Conference Papers
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Item Fuzzy logic based coordinated voltage regulation method for distribution system with multiple synchronous generators(2010) Gaonkar, D.N.; Pillai, G.N.The continued interest in the distributed generation (DG) sources in recent years is leading to the growth of a number of generators connected to distribution networks. The steady-state voltage rise resulting from the connection of these generators can be a major obstacle at the lower voltage levels. Present network design practice is to limit the generator capacity to a level at which the upper voltage limit is not exceeded. This reduces the efficiency of DG system. This paper proposes a coordinated voltage control scheme using fuzzy logic based power factor controller, for distribution network with multiple Distributed generation systems. In the proposed scheme individual generators participate in voltage regulation of the distribution system, based on their participation factor determined using sensitivity analysis. The simulation results presented in the paper show the effectiveness of the method. © 2010 IEEE.Item Fuzzy logic based coordinated voltage regulation method for distribution system with multiple synchronous generators(2010) Gaonkar, D.N.; Pillai, G.N.The continued interest in the distributed generation (DG) sources in recent years is leading to the growth of a number of generators connected to distribution network. One of the major concern due to connection of these generators is the rise in steady state voltage level of distribution system. Present network design practice is to limit the generator capacity to a level at which the upper voltage limit is not exceeded. This reduces the efficiency of DG system. This paper proposes a coordinated voltage control scheme using fuzzy logic based power factor controller, for distribution network with multiple synchronous generators. In the proposed scheme individual generators participate in voltage regulation of the distribution system, based on their participation factor determined using sensitivity analysis. The simulation results presented in the paper show the effectiveness of the method. © 2010 IEEE.Item Modeling and performance analysis of microturbine based Distributed Generation system, "a review"(2011) Gaonkar, D.N.; Nayak, S.Distributed Generation (DG) is predicted to play an important role in the electric power system in the near future. It is widely accepted that microturbine-generation systems are currently attracting lot of attention to meet users' need in the distributed generation market. In order to gain the benefits of interconnected operation of microturbine generation system (MTG) system with the utility network, their effective modeling and performance analysis are required. This paper presents the recent research efforts in accurate modeling of MTG System and the investigation on various issues related to their interconnected operation and control with the distribution network. © 2011 IEEE.Item Performance study of isolated hybrid power system with multiple generation and energy storage units(2011) Sabhahit, N.S.; Gaonkar, D.N.This paper presents proportional-plus-integral (PI) controller based frequency regulation of isolated autonomous hybrid distributed generation system for sudden variation in load demand and wind. The developed hybrid system comprises of wind turbine generator (WTG), micro-turbine generator (MTG), fuel cell (FC), an aqua electrolyzer (AE) along with the energy storage device such as battery energy storage system (BESS). Further ultracapacitor (UC) as an alternative energy storage element is incorporated into the system for better performance. The generated hydrogen by an aqua electrolyzer is used as fuel for a fuel cell. The simulation results reported in the paper focused on frequency response for variable wind power, step load change and variable load. © 2011 IEEE.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 Dynamic modeling and analysis of an isolated self excited induction generator driven by a wind turbine(2012) Sabhahit, N.S.; Gaonkar, D.N.This paper presents modeling, simulation and transient analysis of three phase self-excited induction generator (SEIG) driven by a wind turbine. Three phase self-excited induction generator is driven by a variable-speed prime mover such as a wind turbine for the clean alternative renewable energy in rural areas. Transients of machine self-excitation under three phase balanced load conditions are simulated using a Matlab/Simulink block diagram for constant, step change in wind speed and random variation in wind speed. © 2012 IEEE.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.