IET Chennai Fourth International Conference on Sustainable Energy and Intelligent Systems (SEISCON 2013)
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- Location: Chennai, India
- Conference date: 12-14 Dec. 2013
- ISBN: 978-1-78561-030-1
- Conference number: 2013/008
1 - 20 of 85 items found
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A new improved cultural algorithm approach for multiobjective reactive power planning problem
- Author(s): B. Bhattacharya ; K.K. Mandal ; N. Chakraborty ; L. Ramesh ; M.M. Beno
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Cultural algorithm is a well suited optimization technique for several multiobjective optimization problems. In this paper this cultural approach is used to solve reactive power planning problem considering the real power losses and the deviation of a given voltage schedule combining as a multi-objective model. Var control method is the key of optimal reactive power flow problem. In this paper the proposed method expands the cultural algorithm with a crossover operation to handle the non-linear optimization. Optimization of RPP problem is done with continuous and discrete control variables such as generator bus voltages, setting of on-load tap changer of transformers and the reactive power output of the compensating devices placed on different bus bars. The proposed algorithm is applied on IEEE 14 bus test systems to demonstrate its effectiveness. The results obtained by the proposed technique are compared with other population based heuristic techniques.
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Optimal sizing of pv power plant using sizing ratio for powering critical load with parallel redundant architecture
- Author(s): V. Raviprasad and R.K. Singh
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This paper proposes a method to determine optimal size of PV array for standalone PV system feeding critical load with parallel redundant power architecture, at a desired loss of power probability (LOPP) using PV-to-Inverter sizing ratio, and studies the effect of starting current on sizing and performance of PV power plant. Meteorological data and load details are used for calculating the relative size of photovoltaic (PV) array in a bottom up approach for different PV/inverter sizing ratios from 0.5 to 1.5 while keeping inverter rated capacity constant. The analysis shows that the starting load current capability of inverter has significant effect on PV-to-Inverter sizing ratio and Performance Ratio (PR) of the system.
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Optimal utilization of pv power by controlling ti-sepic converter
- Author(s): T. ChandraSekar ; A. Kannan ; V. Kumar ; B.J. Rabi
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The controller design of a TI-SEPIC converter for optimal utilization photovoltaic power is presented in this paper and qualitatively analyzed. A combination of conventional buck and Single-ended, primary-inductor converters (SEPIC) sharing common components are essential in this converter. Only one inductor is sufficient for performing the power conversion in both Buck and SEPIC converters in the load side integration. Due to the lower SEPIC converter is to extract maximum power from the PV and feeds into the load, while the remaining load power demand is supplied by the DC source through a voltage-mode controlled buck converter. Proposed integrated derivative converter performance is verified through MATLAB and compared with a Proposed Integrated converter.
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Anti islanding technique for grid connected residential solar inverter system
- Author(s): A. Ahmad and L. Rajaji
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Photovoltaic (PV) systems or solar inverters are now-a-days a part of inevitable power generation systems across the globe and they satisfy the energy demand and solve the power crisis in energy market. Many researchers are focusing on the design of power converters used in PV system, control strategies and PV panel designs in order to improve the efficiency of grid connected PV inverters. However, very limited literatures only focused into protection of solar inverters at the grid side. This paper describes the technique to protect the solar inverter during islanding situations or power disconnect of solar inverter from the grid. Power systems shall be applied anti islanding techniques in order to avoid the power delivery from the inverter during utility grid power failures so that unwanted short circuits and fire hazards would be avoided. An anti-islanding algorithm with designed flowchart and simulation results are presented in this paper to validate the proposed methodology.
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Performance evaluation of bridgeless and phase shifted semi bridgeless interleaved boost converters (IBCS) for power factor correction
- Author(s): V. Nithin ; P. Siva Priya ; R. Seyezhai ; K. Vigneshwar ; N. Siva Sumanth
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Hybrid Electric Vehicles (HEVs) require a constant DC supply which usually needs power conditioning involving non-linear devices. The use of non-linear devices induces harmonics and distortion in the supply current. Therefore there arises a need for power factor correction in the AC-DC converter of the charging system of HEVs. There are several topologies for power factor correction, among them the Bridgeless Interleaved and Phase Shifted Semi Bridgeless Interleaved topologies are highly efficient and yield a power factor closer to unity. This paper focuses on Bridgeless and Phase Shifted Semi-Bridgeless Interleaved Boost Converter topologies as solutions to the problem. The topologies are simulated using MATLAB and performance parameters like Total Harmonic Distortion (THD) in the line current, input power factor, purity factor, displacement factor, device losses, total loss and efficiency for both the topologies are evaluated and compared. On comparison this paper insists that the Phase Shifted Semi-Bridgeless Interleaved Boost topology is the best suited topology for use in HEVs under varying loads.
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Power Distribution System Effective Rtu Location In Impact With Differential Evolution Algorithm
- Author(s): L. Ramesh and N. Chakraborthy
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Real-time state estimates (SEs) of nodal demands in a power distribution system (PDS) can be developed using data from a supervisory control and data acquisition (SCADA) system. These estimates provide information for improved operations and customer service in terms of energy consumption and power quality. The SE results in a PDS are significantly affected by measurement characteristics, i.e., meter types, numbers, and topological distributions. The number and type of meters are generally selected prior to a SCADA layout. Thus, selecting measurement locations is critical. The aim of this study is to develop a methodology that optimally locates field measurement sites and leads to more reliable SEs and to estimate the state of the system. An optimal meter placement (OMP) problem is posed as a multi-objective optimization form and intelligent estimator is designed to estimate the bus voltage. The algorithm developed in DE used to identify the location of RTU and power flow meter. The intelligent algorithm developed with PSO and ANN to estimate the bus voltage with limited measurements. The algorithms are tested with TNEB and IEEE benchmark systems.
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Design and analysis of three port bidirectional converter interfacing solar photovoltaic system
- Author(s): M. Venmathi and R. Ramaprabha
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The aim of this paper is to interface photovoltaic (PV) system with the three port converter and to analyze the output of the three port bi-directional DC-DC converter. As one of the three ports of the interfaced converter is bi-directional port, the power balance of the system is achieved under different irradiation level. The system has also been analyzed with temperature variations. The detailed modeling and simulation of the photovoltaic system to interface the three port bi-directional converter using MatLab is carried out in this work. Maximum power point tracker (MPPT) is used in port 1 (PV port) so that maximum energy produced from PV is extracted all time.
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Modeling and comparison of six switch and three switch single phase to three phase matrix converters
- Author(s): S. Ranganathan ; S.R. Reddy ; V. Jamuna
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The Matrix Converter (MC) chosen in this work is capable of providing a variable three phase output voltage from a fixed single phase input using single stage phase conversion principle. This MC effectively provides three phase power to three phase variable speed drives. The implementation of MC requires solid state bidirectional switches. A new pulse generation scheme is developed to produce three phase voltage at the output. The performance of the Matrix converter is evaluated using MATLAB/SIMULINK for different frequencies. Simulation results for three phase resistive and inductive loads are presented. The simulation results validate the developed conversion strategy.
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Simulation based investigation of harmonics in line and neutral currents of 3-phase utility feeding 2-pulse rectifiers
- Author(s): A.N. Arvindan and P. Praveenkumar
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In the commercial sector single-phase, non-linear loads are predominant and their numbers are on the increase. The two-pulse diode bridge rectifier is the most popular single-phase topology deployed for ac-dc conversion of electrical energy; however, when feeding an inductive load, its line current has a total harmonic distortion of around 28%, that is a gross violation of contemporary power quality standards. Another concern is the presence of triplen harmonics including the third, in the line current, that add up in the neutral conductor. This paper reports distortion reduction by elimination of triplen harmonics and mitigation of non-triplen harmonics in the line and neutral currents using a delta-wye transformer between the three-phase utility and the diode bridge rectifiers. The efficacy of the technique is proved by MATLAB simulations based data and results.
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A novel methodology to enhance transient stability using SVC with fuzzy logic control
- Author(s): C.U. Shankar ; R. Thottungal ; M. Yuvaraj
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The existing power transmission capabilities can be flexibly controlled and enhanced with the help of new technology called Flexible AC Transmission System (FACTS). This power electronics based technology can be used individually or in co-ordination with other controllers. Static VAR Compensator (SVC) is a shunt connected FACTS device, used for voltage control and for reactive power compensation. In the existing system, the SVC uses a PI controller, which though simpler and cheaper, not suitable for non-linear characteristics. In order to overcome this, the controller is designed as a combination of both PI controller and Fuzzy Logic Controller, thereby gaining the joint advantages of both types. The designed model has been tested in a 2 machine 3 bus test system using MATLAB software. The simulation results show that the new controller logic gives better and quick performance compared to the other types.
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Adaptive backstepping controller for a vehicle active suspension system
- Author(s): R. Kalaivani and P. Lakshmi
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This paper deals with the comparative study of the performance of an adaptive Back Stepping Controller (BSC), an intelligent Fuzzy Logic Controller (FLC) and a conventional Proportional Integral and Derivative Controller (PIDC) based Vehicle Active Suspension System (VASS). BSC with a linear filter design rejects the high frequency road disturbances and improves the trade-off between the ride comfort and suspension travel. FLC design does not require mathematical model of the system to be controlled. The effectiveness of BSC and FLC is compared with as that of the PID controller. With the Root Mean Square (RMS) value of body acceleration as the performance index, the simulation is carried out using MATLAB/SIMULINK software. Simulation results show that the BSC based VASS is effective in vibration isolation of the vehicle body compared to passive system, PIDC and FLC based VASS.
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Modeling and simulation of standalone micro hydro - diesel hybrid power plant for Indian hilly region
- Author(s): G. Konar ; A.K. Singh ; N. Chakraborty
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Several renewable energy sources are being used these days either individually or in a hybrid manner for fulfilling different demand scenario. This paper emphasizes on modeling and simulation of Micro Hydro-Diesel hybrid power generation system for isolated operation in a hilly region as this type of studies are not very frequently available in literature. A diesel generator serves as a backup power source for mitigating non availability of generation from the micro hydro source during dry seasons. The models of micro-hydro plant and diesel generator drawn in MATLAB/Simulink are connected in parallel to form a standalone hybrid power generation model. The performance of this hybrid power system is observed with the variation of load. The speed governing control system employed for both the generating units ensures the constant speed operation during variation of load. The sharing of the active power load by both the generator is also observed here. The transient behaviour of voltage, current and the rotor speed of the generators are also captured. Simulation results show that the steady state condition is restored within few seconds of load change. This ensures the stability of the entire system.
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Enhancement of travelling comfort using PID based adaptive neuro fuzzy inference system for half car model
- Author(s): R. Kalaivani ; P. Lakshmi ; K.K. Sneha
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In this paper, pioneering Adaptive Neuro Fuzzy Inference System (ANFIS) which is trained with well known traditional Proportional, Integral and Derivative (PID) controller data for Half Car (HC) model is proposed to improve the travelling comfort. The travelling performance is generally assessed at the design stage in automobile industries by simulating the vehicle response to various road excitations. In this work, the disturbance from the road is assumed to be a jerk which represents a sudden shock. Initially a PID controller is designed and tuned to give better response. Secondly the PID tuning parameters are optimized using popular stochastic global optimization technique - Genetic Algorithm (GA) by considering the body acceleration as the Performance Index (PI). At last, an ANFIS which inherits the features of Neural Network (NN) and Fuzzy Logic (FL) is used for control purpose. The modelling of system and simulation with and without controllers are carried out in MATLAB/ Simulink environment. A comparison is made among the responses obtained and it shows that, the system with PID based ANFIS gives significant reduction of the Sprung mass Displacement (SD) and thus improves the travelling comfort.
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Experimental investigation of harmonics in line and neutral currents of 3-phase utility feeding 2-pulse rectifiers
- Author(s): A.N. Arvindan and P. Praveenkumar
- + Show details - Hide details
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p.
(7)
In the commercial sector single-phase, non-linear loads are predominant and their numbers are on the increase. The two-pulse diode bridge rectifier is the most popular single-phase topology deployed for ac-dc conversion of electrical energy; however, when feeding an inductive load, its line current has a total harmonic distortion of around 28%, that is a gross violation of contemporary power quality standards. Another concern is the presence of triplen harmonics including the third, in the line current, that add up in the neutral conductor. This paper reports distortion reduction by elimination of triplen harmonics and mitigation of non-triplen harmonics in the line and neutral currents using a delta-wye transformer between the three-phase utility and the diode bridge rectifiers. The efficacy of the technique is proved by experimental data and power quality measurements.
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Implementation and control of extra high voltage DC-DC boost converter
- Author(s): S. Padmanaban ; A. Iqbal ; H. Abu-Rub
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This research paper article work focussed on the development of an extra high gain boost dc-dc converter for high voltage dc application with simple closed loop control scheme is presented. Classical version of step-up voltage dc-dc conversion configurations are used in high power (voltage/current) applications, but they are limited due to the restricted voltage transfer gain ratio, less efficiency, and moreover require two sensors with complex control algorithm lead to non-economical utilization. Further, the effect of parasitic elements limits both output voltage and power transfer efficiency of dc-dc converters. But with the application of voltage lift techniques pay the way to overcome these limitation, opening reliable way to improve the performance characteristics. Complete model of the proposed high gain dc-dc converter along with simplified closed controller was implemented in numerical simulation software using Matlab/Simulink environment and hardware prototype was realized using DSPTMS320F2812 with resistive loads. The performances are investigated under both line and load perturbation conditions. Numerical simulation results along experimental verifications are provided with complete theoretical developments.
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Impact of decreasing number of bidders on power bidding in deregulated environment
- Author(s): D. Palit and N. Chakraborty
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Optimum power bidding in deregulation is quite important not only for business profitability but also from energy sustainability. Particularly this becomes interesting when any one bidder is withdrawing participation amongst several contesting bidders. In this work effect of withdrawal of one bidder among three participating bidders are analyzed. Here each bidder has one thermal generating unit & they are offering different bidding prices for gaining maximum profit. Different category of bidding situations are considered when three bidders are withdrawing power bidding one by one. Different bidding profile combinations along with some technical constraints like power balance constraints, power generation limit & fuel cost constraints are considered here. Economic power scheduling has been done using Newton-Raphson method for standard IEEE 9 bus test system. Impact of decreasing number of bidder on rest of the participating bidder's profits, market price have been analysed in each case. For the power bidding problem, theory of dominance approach of Game theory has been applied & searching of the Nash equilibrium has been accomplished. It is observed that the participating bidders are gaining more profit except in “sub-marginal bidding” when one particular bidder has made it's exit. But power selling price has increased in all cases.
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Power management of multi-tier virtualized web services
- Author(s): G. Prabhakaran and K. Komathy
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Virtualized web server's performance and power are vital challenges at the present time. A solitary machine consists of many virtualized web servers. The cluster of web servers pooled to form different tier is consigned as multi-tier web servers. The performance of the weighty work loaded virtualized tier may plunge below the permissible limit and also the power consumption will increase. Performance of all virtual machines has to be uplifted simultaneously using intellectual power saving mechanisms. The reprehensible maintenance of the performance and power of one virtual machine may impinge on the others to breach their performance specifications. Here, we propose a power reduction technique using dynamic controller and dynamic modulator to clasp multi-tier web services by modelling the correlations between the virtual machines that run different tiers. Results showing the correlation between virtual machines that run at different tiers give enhanced level in power reduction where virtualized web servers are successively exploited.
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Economic feasibility studies on wind-biomass-solar based microgid power system through a modified differential evolution technique
- Author(s): T. Som and N. Chakraborty
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An economic evaluation of a network of distributed energy resources (DERs) forming an autonomous power delivery system in an Indian scenario has been made. The mathematical analysis is based on the application of a modified differential evolution (MDE) algorithm. The total annual costs for the power delivery networks involving different types of consumers, organized into a microgrid and sharing power from a combination of DERs, battery have been evaluated. The DERs studied in this work are solar module (SPS), wind-turbine (WT) and biomass gassifier units (BMGU). To meet the consumption, the DERs are supported by a battery electrical storage system (BESS) and the provision to purchase/sale of power from/ to an utility connected to the microgrid. Two different sets of hybrid DERs namely WT-BMGU and SPS-BMGU are compared for the economic performance through the evaluation of the corresponding optimal power operation conditions. The results using a combination of SPS and BMGU as DERs are found to be more cost competitive. A reduction of 5.6 % in the annual cost is obtained using solar photovoltaic and biomass gassifier unit to that using wind-turbine and biomass gassifier unit for the same load demand in case of microgrid operation.
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UPFC placement: a new self adaptive firefly algorithm
- Author(s): R. Selvarasu and M.S. Kalavathi
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In this paper a new strategy has been proposed for optimal placement of Unified Power Flow Controller (UPFC) in power systems with a view to minimize the transmission loss. The proposed strategy uses Self Adaptive Firefly Algorithm (SAFA) and identifies the optimal locations for UPFC placement and their parameter. The UPFC placement strategy is applied on IEEE14 bus system and IEEE 30 bus system. The test results are presented which shows that location and parameters of the UPFC identified by the proposed method has been able to minimize the transmission loss.
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Negative sequence and harmonic mitigation of grid connected AC railway traction using PI and fuzzy controllers
- Author(s): V.P. Joseph and J. Thomas
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Railway traction has become an important part of power system. It creates power quality issues in the grid. Negative sequence and harmonic currents have become the main issues in high speed train traction systems. Railway static power conditioner (RPC) has been developed to mitigate the power quality issues. A comprehensive technique for compensation of negative sequence and harmonic currents has been discussed. RPC is a back to back connected converter with a dc link. The controller also provides a constant dc link voltage and thus helps in the compensation of power quality problem. In this paper PI and FUZZY controllers are discussed and compared for their performance. These controllers are introduced for the current tracking control of RPC, thus the PQ issues are mitigated. Thus RPC improves the power quality in railway traction.
