The document describes a proposed design for a PWM buck-boost converter to drive LEDs for underground coal mine lighting. Simulation results are presented for arrays of 5 and 8 LEDs with and without closed-loop control. With control, the output voltage is maintained at 12V despite input voltage and load variations, improving stability for constant LED illumination over long periods. Tables show voltage, current, efficiency and ripple values obtained from MATLAB and PSIM simulations, demonstrating the converter meets requirements for stable LED operation.
This document summarizes research on using a buck-boost converter with perturb and observe (P&O) maximum power point tracking (MPPT) techniques to optimize the performance of a photovoltaic (PV) system. It first provides background on the need for solar energy and MPPT. It then describes using a buck-boost converter to match the source and load impedances in order to improve efficiency. The document outlines the P&O MPPT algorithm and its implementation using a microcontroller to control the buck-boost converter duty cycle and continuously adjust it to track the maximum power point of the PV module. Simulation results showing the output voltage and ripple voltage of the buck-boost converter operating in buck and boost modes are
The document discusses the design of a high voltage step-up DC-DC converter using coupled inductor and switched capacitor techniques. It aims to achieve a high step-up voltage gain by charging capacitors in parallel and discharging them in series through a coupled inductor. This allows an input voltage of 24 volts to output 400 volts at an appropriate duty ratio. The converter design is analyzed and its simulation results in a 400 volt output voltage without ripples are presented. A plan of action with timeline is also provided to fabricate and test the converter.
This document presents a design for a DC-DC boost converter for use in a solar electric system. It includes a block diagram of the system components, an explanation of how a basic boost converter works to output a voltage higher than the input voltage, and descriptions of switching devices, integrated circuits, advantages, disadvantages, and applications of boost converters. The presentation was created by three students as part of a class project on solar energy systems.
“MODELING AND ANALYSIS OF DC-DC CONVERTER FOR RENEWABLE ENERGY SYSTEM” Final...8381801685
This project portrays a comparative analysis of DC-DC Converters for Renewable Energy System. The electrolysis method which increases the hydrogen production and storage rate from wind-PV systems. It has been proved that DC-DC converter with transformer has the desirable features for electrolyser application. The converter operates in lagging PF mode for a very wide change in load and supply voltage variations, thus ensuring ZVS for all the primary switches. The peak current through the switches decreases with load current.This paper portrays a comparative analysis of DC-DC Converters for Renewable Energy System . The simulation and experimental results show that the power gain obtained by this method clearly increases the hydrogen production and storage rate from wind-PV systems. It has been proved that DC-DC converter with transformer has the desirable features for electrolyser application. Theoretical predictions of the selected configuration have been compared with the MATLAB simulation results. The simulation and experimental results indicate that the output of the inverter is nearly sinusoidal. The output of rectifier is pure DC due to the presence of LC filter at the output. It can be seen that the efficiency of DC-DC converter with transformer is 15% higher than the converter without transformer.
power generation through solar power for PV module applicationsSai Kumar
This document describes a high boost ratio hybrid transformer DC-DC converter for photovoltaic module applications. The converter aims to increase efficiency by reducing switching losses and current ripple while allowing for maximum power point tracking. It achieves an output efficiency over 96% by utilizing a hybrid transformer to simultaneously transfer inductive and capacitive energy. The converter was simulated and results showed the output voltage reaching over 500V with low ripple at the input of 40V, demonstrating its high boost ratio capability.
This document summarizes a student's major assignment on designing a controller for a buck-boost converter circuit. The student developed mathematical models to describe the circuit and analyze power losses. Based on this, the student designed a controller using a combined feedback and feedforward approach to minimize losses while maintaining output voltage and rejecting disturbances. Simulation results showed the controller could successfully drive the circuit in both buck and boost modes and regulate the output voltage even for non-linearized steady states.
The document discusses a proposed DC-DC converter for integrating the charging and discharging circuits of a solar LED street lighting system into a single converter. In charging mode during the day, the converter uses pulse-width modulation to step down the voltage from the solar panel to charge the battery. In discharging mode at night, it steps up the battery voltage to power the LED street lights. Simulation results show the converter can successfully charge the battery during the day and power the lights at night with only one integrated converter rather than two separate converters.
This technical seminar discusses maximum power point tracking using a buck converter for solar photovoltaic systems. It describes the characteristics of solar cells and modules, and how maximum power point tracking algorithms and switch mode DC-DC buck converters can be used to extract the maximum available power from the solar panels under varying operating conditions. Simulation and experimental results are presented comparing the performance of two buck converter topologies - the basic buck converter with input filter and a fourth-order buck converter - for maximum power point tracking applications.
This document summarizes research on using a buck-boost converter with perturb and observe (P&O) maximum power point tracking (MPPT) techniques to optimize the performance of a photovoltaic (PV) system. It first provides background on the need for solar energy and MPPT. It then describes using a buck-boost converter to match the source and load impedances in order to improve efficiency. The document outlines the P&O MPPT algorithm and its implementation using a microcontroller to control the buck-boost converter duty cycle and continuously adjust it to track the maximum power point of the PV module. Simulation results showing the output voltage and ripple voltage of the buck-boost converter operating in buck and boost modes are
The document discusses the design of a high voltage step-up DC-DC converter using coupled inductor and switched capacitor techniques. It aims to achieve a high step-up voltage gain by charging capacitors in parallel and discharging them in series through a coupled inductor. This allows an input voltage of 24 volts to output 400 volts at an appropriate duty ratio. The converter design is analyzed and its simulation results in a 400 volt output voltage without ripples are presented. A plan of action with timeline is also provided to fabricate and test the converter.
This document presents a design for a DC-DC boost converter for use in a solar electric system. It includes a block diagram of the system components, an explanation of how a basic boost converter works to output a voltage higher than the input voltage, and descriptions of switching devices, integrated circuits, advantages, disadvantages, and applications of boost converters. The presentation was created by three students as part of a class project on solar energy systems.
“MODELING AND ANALYSIS OF DC-DC CONVERTER FOR RENEWABLE ENERGY SYSTEM” Final...8381801685
This project portrays a comparative analysis of DC-DC Converters for Renewable Energy System. The electrolysis method which increases the hydrogen production and storage rate from wind-PV systems. It has been proved that DC-DC converter with transformer has the desirable features for electrolyser application. The converter operates in lagging PF mode for a very wide change in load and supply voltage variations, thus ensuring ZVS for all the primary switches. The peak current through the switches decreases with load current.This paper portrays a comparative analysis of DC-DC Converters for Renewable Energy System . The simulation and experimental results show that the power gain obtained by this method clearly increases the hydrogen production and storage rate from wind-PV systems. It has been proved that DC-DC converter with transformer has the desirable features for electrolyser application. Theoretical predictions of the selected configuration have been compared with the MATLAB simulation results. The simulation and experimental results indicate that the output of the inverter is nearly sinusoidal. The output of rectifier is pure DC due to the presence of LC filter at the output. It can be seen that the efficiency of DC-DC converter with transformer is 15% higher than the converter without transformer.
power generation through solar power for PV module applicationsSai Kumar
This document describes a high boost ratio hybrid transformer DC-DC converter for photovoltaic module applications. The converter aims to increase efficiency by reducing switching losses and current ripple while allowing for maximum power point tracking. It achieves an output efficiency over 96% by utilizing a hybrid transformer to simultaneously transfer inductive and capacitive energy. The converter was simulated and results showed the output voltage reaching over 500V with low ripple at the input of 40V, demonstrating its high boost ratio capability.
This document summarizes a student's major assignment on designing a controller for a buck-boost converter circuit. The student developed mathematical models to describe the circuit and analyze power losses. Based on this, the student designed a controller using a combined feedback and feedforward approach to minimize losses while maintaining output voltage and rejecting disturbances. Simulation results showed the controller could successfully drive the circuit in both buck and boost modes and regulate the output voltage even for non-linearized steady states.
The document discusses a proposed DC-DC converter for integrating the charging and discharging circuits of a solar LED street lighting system into a single converter. In charging mode during the day, the converter uses pulse-width modulation to step down the voltage from the solar panel to charge the battery. In discharging mode at night, it steps up the battery voltage to power the LED street lights. Simulation results show the converter can successfully charge the battery during the day and power the lights at night with only one integrated converter rather than two separate converters.
This technical seminar discusses maximum power point tracking using a buck converter for solar photovoltaic systems. It describes the characteristics of solar cells and modules, and how maximum power point tracking algorithms and switch mode DC-DC buck converters can be used to extract the maximum available power from the solar panels under varying operating conditions. Simulation and experimental results are presented comparing the performance of two buck converter topologies - the basic buck converter with input filter and a fourth-order buck converter - for maximum power point tracking applications.
A Novel High Step-Up Dc-Dc Converter for a Microgrid SystemSudharshan Reddy
This document describes a novel high step-up DC-DC converter for microgrid systems. It consists of two capacitors, two diodes, and a coupled inductor. The capacitors charge in parallel and discharge in series via the coupled inductor to achieve high voltage gain. It operates in both continuous and discontinuous conduction modes with different switching modes. Experimental results show it can achieve a voltage gain of 5 times and efficiency of 96.8%. The converter is well-suited for microgrid applications requiring high step-up voltage conversion with high efficiency.
CHANGING OF BATTERY FROM SOLAR SUPPLY USING BOOST CONVERTERshiv kapil
The document describes a student project to charge batteries from a solar supply using a buck-boost converter and MPPT. It provides background on buck-boost converters and MPPT, discusses the aims and objectives of using these techniques, and presents the simulation results of a buck-boost converter in Matlab. The project is aimed at safely charging batteries with a fluctuating solar input voltage.
This document presents a schematic block diagram of a photovoltaic system with an interleaved boost converter and maximum power point tracking using the perturbation and observation method. It includes a single diode model of a PV cell and discusses the charging and discharging modes of operation of the boost converter. Simulation waveforms are presented showing the improvement with MPPT control. Future work will involve designing a closed loop inverter for grid synchronization.
Physical design and modeling of 25 v dc dc boost converter for stand alone so...ecij
As per the present development the shortage in powe
r all over the world seems to be abundance.
Renewable energy sources are the capable energy sou
rce along with the accessible resources of energy.
Among all the renewable resources of energy, solar
PV technology is most acceptable due to its
considerable advantage over other form of renewable
sources. Calculating the output of PV system is a
key
aspect. The main principle of this paper is to pres
ent physical modeling and simulation of solar PV sy
stem
and DC-DC boost converter in SIMSCAPE library of MA
TLAB. The benefit by SIMSCAPE library is that it
models the system physically and the outcome obtain
s from it will be considering all the physical resu
lt. In
this paper the output of solar cell has been interf
aced with the boost converter. The system model in
SIMSCAPE can be directly converted into hardware fo
r implement for actual time application
A high efficiency non isolated buck-boost converter based on zeta converterAsoka Technologies
This document discusses a new transformerless buck-boost converter based on a ZETA converter that has advantages over existing converters. The proposed converter uses only one main switch, which decreases losses and improves efficiency. It provides a higher voltage gain than other converters while maintaining a low voltage stress on the active switch. Mathematical analyses and experimental results are provided to validate the performance of the proposed converter, which is well-suited for applications such as fuel cells, electric vehicles, and LED drivers.
Iaetsd an interleaved boost converter integrating withIaetsd Iaetsd
This document describes a new type of high step-up converter that is suitable for renewable energy sources like solar cells. The proposed converter integrates a voltage multiplier module composed of switched capacitors and coupled inductors with a conventional interleaved boost converter. This allows it to achieve a high step-up gain without needing a large duty cycle. The arrangement reduces current stress and ripple, improving efficiency and component lifetime. It also recycles leakage energy back to the output, reducing voltage spikes and further improving efficiency. Analysis shows the converter can achieve a voltage gain of 10 with a duty cycle of only 0.6, or a gain of 30 with a higher turn ratio. It allows the use of low-voltage switches to reduce losses and
Dc-Dc boost converter topologies and MPPT techniques for Grid connected PV sy...rameshwar meena
1. Modeling of Dc-Dc boost converter in MATLAB Simulink.
2. MATLAB Simulink of P&O techniques and Incremental conductance.
3. Ac grid connected to solar PV array via dc-dc boost converter and Dc-Ac converter.
Design high gain dc dc boost converter with coupling inductor and simulation ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document summarizes a research paper that proposes a dual-input single-stage inverter topology for standalone solar photovoltaic systems to provide electricity in rural areas without access to the electric grid. The proposed system uses a maximum power point tracking algorithm and boost converter to increase the low voltage from the solar panels. It then uses a single-stage boost inverter with sinusoidal pulse width modulation to efficiently convert the solar DC power to high-quality AC power for loads without additional filters or protections. Simulation and experimental results showed the system could boost input voltages and produce 230V AC output for rural electrification with reduced components compared to traditional two-stage inverter designs.
1) The document discusses using boost converters to increase the output of solar panels. It proposes using a microcontroller to obtain a duty cycle of up to 0.5 to improve efficacy with a ferrite-core inductor.
2) The proposed design uses a single pole double throw relay connected to a comparator to switch the load between the boost converter output and main supply if solar output is insufficient.
3) Applications discussed include use in hybrid electric vehicles to boost battery voltage and use in solar home lighting systems to boost solar cell output to a high enough voltage to power lamps.
here dc-dc boost converter designed in MATLAB Simulink and MPPT controller designed in 2 methods(P&O and incremental conductance).
finally, I connect it to Ac grid via the Dc-Ac converter.
this entire system called grid-connected PV system.
This document summarizes a research paper that proposes a closed loop control system for a four-quadrant DC drive fed by a dual AC-DC buck converter to improve power quality. The system uses symmetrical multipulse modulation and feedback control to regulate the output voltage supplied to the DC drive. Simulation results show that the closed loop system provides better dynamic response, stability, voltage profile, power factor and reduced harmonic distortion compared to an open loop system, especially under varying load conditions. The paper analyzes the system's performance in the four quadrants of operation.
The document discusses design and implementation of a soft switched high gain current fed full bridge DC-DC converter for fuel cell applications. It provides background on fuel cells and the need for a power electronics interface to convert unregulated electric power from alternative energy sources into usable power. The challenges include designing an efficient and low cost power converter with high efficiency during load operation, large step-up ratio, and low input ripple current. Various converter topologies are reviewed from literature including boost, interleaved boost, coupled inductor, flyback, and half/full-bridge converters. The proposed converter design and steady state analysis is presented along with theoretical waveforms and discussion of hardware implementation.
IRJET- Design and Implementation of Converters using MPPT in an Eco VehicleIRJET Journal
1) The document describes the design and implementation of converters using maximum power point tracking (MPPT) in a solar electric vehicle. A SEPIC converter is used to regulate the nonlinear output from the photovoltaic panels and MPPT with perturb and observe algorithm is used to track maximum power.
2) Fuzzy logic control is applied to control the SEPIC converter. The obtained voltage from the photovoltaic system is stored in a 48V battery. This improves the overall efficiency and performance of the solar electric vehicle.
3) The SEPIC converter regulates the fluctuating DC output from the solar panels into a stiff DC output. Fuzzy logic control provides pulse width modulated signals to the SEPIC converter to control
This paper presents a simulation of a DC/DC buck-boost converter for integrating a solar PV generation system into a DC nano-grid. The simulation models an MPPT algorithm to extract maximum power from the solar PV module and regulate the output voltage of the buck-boost converter at 12V and 24V using PI control. The proposed system directly feeds the maximum available DC power from the solar PV module to the DC nano-grid loads, improving efficiency by reducing conversion stages. The simulation results demonstrate the buck-boost converter maintaining a constant voltage on the DC bus regardless of variations in solar PV generation.
Design and Simulation of PV Based Two-Phase Interleaved Boost Converter IJMER
In this paper, simulation of PV based two phase interleaved boost converter has been
discussed. Interleaved Boost Converter (IBC) serves several applications which require boost in output
voltage such as fuel cells, photovoltaic cells and batteries etc., because it has several advantages over
conventional DC-DC converters. The configuration of IBC comprises parallel combination of a number
of boost converters with same phase shift and switching frequency. This paper deals with the design of
two-phase IBC for a five level cascaded multilevel inverter (MLI). The source for each bridge of the MLI
has been modelled as PV. The simulation has been carried out using MATLAB/SIMULINK
Power Factor Correction Methods
Fixed Capcitors
Synchronous Condensors
Phase Advancers
Switch Capacitors
Static Var Compensator(SVC)
Static Synchronous Compensator(STATCOM)
Modulated power filter capacitor compensator
Economics of power factor improvement
Economical comparison of increasing the power supply
Performance evaluation of Maximum Power Point Tracking algorithm with buck dc...IJERA Editor
The energy crisis concern leads to look for alternate source of energy. Solar energy is considered as most reliable
among the all renewable energy sources. Solar PV (Photovoltaic) is used to convert solar energy into electric
energy. The efficiency of solar PV is very low and its characteristic is nonlinear. To overcome these drawbacks a
technique known as maximum power point tracking is used. This algorithm is implemented in the control circuit
of DC – DC converter. The objective of this paper is to evaluate the MPPT (Maximum Power Point Tracking)
with buck DC-DC converter under load varying conditions. The simulation work is done using PSIM simulation
software.
The document discusses a buck-boost converter which can step up or step down a DC voltage. It operates by alternately connecting the inductor to the input voltage source and output load. When the switch is on, energy is stored in the inductor. When the switch is off, the inductor supplies power to the load while being charged by the capacitor. The duty ratio of the switch controls whether the output voltage is higher or lower than the input. Buck-boost converters have advantages like providing both positive and negative output voltages but require a capacitor with a large ripple current rating.
The document discusses the design and operation of a buck-boost DC-DC converter circuit. It provides details on component sizing, current and voltage ratings, and worst-case analyses. Key aspects covered include inductor and capacitor sizing to limit ripple current and voltage, MOSFET and diode voltage and current ratings, and concluding that 50kHz may be too low a switching frequency for this buck-boost converter design.
A Novel High Step-Up Dc-Dc Converter for a Microgrid SystemSudharshan Reddy
This document describes a novel high step-up DC-DC converter for microgrid systems. It consists of two capacitors, two diodes, and a coupled inductor. The capacitors charge in parallel and discharge in series via the coupled inductor to achieve high voltage gain. It operates in both continuous and discontinuous conduction modes with different switching modes. Experimental results show it can achieve a voltage gain of 5 times and efficiency of 96.8%. The converter is well-suited for microgrid applications requiring high step-up voltage conversion with high efficiency.
CHANGING OF BATTERY FROM SOLAR SUPPLY USING BOOST CONVERTERshiv kapil
The document describes a student project to charge batteries from a solar supply using a buck-boost converter and MPPT. It provides background on buck-boost converters and MPPT, discusses the aims and objectives of using these techniques, and presents the simulation results of a buck-boost converter in Matlab. The project is aimed at safely charging batteries with a fluctuating solar input voltage.
This document presents a schematic block diagram of a photovoltaic system with an interleaved boost converter and maximum power point tracking using the perturbation and observation method. It includes a single diode model of a PV cell and discusses the charging and discharging modes of operation of the boost converter. Simulation waveforms are presented showing the improvement with MPPT control. Future work will involve designing a closed loop inverter for grid synchronization.
Physical design and modeling of 25 v dc dc boost converter for stand alone so...ecij
As per the present development the shortage in powe
r all over the world seems to be abundance.
Renewable energy sources are the capable energy sou
rce along with the accessible resources of energy.
Among all the renewable resources of energy, solar
PV technology is most acceptable due to its
considerable advantage over other form of renewable
sources. Calculating the output of PV system is a
key
aspect. The main principle of this paper is to pres
ent physical modeling and simulation of solar PV sy
stem
and DC-DC boost converter in SIMSCAPE library of MA
TLAB. The benefit by SIMSCAPE library is that it
models the system physically and the outcome obtain
s from it will be considering all the physical resu
lt. In
this paper the output of solar cell has been interf
aced with the boost converter. The system model in
SIMSCAPE can be directly converted into hardware fo
r implement for actual time application
A high efficiency non isolated buck-boost converter based on zeta converterAsoka Technologies
This document discusses a new transformerless buck-boost converter based on a ZETA converter that has advantages over existing converters. The proposed converter uses only one main switch, which decreases losses and improves efficiency. It provides a higher voltage gain than other converters while maintaining a low voltage stress on the active switch. Mathematical analyses and experimental results are provided to validate the performance of the proposed converter, which is well-suited for applications such as fuel cells, electric vehicles, and LED drivers.
Iaetsd an interleaved boost converter integrating withIaetsd Iaetsd
This document describes a new type of high step-up converter that is suitable for renewable energy sources like solar cells. The proposed converter integrates a voltage multiplier module composed of switched capacitors and coupled inductors with a conventional interleaved boost converter. This allows it to achieve a high step-up gain without needing a large duty cycle. The arrangement reduces current stress and ripple, improving efficiency and component lifetime. It also recycles leakage energy back to the output, reducing voltage spikes and further improving efficiency. Analysis shows the converter can achieve a voltage gain of 10 with a duty cycle of only 0.6, or a gain of 30 with a higher turn ratio. It allows the use of low-voltage switches to reduce losses and
Dc-Dc boost converter topologies and MPPT techniques for Grid connected PV sy...rameshwar meena
1. Modeling of Dc-Dc boost converter in MATLAB Simulink.
2. MATLAB Simulink of P&O techniques and Incremental conductance.
3. Ac grid connected to solar PV array via dc-dc boost converter and Dc-Ac converter.
Design high gain dc dc boost converter with coupling inductor and simulation ...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
This document summarizes a research paper that proposes a dual-input single-stage inverter topology for standalone solar photovoltaic systems to provide electricity in rural areas without access to the electric grid. The proposed system uses a maximum power point tracking algorithm and boost converter to increase the low voltage from the solar panels. It then uses a single-stage boost inverter with sinusoidal pulse width modulation to efficiently convert the solar DC power to high-quality AC power for loads without additional filters or protections. Simulation and experimental results showed the system could boost input voltages and produce 230V AC output for rural electrification with reduced components compared to traditional two-stage inverter designs.
1) The document discusses using boost converters to increase the output of solar panels. It proposes using a microcontroller to obtain a duty cycle of up to 0.5 to improve efficacy with a ferrite-core inductor.
2) The proposed design uses a single pole double throw relay connected to a comparator to switch the load between the boost converter output and main supply if solar output is insufficient.
3) Applications discussed include use in hybrid electric vehicles to boost battery voltage and use in solar home lighting systems to boost solar cell output to a high enough voltage to power lamps.
here dc-dc boost converter designed in MATLAB Simulink and MPPT controller designed in 2 methods(P&O and incremental conductance).
finally, I connect it to Ac grid via the Dc-Ac converter.
this entire system called grid-connected PV system.
This document summarizes a research paper that proposes a closed loop control system for a four-quadrant DC drive fed by a dual AC-DC buck converter to improve power quality. The system uses symmetrical multipulse modulation and feedback control to regulate the output voltage supplied to the DC drive. Simulation results show that the closed loop system provides better dynamic response, stability, voltage profile, power factor and reduced harmonic distortion compared to an open loop system, especially under varying load conditions. The paper analyzes the system's performance in the four quadrants of operation.
The document discusses design and implementation of a soft switched high gain current fed full bridge DC-DC converter for fuel cell applications. It provides background on fuel cells and the need for a power electronics interface to convert unregulated electric power from alternative energy sources into usable power. The challenges include designing an efficient and low cost power converter with high efficiency during load operation, large step-up ratio, and low input ripple current. Various converter topologies are reviewed from literature including boost, interleaved boost, coupled inductor, flyback, and half/full-bridge converters. The proposed converter design and steady state analysis is presented along with theoretical waveforms and discussion of hardware implementation.
IRJET- Design and Implementation of Converters using MPPT in an Eco VehicleIRJET Journal
1) The document describes the design and implementation of converters using maximum power point tracking (MPPT) in a solar electric vehicle. A SEPIC converter is used to regulate the nonlinear output from the photovoltaic panels and MPPT with perturb and observe algorithm is used to track maximum power.
2) Fuzzy logic control is applied to control the SEPIC converter. The obtained voltage from the photovoltaic system is stored in a 48V battery. This improves the overall efficiency and performance of the solar electric vehicle.
3) The SEPIC converter regulates the fluctuating DC output from the solar panels into a stiff DC output. Fuzzy logic control provides pulse width modulated signals to the SEPIC converter to control
This paper presents a simulation of a DC/DC buck-boost converter for integrating a solar PV generation system into a DC nano-grid. The simulation models an MPPT algorithm to extract maximum power from the solar PV module and regulate the output voltage of the buck-boost converter at 12V and 24V using PI control. The proposed system directly feeds the maximum available DC power from the solar PV module to the DC nano-grid loads, improving efficiency by reducing conversion stages. The simulation results demonstrate the buck-boost converter maintaining a constant voltage on the DC bus regardless of variations in solar PV generation.
Design and Simulation of PV Based Two-Phase Interleaved Boost Converter IJMER
In this paper, simulation of PV based two phase interleaved boost converter has been
discussed. Interleaved Boost Converter (IBC) serves several applications which require boost in output
voltage such as fuel cells, photovoltaic cells and batteries etc., because it has several advantages over
conventional DC-DC converters. The configuration of IBC comprises parallel combination of a number
of boost converters with same phase shift and switching frequency. This paper deals with the design of
two-phase IBC for a five level cascaded multilevel inverter (MLI). The source for each bridge of the MLI
has been modelled as PV. The simulation has been carried out using MATLAB/SIMULINK
Power Factor Correction Methods
Fixed Capcitors
Synchronous Condensors
Phase Advancers
Switch Capacitors
Static Var Compensator(SVC)
Static Synchronous Compensator(STATCOM)
Modulated power filter capacitor compensator
Economics of power factor improvement
Economical comparison of increasing the power supply
Performance evaluation of Maximum Power Point Tracking algorithm with buck dc...IJERA Editor
The energy crisis concern leads to look for alternate source of energy. Solar energy is considered as most reliable
among the all renewable energy sources. Solar PV (Photovoltaic) is used to convert solar energy into electric
energy. The efficiency of solar PV is very low and its characteristic is nonlinear. To overcome these drawbacks a
technique known as maximum power point tracking is used. This algorithm is implemented in the control circuit
of DC – DC converter. The objective of this paper is to evaluate the MPPT (Maximum Power Point Tracking)
with buck DC-DC converter under load varying conditions. The simulation work is done using PSIM simulation
software.
The document discusses a buck-boost converter which can step up or step down a DC voltage. It operates by alternately connecting the inductor to the input voltage source and output load. When the switch is on, energy is stored in the inductor. When the switch is off, the inductor supplies power to the load while being charged by the capacitor. The duty ratio of the switch controls whether the output voltage is higher or lower than the input. Buck-boost converters have advantages like providing both positive and negative output voltages but require a capacitor with a large ripple current rating.
The document discusses the design and operation of a buck-boost DC-DC converter circuit. It provides details on component sizing, current and voltage ratings, and worst-case analyses. Key aspects covered include inductor and capacitor sizing to limit ripple current and voltage, MOSFET and diode voltage and current ratings, and concluding that 50kHz may be too low a switching frequency for this buck-boost converter design.
A detailed step-by-step procedure for the design of a buck converter. Different active and passive components are selected as per the requirement specified in the design problem.
This document discusses power management circuits and provides an outline for a final year project on the topic. It defines power management as the generation and control of regulated voltages required to operate electronic systems. The document outlines the major components of power management circuits including regulators, converters, and voltage references. It also discusses areas of power management like AC-AC, AC-DC, DC-DC conversion. The project plan is to implement an efficient DC-DC converter circuit for cell phone batteries considering specifications like voltage levels, efficiency, voltage regulation and more.
It’s a power electronics project. It is able to give output voltage(DC) more and less than input voltage as per requirement.
We can generate variable DC voltage which is less than input, but, the special things about this converter is, it has capability to produce variable DC voltage as high as twice the input voltage.
We have specially designed and manufactured inductor for this project.
a project report on MPPT algorithm for PV panelgauravchitransh
The document discusses renewable energy sources such as solar power. It notes that solar power has the potential to supplement power in cities and rural areas by harnessing the sun's energy through solar collectors. The document then discusses different renewable energy sources in detail, including wind power, hydropower, biomass, geothermal, and solar power. It also reviews literature on increasing the efficiency of solar panels through maximum power point tracking algorithms and circuit modeling of photovoltaic modules.
Dokumen tersebut merangkum proses desain buck konverter dan buck-boost konverter untuk mengatur tegangan keluaran. Terdapat beberapa langkah penting dalam merancang kedua konverter tersebut seperti menentukan nilai duty cycle, induktansi, kapasitansi, arus puncak dan tegangan komponen."
IoT Based Distribution Transformer Condition Monitoring SystemIRJET Journal
This document summarizes a research paper on an IoT-based distribution transformer condition monitoring system. The system uses sensors to monitor parameters like current, oil level, moisture content and load to determine the health of distribution transformers remotely. It consists of an Arduino microcontroller, sensors for current, voltage, temperature, oil level, and an LCD display. The sensors transmit readings to the Arduino which displays them on the LCD. If abnormal readings are detected, it communicates this via serial communication. The system aims to continuously and remotely monitor transformer health to reduce maintenance costs and increase transformer lifespan.
IRJET- Diode Clamped Multilevel Inverter for Induction Motor DriveIRJET Journal
1) The document describes a five-level diode clamped multilevel inverter fed induction motor drive system using solar energy as the renewable input source.
2) A multilevel boost converter is used to boost the voltage from the solar panels and balance the DC bus voltages of the diode clamped multilevel inverter.
3) Simulation results show that the five-level inverter provides reduced total harmonic distortion of 4.10% in the output current compared to 48.16% for a two-level inverter, demonstrating improved motor performance from use of the multilevel inverter topology.
Reduction of mismatch and shading loss by useiaemedu
This document summarizes a journal article that analyzes how distributed power electronics can reduce losses from mismatch and shading in photovoltaic (PV) systems. It discusses how micro-inverters and DC-DC converters at the individual panel level can independently track the maximum power point for each panel. This allows recovery of 10-30% of annual performance losses from mismatch and shading that normally occur in centralized inverter systems. The document outlines different converter topologies and analyzes their effectiveness in reducing losses under various shading conditions for residential and commercial PV installations.
Reduction of mismatch and shading loss by use of distributed power electronicsIAEME Publication
This document summarizes a journal article that analyzes how distributed power electronics can reduce losses from mismatch and shading in photovoltaic (PV) systems. It discusses how micro-inverters and DC-DC converters at the individual panel level can independently track the maximum power point for each panel. This allows recovery of 10-30% of annual performance losses from mismatch and shading that normally occur in centralized inverter systems. The document outlines different converter topologies and analyzes their effectiveness in reducing losses under various shading conditions for residential and commercial PV installations.
This document summarizes a research paper on a hybrid AC-DC microgrid system with intelligent load flow control. The system consists of an AC grid connected to conventional AC loads and a DC grid connected to photovoltaic arrays, DC loads, and a battery. An intelligent load flow control system allows users to prioritize devices as critical or non-critical and divert power accordingly. The system aims to reduce multiple AC-DC conversions through direct connections of DC sources and loads, improving efficiency over individual AC or DC grids. Power electronic interfaces like DC-DC converters and a modified sine wave inverter are used to integrate the AC and DC systems. A microprocessor-based intelligent load monitoring system with a web interface is also incorporated.
Design and Implementation of Photovoltaic Module using Multilevel Inverter an...IRJET Journal
This document describes the design of a photovoltaic solar power system that uses a multilevel cascaded H-bridge inverter and dual-stage boost converter. Solar panels generate DC power that is boosted to a higher voltage by a dual-stage boost converter. This output is then fed to a multilevel inverter which produces an AC voltage with reduced harmonic distortion compared to lower level inverters. The document compares the total harmonic distortion of output waveforms from 3, 5, 7, 9 and 11 level inverters and discusses how distortion decreases as the number of levels increases. It also examines filtering the inverter output with an LPF filter to achieve a sinusoidal waveform suitable for feeding into the power grid.
This document summarizes a research paper on a proposed wireless charged inverter. The proposed inverter uses wireless power transmission to charge its battery, eliminating power losses during transmission. It consists of an electrical power transmission circuit, electrical power receiving circuit, voltage regulator, and inverter battery. The transmission circuit transmits AC power wirelessly through induction coils to the receiving circuit. This circuit rectifies the induced power and charges the inverter battery. The inverter then converts the DC battery power to a pure sine wave AC output. Advantages include efficient transmission and a backup power solution. Future applications of wireless power transmission technology are also discussed.
Improved performance of asd under voltage sag conditionsIAEME Publication
This document summarizes a research paper that proposes a new combination technique using a neutral linked Vienna rectifier and Z-source inverter to improve the performance of adjustable speed drives (ASDs) under voltage sag conditions. The technique aims to control voltage sags at the front end to prevent issues in the inverter at the back end. Simulation results show the proposed combination provides more stable DC link voltage and motor speed during sags compared to a normal rectifier and Z-source inverter alone. The research presents the design methodology, calculations, circuit diagram, and experimental waveforms that validate the improved ride through capability of the motor drive system using the neutral linked Vienna rectifier and Z-source inverter combination.
Improved performance of asd under voltage sag conditionsIAEME Publication
This document summarizes a research paper that proposes a new combination technique using a neutral linked Vienna rectifier and Z-source inverter to improve the performance of adjustable speed drives (ASDs) under voltage sag conditions. The technique aims to reduce the effects of voltage sags by providing more stable DC link voltage. Simulation results show that the proposed combination is able to maintain the DC link voltage between 150V to 450V during a sag, preventing large reductions in motor speed, and performs better than a system using only a diode rectifier and Z-source inverter. The researchers conclude that the neutral linked Vienna rectifier with Z-source inverter provides improved ride-through capability for motors even during voltage sag events.
PWM Dimming Control for High Brightness LED Based Automotive Lighting Applica...IJECEIAES
In recent years, the use of high brightness LEDs has become increasingly accepted as light sources in mainstream vehicles. However, LEDs are semiconductor devices having electrical characteristics completely different to the traditional lamps. The output luminous flux of an LED is determined by the forward current running through it. Therefore they cannot be powered directly from the automotive battery using the conventional driving techniques. They require specialized driving systems which can ensure the optimal flow of current through LEDs, while maintaining the required level of output luminous. This paper discusses the importance of luminous control for LED based lamps. A design example of boost type DC-DC switching converter with pulse width modulated (PWM) dimming control is presented. In the end, simulation has been presented using MATLAB/Simulink simulation package to ensure the system’s performance within the desired parameters
IRJET- Designing of Single Ended Primary Inductance Converter for Solar P...IRJET Journal
This document describes the design and modeling of a Single Ended Primary Inductance Converter (SEPIC) DC-DC converter for photovoltaic applications. A SEPIC converter is proposed to boost or buck the variable voltage from a solar panel to meet load requirements. An incremental conductance maximum power point tracking (MPPT) algorithm is used for better efficiency. The converter output is fed to a sinusoidal pulse width modulation inverter to convert DC to AC for AC loads. The SEPIC converter design and component selection process is explained. The system is modeled and tested using MATLAB/Simulink software and shown to reduce ripple current and provide a non-inverted output voltage compared to other converter types.
The document describes a single inductor dual buck inverter topology. It discusses how dual buck inverters can solve issues like shoot-through and reverse recovery without adding dead time. A new topology is presented with a single inductor and series connected diodes. This topology retains advantages of no reverse recovery while improving magnetic utilization by using the full inductor. The topology is simulated in PSIM and results show it generates the expected output voltage waveform from an input DC source. Analysis finds it has high efficiency and no reverse recovery of body diodes due to the diodes preventing current flow through switch body diodes.
IRJET- Implementation of Modified H-Bridge Multilevel Inverter Topology f...IRJET Journal
The document proposes a new seven-level inverter topology based on a modified H-bridge converter for use in solar photovoltaic systems. The proposed topology requires only eight switches to generate seven voltage levels, compared to twelve switches needed in conventional cascaded H-bridge topologies. Simulation results in MATLAB demonstrate the feasibility of the proposed topology, showing it can produce a seven-level output voltage waveform with less than 2% total harmonic distortion using a small filter. Experimental validation with a 10W solar panel and resistive load verifies the simulation results.
This paper explains the project which is a special kind of circular rotating 8 LED display. With the help some mechanical assembly, LED count, hardware requirement, and hence overall cost is cut to very affordable price and power is also saved. Also, maintenance and repairing of the display is so easy, that anyone having a little electronics knowledge can take care of this. All the synchronizing can be implemented through software. First of its kind, made using the 20-pin 8051 series microcontroller, this project use the principle of Space Multiplexing. This propeller display is mechanically scanned and displays the characters in digital format. Made from scrap it can be used anywhere and everywhere and the most amazing fact about this display is its crystal clear display. This display consists of just 8 bright LEDs which are rotated to show the display. For building this project, requirement is just a small 20 pin microcontroller, a position encoder, and LEDs. This display can show the messages, which will require a whopping 525 LEDs. So hardware and cost minimization is achieved and power which is required to run the 525 is also saved by using rotating 8 led display.
This document analyzes the performance of a transformer-less zero-voltage switching buck DC-DC converter for photovoltaic applications. The converter uses a resonant inductor and capacitor to achieve soft switching of the insulated-gate bipolar transistor (IGBT) switch, reducing switching losses and device stress. Simulation results show smooth switching waveforms with the IGBT voltage and current rising and falling gradually. Output voltage ripple is low at 100μV. Soft switching improves the reliability of the power switches by reducing stress. This converter design achieves soft switching suitable for photovoltaic applications.
IRJET - Multicarrier based SPWM Modulation for Diode Clamped MLI to Reduce CM...IRJET Journal
This paper presents a simulation of a 5-level diode clamped multilevel inverter in MATLAB to reduce common mode voltage (CMV) and total harmonic distortion (THD) using multicarrier sinusoidal pulse width modulation (SPWM) techniques. Nine different modulation schemes are analyzed and multicarrier phase disposition PWM is found to produce the lowest THD of 16.95% while maintaining the fundamental frequency at 348.1 Hz. The simulation results show the output line and phase voltages waveforms as well as their harmonic profiles, validating that multicarrier modulation techniques can effectively reduce CMV in diode clamped multilevel inverters.
Design and implementation of push pull converter forrgb led lighting system-2IAEME Publication
This document describes the design and implementation of a push-pull converter to drive an RGB LED lighting system. Three push-pull converters are used to separately control the red, green, and blue LEDs. Arduino microcontroller generates PWM signals to control the converters. Hardware is implemented based on specified parameters. Testing shows the system can successfully produce different colors by varying the duty cycles of each converter to control the intensity of the individual RGB LEDs. Experimental results match the expected operation of producing varying colors in different modes.
THE ADVANCED DESIGNING OF LED DRIVER WITH THE DIFFUSIONAL ACCOMMODATION OF CU...ijiert bestjournal
The High Brightness LEDs for street lighting has ga ined popularity in street lighting owing to energy efficiency and the long life. The amalgamate d feature of brightness and the dimming solutions makes it equally adoptable in outdoor lig htings. The street lighting utilizes the power supply from the lines. The invent of renewabl e energy resources for appliances and illumination systems highlights the usage of solar system for lighting and heating systems. The solar photovoltaic panels are most featured sol utions. The standalone PV systems require the designing knowledge of electrical,thermal and optical properties of LEDs. These parameters allow the development of driver system f or design of the luminaire. Different strategies have been proposed for driver circuits t o provide stable characteristics. The selection of Drivers is dependent on various factor s like,energy efficiency,cost effectiveness,operation and maintenance,losses as sociated with the components and the assembly. The aim is to obtain a stable driver syst em for reliable operation using solar energy. The power supply and the battery management system reflect the efficient operation of the complete system. The approach is to design a nd manage a driver system for highly efficient HB-LEDs for street lighting and commercia l outdoor applications. The multiple stages enhance the efficiency by maintaining the de ciding factors such as power factor,losses and the long life. The 3 stage and expandable conve rter topology uses the maximum power point tracking and empowers the LEDs for required n umber of hours of glowing. An approach has been made to improve the energy conver sion efficiency along with standby power consumption management system during the wint er seasons which is a crucial factor around 92% has been made. The innovative methodolog y provides groundbreaking LED driver systems that help the consumers to gain a co mpetitive edge.
This document discusses the design and simulation of a high-speed CMOS differential current sensing comparator in 0.35μm and 0.25μm technologies. It presents the circuit design of the comparator and output buffer stage. Various comparator characteristics such as propagation delay, speed, power dissipation, offset voltage, and input common mode range are analyzed through simulation in the two technologies. The results show improvements in speed, power dissipation, and input common mode range in the 0.25μm technology compared to the 0.35μm technology.
This document discusses the design and simulation of a high-speed CMOS differential current sensing comparator in 0.35μm and 0.25μm technologies. It presents the circuit design of the differential current sensing comparator and output buffer stage. Various performance metrics of the comparator like propagation delay, speed, power dissipation, offset voltage, and input common mode range are analyzed through simulations in the two technologies. The results show improvements in speed, power dissipation, and input common mode range in the 0.25μm technology compared to the 0.35μm technology.
Similar to Design of a pwm based buck boost dc dc converter with parasitic resistance suitable for led based underground coalmines lighting system (20)
Tech transfer making it as a risk free approach in pharmaceutical and biotech iniaemedu
Tech transfer is a common methodology for transferring new products or an existing
commercial product to R&D or to another manufacturing site. Transferring product knowledge to the
manufacturing floor is crucial and it is an ongoing approach in the pharmaceutical and biotech
industry. Without adopting this process, no company can manufacture its niche products, let alone
market them. Technology transfer is a complicated, process because it is highly cross functional. Due
to its cross functional dependence, these projects face numerous risks and failure. If anidea cannot be
successfully brought out in the form of a product, there is no customer benefit, or satisfaction.
Moreover, high emphasis is in sustaining manufacturing with highest quality each and every time. It
is vital that tech transfer projects need to be executed flawlessly. To accomplish this goal, risk
management is crucial and project team needs to use the risk management approach seamlessly.
Integration of feature sets with machine learning techniquesiaemedu
This document summarizes a research paper that proposes a novel approach for spam filtering using selective feature sets combined with machine learning techniques. The paper presents an algorithm and system architecture that extracts feature sets from emails and uses machine learning to classify emails and generate rules to identify spam. Several metrics are identified to evaluate the efficiency of the feature sets, including false positive rate. An experiment is described that uses keyword lists as feature sets to train filters and compares the proposed approach to other spam filtering methods.
Effective broadcasting in mobile ad hoc networks using gridiaemedu
This document summarizes a research paper that proposes a new grid-based broadcasting mechanism for mobile ad hoc networks. The paper argues that flooding approaches to broadcasting are inefficient and cause network congestion. The proposed approach divides the network into a hierarchical grid structure. When a node needs to broadcast a message, it sends the message to the first node in the appropriate grid, which is then responsible for updating and forwarding the message within that grid. Simulation results showed the grid-based approach outperformed other broadcasting protocols and was more reliable, efficient and scalable.
Effect of scenario environment on the performance of mane ts routingiaemedu
The document analyzes the effect of scenario environment on the performance of the AODV routing protocol in mobile ad hoc networks (MANETs). It studies AODV performance under different scenarios varying network size, maximum node speed, and pause time. The performance is evaluated based on packet delivery ratio, throughput, and end-to-end delay. The results show that AODV performs best in some scenarios and worse in others, indicating that scenario parameters significantly impact routing protocol performance in MANETs.
Adaptive job scheduling with load balancing for workflow applicationiaemedu
This document discusses adaptive job scheduling with load balancing for workflow applications in a grid platform. It begins with an abstract that describes grid computing and how scheduling plays a key role in performance for grid workflow applications. Both static and dynamic scheduling strategies are discussed, but they require high scheduling costs and may not produce good schedules. The paper then proposes a novel semi-dynamic algorithm that allows the schedule to adapt to changes in the dynamic grid environment through both static and dynamic scheduling. Load balancing is incorporated to handle situations where jobs are delayed due to resource fluctuations or overloading of processors. The rest of the paper outlines the related works, proposed scheduling algorithm, system model, and evaluation of the approach.
This document summarizes research on transaction reordering techniques. It discusses transaction reordering approaches based on reducing resource conflicts and increasing resource sharing. Specifically, it covers:
1) A "steal-on-abort" technique that reorders an aborted transaction behind the transaction that caused the abort to avoid repeated conflicts.
2) A replication protocol that attempts to reorder transactions during certification to avoid aborts rather than restarting immediately.
3) Transaction reordering and grouping during continuous data loading to prevent deadlocks when loading data for materialized join views.
The document discusses semantic web services and their challenges. It provides an overview of semantic web technologies like WSDL, SOAP, UDDI, and OIL which are used to build semantic web services. The semantic web architecture adds semantics to web services through ontologies written in OWL and DAML+OIL. Key approaches to semantic web services include annotation, composition, and addressing privacy and security. However, semantic web services still face challenges in achieving their full potential due to issues in representation, reasoning, and a lack of real-world applications and data.
Website based patent information searching mechanismiaemedu
This document summarizes a research paper on developing a website-based patent information searching mechanism. It discusses how patent information can be used for technology development, rights acquisition and utilization, and management information. It describes different types of patent searches including novelty, validity, infringement, and state-of-the-art searches. It also evaluates and compares two major patent websites, Delphion and USPTO, in terms of their search capabilities and features.
Revisiting the experiment on detecting of replay and message modificationiaemedu
This document summarizes a research paper that proposes methods for detecting message modification and replay attacks in ad-hoc wireless networks. It begins with background on security issues in wireless networks and types of attacks. It then reviews existing intrusion detection systems and security techniques. Related work that detects attacks using features from the media access control layer or radio frequency fingerprinting is also discussed. The paper aims to present a simple, economical, and platform-independent system for detecting message modification, replay attacks, and unauthorized users in ad-hoc networks.
1) The document discusses the Cyclic Model Analysis (CMA) technique for sequential pattern mining which aims to predict customer purchasing behavior.
2) CMA calculates the Trend Distribution Function from sequential patterns to model purchasing trends over time. It then uses Generalized Periodicity Detection and Trend Modeling to identify periodic patterns and construct an approximating model.
3) The Cyclic Model Analysis algorithm is applied to further analyze the patterns, dividing the domain into segments where the distribution function is increasing or decreasing and applying the other techniques recursively to fully model the cyclic behavior.
Performance analysis of manet routing protocol in presenceiaemedu
This document analyzes the performance of different routing protocols in a mobile ad hoc network (MANET) under hybrid traffic conditions. It simulates a MANET with 50 nodes moving at speeds up to 20 m/s using the AODV, DSDV, and DSR routing protocols. Traffic included both constant bit rate and variable bit rate sources. Results found that AODV had lower average end-to-end delay and higher packet delivery ratios than DSDV and DSR as the percentage of variable bit rate traffic increased. AODV also performed comparably under both low and high node mobility scenarios with hybrid traffic.
Performance measurement of different requirements engineeringiaemedu
This document summarizes a research paper that compares the performance of different requirements engineering (RE) process models. It describes three RE process models - two existing linear models and the authors' iterative model. It also reviews literature on common RE activities and issues with descriptive models not reflecting real-world practices. The authors conducted interviews at two Indian companies to model their RE processes and compare them to the three models. They found the existing linear models did not fully capture the iterative nature of observed RE processes.
This document proposes a mobile safety system for automobiles that uses Android operating system. The system has two main components: a safety device and an automobile base unit. The safety device allows users to monitor the vehicle's location on a map, check its status, and control functions remotely. It communicates with the base unit in the vehicle using GPRS. The base unit collects data from sensors, determines the vehicle's GPS location, and can execute control commands like activating the brakes or switching off the engine. The document provides details on the design and algorithms of both components and includes examples of Java code implementation. The goal is to create an intelligent, secure and easy-to-use mobile safety system for vehicles using embedded systems and Android
Efficient text compression using special character replacementiaemedu
The document describes a proposed algorithm for efficient text compression using special character replacement and space removal. The algorithm replaces words with non-printable ASCII characters or combinations of characters to compress text files. It uses a dynamic dictionary to map words to their symbols. Spaces are removed from the compressed file in some cases to further reduce file size. Experimental results show the algorithm achieves better compression ratios than LZW, WinZip 10.0 and WinRAR 3.93 for various text file types while allowing lossless decompression.
The document discusses agile programming and proposes a new methodology. It provides an overview of existing agile methodologies like Scrum and Extreme Programming. Scrum uses short sprints to define tasks and deadlines. Extreme Programming focuses on practices like test-first development, pair programming, and continuous integration. The document notes drawbacks like an inability to support large or multi-site projects. It proposes designing a new methodology that combines the advantages of existing methods while overcoming their deficiencies.
Adaptive load balancing techniques in global scale grid environmentiaemedu
The document discusses various adaptive load balancing techniques for distributed applications in grid environments. It first describes adaptive mesh refinement algorithms that partition computational domains using space-filling curves or by distributing grids independently or at different levels. It also discusses dynamic load balancing using tiling and multi-criteria geometric partitioning. The document then covers repartitioning algorithms based on multilevel diffusion and the adaptive characteristics of structured adaptive mesh refinement applications. Finally, it discusses adaptive workload balancing on heterogeneous resources by benchmarking resource characteristics and estimating application parameters to find optimal load distribution.
A survey on the performance of job scheduling in workflow applicationiaemedu
This document summarizes a survey on job scheduling performance in workflow applications on grid platforms. It discusses an adaptive dual objective scheduling (ADOS) algorithm that takes both completion time and resource usage into account for measuring schedule performance. The study shows ADOS delivers good performance in completion time, resource usage, and robustness to changes in resource performance. It also describes the system architecture used, which includes a planner and executor component. The planner focuses on scheduling to minimize completion time while considering resource usage, and can reschedule if needed. The executor enacts the schedule on the grid resources.
A survey of mitigating routing misbehavior in mobile ad hoc networksiaemedu
This document summarizes existing methods to detect misbehavior in mobile ad hoc networks (MANETs). It discusses how routing protocols assume nodes will cooperate fully, but misbehavior like packet dropping can occur. It describes several techniques to detect misbehavior, including watchdog, ACK/SACK, TWOACK, S-TWOACK, and credit-based/reputation-based schemes. Credit-based schemes use virtual currencies to provide incentives for nodes to forward packets, while reputation-based schemes track nodes' past behaviors. The document aims to survey approaches for mitigating the impact of misbehaving nodes in MANET routing.
A novel approach for satellite imagery storage by classifyiaemedu
This document presents a novel approach for classifying and storing satellite imagery by detecting and storing only non-duplicate regions. It uses kernel principal component analysis to reduce the dimensionality and extract features of satellite images. Fuzzy N-means clustering is then used to segment the images into blocks. A duplication detection algorithm compares blocks to identify duplicate and non-duplicate regions. Only the non-duplicate regions are stored in the database, improving storage efficiency and updating speed compared to completely replacing existing images. Support vector machines are used to categorize the non-duplicate blocks into the appropriate classes in the existing images.
A self recovery approach using halftone images for medical imageryiaemedu
This document summarizes a proposed approach for securely transferring medical images over the internet using visual cryptography and halftone images. The approach uses error diffusion techniques to generate a halftone host image from the grayscale medical image. Shadow images are then created from the halftone host image using visual cryptography algorithms. When stacked together, the shadow images reveal the secret medical image. The halftone host image also contains an embedded logo that can be extracted to verify the integrity of the reconstructed image without a trusted third party.