions towards customers needs in a power generation market. Thus, to investigate the performance of MTG system and their efficient modeling are needed. This paper presents a dynamic modeling and performance analysis of MTG system in grid connected and islanding mode of operation. The model presented in this paper allows the power flow between grid and MTG system. The model of MTG system is built using mathematical expression in Matlab/Simulink environment. The simulation result shows the performance of MTG system for grid connected and islanding operation. © 2012 IEEE.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 Performance of microturbine generation system in grid perturbation condition(2013) Nayak, S.K.; Gaonkar, D.N.The distributed generation (DG) with microturbine generation (MTG) system is an emerging approach for providing a quality power in the distribution network. Thus, interconnection of MTG system into the distribution network has to withstand several grid issues, such as, balanced voltage dip, unbalanced voltage, voltage swell and many more. This paper presents the performance of MTG system in utility interconnected mode along with consideration of grid perturbation. The developed model of MTG system includes a microturbine as a prime mover, permanent magnet synchronous generator (PMSG) and power electronics interfacing circuit for grid interface. The performance of MTG system is analyzed in grid connected mode along with grid disturbances developed in Matlab/Simulink environment. The programmable voltage source is used to inject the grid disturbance. © 2013 IEEE.Item Fuel cell based hybrid distributed generation systems, 'a review'(2013) Nayak, S.K.; Gaonkar, D.N.Fuel cell is most promising power source for hybrid operation with conventional and non-conventional energy source. This is due to its operating temperature, power matching and remote application. The fuel cell based distributed generator (DG) source can be operated in combined with wind turbine, photovoitaic's generation system, gas turbine and many more. The hybrid operation of fuel cell with conventional DG source may increase the reliability, power quality and system stability. This paper presents the hybrid operation of fuel cell with other conventional DG system in utility interconnected mode. In this, it is addressed that, the fuel cell and its hybrid operation with other power generation application are given. The solid oxide fuel cell (SOFC) and microturbine based DG system are more preferred for the efficiency, reliability and performance related issues. © 2013 IEEE.Item Power management of hybrid fuel cell and microturbine based DG system in utility connected mode(Institute of Electrical and Electronics Engineers Inc., 2014) Nayak, S.K.; Gaonkar, D.N.The distributed generation (DG) with fuel cell and microturbine generation (MTG) system is an emerging approach to provide a quality power in the distribution network though the renewable and nonrenewable energy resources. Thus, interconnection of fuel cell MTG based DG system to the distribution network has to withstand several grid issues. This paper presents the hybrid operation of fuel cell and MTG based DG system in utility interconnected mode. The hybrid DG system includes a solid oxide fuel cell (SOFC) and MTG system with DC link based air and fuel flow control strategy to limit their output power. The hybrid SOFC and MTG system are integrated at common at common DC link and is delivered to grid through the power electronics interfacing. The model of hybrid DG system with SOFC and MTG system is presented using Matlab/Simulink environment and it performance has been studied through the simulation. © 2014 IEEE.