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Gradient Histogram Estimation And Preservation For Texture Enhanced Image Denoising

Natural Image Statistics Plays An Important Role In Image Denoising, And Various Natural Image Priors, Including Gradient-based, Sparse Representation-based, And Nonlocal Self Similarity-based Ones, Have Been Widely Studied And Exploited For Noise Removal. In Spite Of The Great Success Of Many Denoising Algorithms, They Tend To Smooth The Fine Scale Image Textures When Removing Noise, Degrading The Image Visual Quality. To Address This Problem, In This Paper, We Propose A Texture Enhanced Image Denoising Method By Enforcing The Gradient Histogram Of The Denoised Image To Be Close To A Reference Gradient Histogram Of The Original Image.

Finger Print Combination For Privacy Protection

The Proposed Novel System For Protecting Finger Print Privacy By Combining Two Different Fingerprints Into A New Identity. In The Enrollment, Two Fingerprints Are Captured From Two Different Fingers. We Extract The Minutiae Positions From One Finger Print, The Orientation From The Other Fingerprint, And The Reference Points From Both Fingerprints. Based On This Extracted Information And Our Proposed Coding Strategies, A Combined Minutiae Template Is Generated And Stored In A Database. In The Authentication, The System Requires Two Query Fingerprints From The Same Two Fingers Which Are Used In The Enrollment. A Two-stage Finger Print Matching Process Is Proposed For Matching The Two Query Finger Prints Against A Combined Minutiae Template.

Intelligent Brain Hemorrhage Diagnosis Using Artificial Neural Networks

Brain Hemorrhage Is A Type Of Stroke Which Is Caused By An Artery In The Brain Bursting And Causing Bleeding In The Surrounded Tissues. Diagnosing Brain Hemorrhage, Which Is Mainly Through The Examination Of A CT Scan Enables The Accurate Prediction Of Disease And The Extraction Of Reliable And Robust Measurement For Patients In Order To Describe The Morphological Changes In The Brain As The Recovery Progresses. Though A Lot Of Research On Medical Image Processing Has Been Done, Still There Is Opportunity For Further Research In The Area Of Brain Hemorrhage Diagnosis Due To The Low Accuracy Level In The Current Methods And Algorithms, Coding Complexity Of The Developed Approaches, Impracticability In The Real Environment, And Lack Of Other Enhancements Which May Make The System More Interactive And Useful. Additionally Many Of The Existing Approaches Address The Diagnosis Of A Limited No Of Brain Hemorrhage Types. This Proposed Method Investigates The Possibility Of Diagnosing Brain Hemorrhage Using An Image Segmentation Of CT Scan Images Using Watershed Method And Feeding Of The Appropriate Inputs Extracted From The Brain CT Image To An Artificial Neural Net Work For Classification. The Output Generated As The Type Of Brain Hemorrhages, Can Be Used To Verify Expert Diagnosis And Also As Learning Tool For Trainee Radiologists To Minimize Errors In Current Methods. The Prototype Developed Using Matlab Can Help Medical Students To Practice The Related Concepts They Learn Using An Image Guide With Examples For Surgeries And Surgical Simulation. System Was Evaluated By The Domain Experts, Like Radiologists, Intended Users Such As Medical Students As Well As By Technical Experts.

Efficient Single Phase Transformer Less Inverter For Grid-Tied PVG System With Reactive Power Control

In This Project, A New High Efficiency Transformer Less Topology Is Proposed For Grid-tied PV System With Reactive Power Control. The New Topology Structure And Detail Operation Principle With Reactive Power Flow Is Described. The High Frequency Common Mode(CM) Model And The Control Of The Proposed Topology Area Analyzed. The Inherent Circuit Structure Of The Proposed Topology Does Not Lead Itself To The Reverse Recovery Issues Even When Inject Reactive Power Which Allow Utilizing MOSFET Switches To Boost The Overall Efficiency. The CM Voltage Is Kept Constant At Mid Point Of Dc Input Voltage, Results Low Leakage Current. Finally, To Validate The Proposed Topology, A 1 KW Laboratory Prototype Is Built And Tested. The Experimental Results Show That The Proposed Topology Can Inject Reactive Power Into The Utility Grid Without Any Additional Current Distortion And Leakage Current. The Maximum Efficiency And European Efficiency Of The Proposed Topology Are Measured And Found To Be 98.54% And 98.29%, Respectively.

Single-Phase Grid Connected Motor Drive System With DC-link Shunt Compensator And Small DC-link Capacitor

This Paper Proposes The DC-link Shunt Compensator(DSC) For Small DC-link Capacitor Systems. DSC Is Located On DC-node Parallel And Operates As The Voltage Source, Improving The System Performances. This Circuit Helps The Grid Current-shaping Control During Grid-connection Time, And Reduces The Flux-weakening Current By Supplying The Energy To The Motor During Grid-disconnection Time. This Project Presents A Power Control Method And The Design Guideline Of DSC. The Feasibility Of DSC Is Verified By Simulation And Experimental Results.

A Single-Stage Single-Switch LED Driver Based On Class-E Converter

This Project Proposes A Single-stage Single-switch Light-emitting Diode (LED) Driver That Integrates A Buck-boost Circuit With A Class-E Resonant Converter By Sharing One Switch Device. The Buck-boost Circuit, Working As A Power Factor Correction (PFC) Stage, Operates In The Discontinuous Conduction Mode (DCM) To Shape The Input Current. The Class-E Converter Steps Down The Voltage To Drive The LED. For Specific Component Parameters, The Class-E Converter Can Achieve Soft-switching On The Power Switch And Two Rectifier Diodes, And Reduce Switch Losses At High Frequencies. Electrolytic Capacitors Are Used In The Proposed Converter To Achieve A Lower Cost, But The System Reliability Decreases. To Overcome This Disadvantage, Film Capacitors Can Be Used, But The Current Ripple Increases. Neglecting The Cost, Multilayered Film Capacitors Are Best Option If Higher Reliability And Lower Current Ripple Are Required. The Proposed Driver Features High Efficiency (90.8%), And A High Power Factor (0.995). In This Paper, Analytical Results And Design Considerations At 100 KHz Are Presented, And A 100-W Prototype With 110 VAC Input Was Built To Validate The Theoretical Analysis.

Optimal Selective Harmonic Mitigation Technique On Variable DC Link Cascaded H-Bridge Converter To Meet Power Quality Standards

In This Project, Power Quality Standards Such AsIEC 61000-3-6, IEC 61000-2-12, EN 50160, And CIGRE WG36-05 Are Fulfilled For Single- And Three-phase Medium-voltageapplications Using Selective Harmonic Mitigation-pulsewidthmodulation In A Cascaded H-bridge (CHB) Converter.Furthermore, The ER G5/4 Power Quality Standard, Whichhas The Strictest Grid Codes At The Medium-voltage Level, Willalso Be Met In The Whole Range Of The Modulation Indices.In Order To Achieve This Goal, A Symmetrical CHB With Variabledc Links Are Employed, While The Converter Has A Low Number Ofswitching Transitions. In Other Words, All Of The Dc Link Voltageshave The Same Voltage, Which Is Dependent On The Modulationindex. Finally, In Order To Validate The Effectiveness And Theapplicability Of The Proposed Method, It Is Verified By Simulationsand Experiments For A Seven-level CHB Converter.

Reactive Power Control For Single Phase Grid Inverters Using Quasi Sinusoidal Waveform

A Control Technique For Grid-tie Inverters, Especially Unfolding Inverters Is Proposed. The Delivered Grid Current Is Modified To The Proposed Quasi Sinusoidal Waveform (QSW) To Carry Reactive Power, And Thus Satisfying The Pf Regulations. The Modified Current Keeps The Same Zero Crossing Points As The Grid Voltage. The Control Technique Allows Reactive Power Injection To Unfolding Topologies, Which Were Limited To Unity Power Factor Operation. The Idea Was To Provide A Quasi Sinusoidal Waveform As A Grid Current Reference To Inject Reactive Power. The Mathematical Models Were Provided And Explained. A Prototype Of A Unipolar Switching Full-bridge Inverter Was Built And Evaluated For The QSW Technique.

Maximum Boost Control Of Diode-Assisted Buck Boost Voltage Source Inverter With Minimum Switching Frequency

A New PWM Strategy To Achieve The Instantaneous Maximum Utilization Of Intermediate Dc-link Voltage, As Well As To Reduce The Switching Frequency Of Power Devices In Diode-assisted Buck–boost VSI. It Extends Voltage Gain And Avoids Extreme Boost Duty Ratio By Introducing A Switch-capacitor Based High Step-up Dc–dc Circuit Between The Dc Source And Inverter Bridge. The Diodes Are Naturally Conducting To Perform Capacitive Charging In Parallel And Discharging In Series To Achieve High Voltage Gain. It Regulates The Average Value Of Intermediate Dc-link Voltage In One Switching Time Period Ts The Same As The Instantaneous Maximum Value Of Three-phase Line Voltage By Controlling The Front Boost Circuit. It Regulates The Average Value Of Intermediate Dc-link Voltage In One Switching Time Period (Ts) The Same As The Instantaneous Maximum Value Of Three-phase Line Voltage By Controlling The Front Boost Circuit.

A Novel Nine-Level Inverter Employing One Voltage Source And Reduced Components As High-Frequency AC Power Source

In This Project, A Nine-level Inverter Employing Only One Input Source And Fewer Components Is Proposed For HFAC PDS. It Makes Full Use Of The Conversion Of Series And Parallel Connections Of One Voltage Source And Two Capacitors To Realize Nine Output Levels, Thus Lower THD Can Be Obtained Without HFM Methods. The Voltage Stress On Power Devices Is Relatively Relieved, Which Has Broadened Its Range Of Applications As Well. Moreover, The Proposed Nine-level Inverter Is Equipped With The Inherent Self-voltage Balancing Ability, Thus The Modulation Algorithm Gets Simplified. The Circuit Structure, Modulation Method, Capacitor Calculation, Loss Analysis, And Performance Comparisons Are Presented In This Paper, And All The Superior Performances Of The Proposed Nine-level Inverter Are Verified By Simulation And Experimental Prototypes With Rated Output Power Of 200 W. The Accordance Of Theoretical Analysis, Simulation, And Experimental Results Confirms The Feasibility Of Proposed Nine-level Inverter

A Multiport Non-Inverting Non-Isolated SEPIC Converter For Storage Application

A DC-DC Multiple Input Multiple-Output (MIMO) SEPIC Converter With Two Input Sources; One Solar Power Input Along With Battery And Fuel Cell Input. Converter Also Supports Three Outputs; One Fixed Voltage Output Along With A Secondary Bidirectional Port. Photovoltaic Based Power System Is Gaining Immense Popularity In Microgrid. However, It Usually Operates On A Low Operating Voltage Level And Possess A Non-uniform Nature. Hence, For These Reasons A Converter Circuit Is Required To Boost DC Voltage Levels And A Other Hybrid (Battery, Fuel Cell) Sources To Support The System In The Absence Of Source Power. The Converter Supports Multiple Sources And Bidirectional Power Flow Potential.

High-Voltage Gain Half-Bridge Z-Source Inverter With Low-Voltage Stress On Capacitor

A New Topology For Half-bridge Z-source Inverter Is Proposed Such That The Proposed Topology Has Only One Impedance Network. Unlike To The Conventional Half-bridge Inverter, The Proposed Topology Can Provide Zero Voltage Level At The Output. It Also Increases Output Voltage Level And Stabilizes It In The Desired Value. Capacitor Voltage Stress In The Proposed Topology Is Low, And, Therefore, Nominal Voltage Of Capacitor And Cost Decreases. In Two New Operations Which Are Named Synchronous Operation Of Diodes And Asynchronous Operation Of Diodes Is Conducted Based On Mathematics Calculations. A Method To Obtain High-voltage Gains By Cascading The Z-network And Combining Middle Inductors Is Presented That Leads To Cost, Size, And Weight Reduction.

New Bridgeless Buck PFC Converter With Improved Input Current And Power Factor

Abstract The Bridgeless Buck Power Factor Correction (PFC) Converters Feature The Merits Of Low Output Voltage And High Efficiency While Their Nature Existing Dead Angles In The Input Current Deteriorate The Input Current Harmonics And Power Factor (PF). Aiming To Reduce The Dead Angles, A New Bridgeless Buck PFC Converter Is Proposed In This Paper. Through Integrating The Main Buck Circuit And The Auxiliary Flyback Circuit With One Magnetic Core, The Dead Angles In Input Current Of The Proposed Bridgeless Buck PFC Converter Is Eliminated So That The Power Factor And Input Current Harmonics Are Improved. The Proposed Bridgeless Buck PFC Converter Is Designed To Operate In Discontinuous Conduction Mode (DCM) With The Merits Of Simple Controller And Nature Current Shaping Ability. A New Logic Control Circuit Is Provided. The Detailed Theoretical Derivations And Design Consideration Are Presented. The Experimental Comparison Among The Proposed Bridgeless Buck PFC Converter, The Conventional Buck PFC Converter And The Conventional Bridgeless Buck PFC Converter Is Displayed To Validate The Effectiveness Of The New Converter.

Flexible Mode Bridgeless Boost PFC Rectifier With High Efficiency Over A Wide Range Of Input Voltage

A Novel FMBL PFC Rectifier Is Proposed, In Which The High Efficiency Over A Wide Input Range Can Be Achieved. In The Proposed Rectifier, A BTBBL PFC Rectifier Is Adopted At High-line Voltages And A Three-level Bridgeless Boost PFC Rectifier (TLBL PFC) Is Formed To Achieve High Efficiency At Low-line Voltages. Compared With The Traditional Bridgeless Boost PFC Rectifier, An Extra Low-voltage Bidirectional Switch (usually Composed Of Two Switches) Is Added; Therefore The Increased Cost Is Low. At Both High- And Low-line Conditions, The Low CM Noise Can Be Achieved Due To The Direct Connection Between The Input Power Grid And The Output Electrolytic Capacitor During Half-line Cycle. The Proposed FMBL PFC Can Be Simply Treated As Two Independent Boost PFC Circuits According To The Line Voltage.

Power Quality Improvement Using Four Leg Three Level NPC Inverter And Second Order Sliding Mode Control

In This Project, A Second Order Sliding Mode Controller Is Proposed For The Power Flow Control Of A HESS, Using A Four Leg Three Level Neutral Point Clamped (4-Leg 3LNPC) Inverter As The Only Interface Between The RES/HESS And The Microgrid. A Three-dimensional Space Vector Modulation And A Sequence Decomposition Based AC Side Control Allows The Inverter To Work In Unbalanced Load Conditions While Maintaining A Balanced AC Voltage At The Point Of Common Coupling. DC Current Harmonics Caused By Unbalanced Load And The NPC Floating Middle Point Voltage, Together With The Power Division Limits Are Carefully Addressed In This Paper. The Effectiveness Of The Proposed Technique For The HESS Power Flow Control Is Compared To A Classical PI Control Scheme And Is Proven Through Simulations And Experimentally Using A 4 Leg 3LNPC Prototype On A Test Bench.

PV Based Step-Up Coupled Inductor Cascade Boost DC-DC Converter With Lossless Passive Snubber For Application Of Motor Drive

A PV Based High Step-up Coupled-inductor Cascade Boost DC-DC Converter With Lossless Passive Snubber Is Fed Through DC Motor. Although A Conventional Cascade Boost Converter Has Larger Voltage Gain Compared To A Boost Converter, It Is Still Not Suitable For High Step-up Voltage Conversion. In The Proposed Converter, A Coupled Inductor Is Adopted For The Cascaded Boost Converter To Further Increase Voltage Gain. However, A Leakage Inductance Of The Coupled Inductor Causes A High Voltage Spike At A Main Switch. A Resistor-capacitor-diode (RCD) Snubber Is Commonly Used To Simply Solve This Problem, But It Is Also The Cause Of Additional Power Loss. Therefore, The Lossless Passive Snubber Is Suggested In Order To Prevent Efficiency Drop By A Snubber Circuit. In Conclusion, The Proposed Converter Has High Voltage Gain And Improved Power Efficiency.

Quad Quadrant Bidirectional DC-DC Converter For Electric Vehicles With High Gain Voltage

To Improve The Energy Quality, Most Of The Renewable Energy Systems And DC Motor Drive Systems Include An Energy Storage Element Charged By The Bidirectional Converter. This Paper Propose Quad Quadrants Dc-dc Converter With High Gain Voltage And Has A Smooth Output Current The Low Current Ripple And High Gain Features Result Are Helpful For Devices. This Paper Propose Bidirectional DC-DC Converter Employs Two MOSFET Switch, Two Capacitor, Two Couple Inductor And One Small Inductor, In This Converter It`s Not Necessary Increase Turn Ratio Transformer For Obtain High Gain. The Simulation And Theoretical Analysis Results Match With Good Agreement. Simulation Using MATLAB/SIMULINK.

A Bidirectional High-Power-Quality Grid Interface With A Novel Bidirectional Noninverted Buck–Boost Converter For PHEVs

The Proposed Bidirectional Converter Has Minimal Grid-level Disruptions In Terms Of Power Factor And Total Harmonic Distortion, With Less Switching Noise. The Integrated Bidirectional Dc/dc Converter Assists The Grid Interface Converter To Track The Charge/discharge Power Of The PHEV Battery. In Addition, While Driving, The Dc/dc Converter Provides A Regulated Dc Link Voltage To The Motor Drive And Captures The Braking Energy During Regenerative Braking.

Fuzzy Logic Controlled Cuk Converter –Inverter Fed Induction Motor Drive With Reduced Torque Ripple

It Deals With The Modelling, Simulation And Implementation Of A Fuzzy Logic Controlled Cuk Converter- Inverter Fed BLDC Motor Drive. This Work Proposes PV Fed Cuk Converter To Produce Required DC Voltage At The Input Of Inverter. The Output Of The Photo Voltaic (PV) System Is Boosted Using A Cuk Converter. The Output Of The Cuk Converter Is Inverted And Applied To A Three Phase Brushless DC Motor. Closed Loop Fuzzy Controlled Systems Are Simulated And Their Responses Are Analyzed. The Fuzzy Controlled Drive System Has Advantages Like Reduced Torque Ripple And Improved Time Domain Response.

PV-HESS Fed BLDC Driven Water Pumping System With PSO-based MPP Tracking Employing Zeta Converter

The Increased Importance Of Renewable Sources In The Field Of Automotive Sector Entails The Use Of Solar Photovoltaic (PV)-fed Water Pumping System Driven By A Brushless DC (BLDC) Motor Drive. To Overcome The Drawback Associated With The Conventional DC-DC Converters, A Zeta Converter Is Employed To Optimize The Power Processing. The Maximum Power Is Extracted From The Solar Array By Controlling The Duty Cycle Of Zeta Converter Through Particle Swam Optimization (PSO) Based Maximum Power Point Tracking (MPPT) Algorithm. To Mitigate The PV Output Variation, Hybrid Energy Storage System (HESS) Is Integrated To The PV System Which Inturn Maintains The Constant Voltage At The Input Of BLDC Motor Drive. A Robust Power Management Algorithm Is Employed For Proper Control Of PV-HESS System. The Overall MPPT With Power Management Control Facilitates The Zeta Converter To Meet Smooth Performance Of The Water Pumping System. The Performance Of The Proposed Controller Is Demonstrated Using MATLAB/Simulink For Variation In Atmospheric Condition And Xilinx System Generator Control Platform Interfaced With Zynq ZC-702 FPGA Kit.

Quasi-Z-Source Indirect Matrix Converter Fed Induction Motor Drive For Flow Control Of Dye In Paper Mill

Variable Speed Induction Motor Drive Finds Its Applications In Transportation Systems, Home Appliances, Paper And Textile Mills, Rolling And Cement Mills, Pumps, Lifts, Compressors, Blowers, Elevator, Conveyors, Crushers, Machine Tools, And Robotics, Etc., In This Most Of Electrical Motor Drives Are Pump, Fan, And Compressor-type Drives. Most Of The Pumps And Fans In Industries Are Used For Fluid Flow Control. In Conventional Flow Control Method, An Induction Motor Is Coupled To The Pump And Runs At Constant Speed. This Method Causes Large Energy Wastage. Speed Control Of The Motor By Converter Can Save Around 20% Energy At Light Load.

Feedback Control Strategy To Eliminate The Input Current Harmonics Of Matrix Converter Under Unbalanced Input Voltages

This Project Proposes A Feedback Control Strategy On The Input Side Of MC. This Strategy Is Based On A Control Method Which Can Modify Input Reference Currents. The Input Control Strategy Is Embedded Into The Output Control Strategy And Thus Is The Inner-loop Of The System Control. The Input-side Controllers Can Be Designed To Achieve Expected Input Control Objectives And Maintain The Output Performance At The Same Time. On This Basis, Resonant Controllers Are Applied To Regulate Input Currents And Instantaneous Active Power, So As To Directly Eliminate The Input Current Harmonics And Meanwhile Ensure The Load Absorbing Constant Active Power Under Unbalanced Input Voltages. The Validity And Feasibility Of The Proposed Strategy Is Verified By The Simulation And Experimental Results.

Single-Stage Wireless-Power-Transfer Resonant Converter With Bridgeless SEPIC Converter

Wireless Power Transfer (WPT) Is Taking Up More And More Roles In Industrial Community. WPT Technology Has A Variety Of Applications With Power Levels Ranged From Several Milliwatts To Tens Of Kilowatts, Including Charging Portable Telephone, Supplying Power For Biomedical Implants, Electric Vehicle (EV) Battery Charging, And Roadway Powering Moving EVs. Compared To Conventional Wired Power Transmission, WPT Technology Is Much More Advantageous: Convenient, Safe, And Reliable. Inductive Coupling Method, As A Traditional WPT Technology, Has Been Researched For A Long Time And Is A Very Efficient Way To Deliver Power Wirelessly Within A Short Distance. However, Power And Efficiency Drop Severely If Transfer Distance Extends Or There Is A Misalignment Between Transmitter And Receiver. Another Efficient WPT Technology For Midrange Transfer, Magnetic Resonant Coupling Approach.

Single-Stage Wireless-Power-Transfer Resonant Converter With Boost Bridgeless Power-Factor-Correction Rectifier

Wireless Power Transfer (WPT) Is Taking Up More And More Roles In Industrial Community. WPT Technology Has A Variety Of Applications With Power Levels Ranged From Several Milliwatts To Tens Of Kilowatts, Including Charging Portable Telephone, Supplying Power For Biomedical Implants, Electric Vehicle (EV) Battery Charging, And Roadway Powering Moving EVs. Compared To Conventional Wired Power Transmission, WPT Technology Is Much More Advantageous: Convenient, Safe, And Reliable. Inductive Coupling Method, As A Traditional WPT Technology, Has Been Researched For A Long Time And Is A Very Efficient Way To Deliver Power Wirelessly Within A Short Distance. However, Power And Efficiency Drop Severely If Transfer Distance Extends Or There Is A Misalignment Between Transmitter And Receiver. Another Efficient WPT Technology For Midrange Transfer, Magnetic Resonant Coupling Approach.

Design Of PI And Fuzzy Logic Controllers For Grid Connected Inverter With STATCOM

A Study Of Static Compensator (STATCOM) For Compensation Of Reactive Power, Harmonic Distortion Mitigation And Load Balancing In Three Phase Three Wire Nonlinear Load Distribution System. The Proposed Control Algorithm Is Developed Based On Synchronous Reference Frame Theory Using PI And FUZZY Logic Controller. The Obtained Reference Current Signal From Control Algorithm Is Compared In Hysteresis Band Current Controller For Better Switching Of STATCOM. The Performance Of STATCOM With PI And Fuzzy Logic Controller Is Also Analyzed And Compared For DC Voltage Regulation And Harmonic Distortion Mitigation .The Proposed Method Is Provided Effective Compensation For Reactive Power, Harmonic Distortion Mitigation And Load Voltage Balancing. The Simulation Results Are Obtained Using MATLAB/SIMULINK Software.

Design And Performance Analysis Of Solar PV Integrated UPQC

Design And Performance Of A Three-phase Solar PV (photovoltaic) Integrated UPQC (PV-UPQC) Are Presented. The Proposed System Combines Both The Benefits Of Distributed Generation And Active Power Filtering. The Shunt Compensator Of The PV-UPQC Compensates For The Load Current Harmonics And Reactive Power. The Shunt Compensator Is Also Extracting Maximum Power From Solar PV By Operating It At Its Maximum Power Point (MPP). The Series Compensator Compensates For The Grid Side Power Quality Problems Such As Grid Voltage Sags/swells By Injecting Appropriate Voltage In Phase With The Grid Voltage. The Dynamic Performance Of The Proposed System Is Simulated In Matlab-Simulink Under A Nonlinear Load Consisting Of A Bridge Rectifier With Voltage-fed Load.

TCSC Controller Design Using Global Optimization For Stability Analysis Of Single Machine Infinite-Bus Power System

It Presents Modeling, Simulation And Optimal Tuning Of Thyristor Controlled Series Compensator (TCSC) Controller For The Improvement Of Stability Of A Single Machine And Multi Machine Power System. Different Controller Structures Namely Lead-Lag (LL) And A Proportional-integral-derivative PID For TCSC Controller Have Been Proposed And A Comprehensive Assessment Of The Effects Of The Tuned TCSC Controller On Test Power System Have Been Carried Out. The Controller Parameters Have Been Tuned Using Global Optimization (particle Swarm Optimization) For IAE Performance Index Of The Power System. The Proposed GO Based TCSC Controllers Damp Out The Oscillations In The State Variables Of The Single And Multi Machine System. Comparative Of Two Machine(single And Multi) Transient Stability Of System Performance We Are Analyzed.

A Superconducting Magnetic Energy Storage Emulator Battery Supported Dynamic Voltage Restorer

This Work Examines The Use Of Superconducting Magnetic And Battery Hybrid Energy Storage To Compensate Grid Voltage Fluctuations. The Superconducting Magnetic Energy Storage System (SMES) Has Been Emulated By A High-current Inductor To Investigate A System Employing Both SMES And Battery Energy Storage Experimentally. The Design Of The Laboratory Prototype Is Described In Detail, Which Consists Of A Series-connected Three Phase Voltage Source Inverter Used To Regulate Ac Voltage, And Two Bidirectional Dc/dc Converters Used To Control Energy Storage System Charge And Discharge.

Power System Voltage Stability Assessment Through Artificial Neural Network

In Present Days, Electrical Load Demand Is Growing Day By Day And In Order To Meet The Increasing Electrical Load Demand, Power Generating Plants Are Operating Their Plants At Their Maximum Capacity. So There Is Always A Risk Of Voltage Collapse, Which Will Cause The Shutdown Of Entire Power System And Its Block Out, Which Will Cause An Inconvenience To The Customers And Great Losses To The Power Utility Companies. It Is Always A Better Practice To Know About The Weakest Elements In The System And Weakest Buses And Their Maximum Loading Limit. The Objective Of This Paper Is To Evaluate The Reliability Using Artificial Neural Network In Voltage Stability Assessment To Determine Secure/insecure State Of The Power System.

Modeling Impedance Design And Efficiency Analysis Of Quasi-Z Source Module In Cascaded Multilevel Photovoltaic Power System

The Quasi-Z Source Cascaded Multilevel Inverter Presents Attractive Advantages In Application To Photovoltaic Power System. Each PV Panel Connects To An H-bridge QZS Inverter To Form A Power Generation Module. The Distributed Maximum Power Point Tracking And All Modules’ Dc-link Peak Voltage Balance Can Be Achieved. However, It Is The Same With The Conventional CMI That The Second-harmonic Voltage And Current Ripples Exist In Each QZSI Module. It Is Crucial For A QZS-CMI To Design The Reasonable QZS Network Parameters To Limit The Ripples Within A Desired Range. This Project Proposes An Analytic Model To Accurately Calculate The 2ω Voltage And Current Ripples Of Each QZSI Module. A QZS Impedance Design Method Based On The Built Model Is Proposed To Limit The 2ω Ripples Of Dc-link Voltage And Inductor Current. Simulated And Experimental Results Through Using The Designed 1.5-kW Prototype Validate The Proposed Analytic Model And The Design Method. Furthermore, This Paper Analyzes All Of The Operating States For A QZSI Module And Calculates The Power Loss. The Measured Efficiency From The Prototype Verifies The Theoretical Calculation, And The QZS-CMI-based Grid-tie PV Power System Is Tested In Practical.

Predictive Direct Power Control For Three-Phase Grid-Connected Converters

The Predictive DPC Algorithms Based On Predictive Selection Of Voltage-vectors’ Sequences Are Proposed. Within Each Sampling Period, This Method First Selects Two Active Voltage Vectors According To The Angular Information Of The Grid-voltage Vector Or The Space Vector Position Of The Virtual Flux. The Action Time Sequence Is Then Calculated By Minimizing The Cost Function, Which Is Constructed Based On The Errors Between The Predicted And The Reference Values Of Active And Reactive Powers. The Calculated Optimal Time Sequence Is Then Transferred To The Modulation Block, And Consequently, The Switch Signals Are Obtained. By Combining Predictive Approach With DPC Theory, This Algorithm Provides Both High Transient Dynamics And Constant Switching Frequency.

Simulation Of Isolated Wind Diesel System With Battery Storage

The Wind-Diesel Power Generation System Is A Hybrid Combination Consisting Of Wind And Diesel As Power Generating Sources. These Types Of Hybrid System Are Designed To Increase Potential Of Generation And Proportionally To Reduce The Cost Of Production. The Existence Of The Wind - Diesel Generation System Started In The Later Part Of 20th Century. The Integration Of Two Generating System Relies Mainly On Complex Controls To Make Certain Of Proper Sharing Of Discontinuous Wind Energy And Handy Diesel Generation To Meet Up The Demand Which Usually Variable In Nature. It Is Also A Major Concern To Reduce The Environmental Impact Of Diesel Generation Which Is Advantage Of The Hybrid Wind Diesel Power Generation. The Transportation Cost Of The Fuel To The Remote Locations Can Be Limited By Effective Use Of This Hybrid System By The Optimal Operation Of The Generations Together.

Analysis Of A High-Power Resonant DC-DC Converter For DC Wind Turbines

A New Method Of Operation For A Series Resonant Converter, With Intended Application In Megawatt High-voltage DC Wind Turbines. Compared To A Frequency Controlled Series Resonant Converter Operated In Sub Resonant Mode, The Method (entitled Pulse Removal Technique) Allows The Design Of The Medium Frequency Transformer For Highest Switching Frequency, While Being Operated At Lower Frequency Without Saturation. The Main Focus Of This Method Is To Identify And Analyze The Operating Modes Of The Converter With Pulse Removal Technique. With The Use Of Variable Frequency And Variable Phase Displacement In Sub Resonant Mode, The New Method Of Operation Promises Transformer Size Reduction And Facilitates Soft-switching Transition Of The IGBTs And Line Frequency Diodes On Rectifier Side. Four Modes Of Operation Are Identified, While Equations For Output Power, Voltage And Current Stress Are Identified. In Order To Control Output Power And Increase Efficiency, Frequency Control In Sub Resonant Is Identified As An Optimal Control Method For High Power Resonant Topologies. But The Drawback Is That The Transformer Needs To Be Designed For Lowest Operating Point. In Order To Solve This Issue, A New Method Of Operation, Entitled Pulse Removal Is Introduced.

Fuzzy Logic Based MPPT For A Wind Energy Conversion System Using Sliding Mode Control

In This Project, The Conventional Hill Climbing Search (HCS) MPPT Algorithm Is Modified Using Fuzzy Logic Theory In A Way That Its Performance Has Been Enhanced In Terms Of Accuracy And Speed. This Modified Algorithm Enables The System To Continuously Extract The Maximum Energy From The Wind By Generating An Appropriate Rotor Speed Reference. Vienna Rectifier Is Used As The Generator-side Converter Due To Its Noticeable Advantages In WECSs.

A Battery Ultracapacitor Hybrid Energy Storage System For Implementing The Power Management Of Virtual Synchronous Generators

This Project Proposes A Hybrid ESS (HESS) Consisting Of A Battery And An Ultracapacitor To Achieve The Power Management Of VSGs. Through Proper Control, The Ultracapacitor Automatically Tackles The Fast-varying Power Introduced By Inertia Emulation While The Battery Implements The Remaining Parts Of A VSG And Only Compensates For Relatively Long-term Power Fluctuations With Slow Dynamics. In This Way, The Proposed HESS Allows Reduction Of The Battery Power Fluctuations Along With Its Changing Rate.

Design Of Modular Flyback Converter For Hybrid Renewable Energy System

Hybrid Energy System Is One Of The Optimal Techniques Which Can Be Efficiently Utilizing The Renewable Energy Resources. As The Renewable Energy Resources Depend Upon The Climatic Condition It Is Difficult To Rely Upon A Single System. In This Paper Wind And Solar Hybrid Energy System Is Used. The Output Of The Two Different Energy Systems Is Fed To The Modular DC-DC Flyback Converter In Input Parallel Output Series (IPOS) Configuration. The System Enjoys The Full Advantages Of Modularity Like High Efficiency And Low Cost. The Flyback Converters Boost The Input Voltage From The Hybrid Energy System. The Output Of The System Is Verified Using MATLAB/Simulink Environment. The Stability Of The System Is Also Assured Due To Modularity. The System Efficiency Can Further Improved By Using More Number Of Flyback Modules And Modern Control Techniques.

Hybrid Energy Storage System Micro Grids Integration For Power Quality Improvement Using Four Leg Three Level NPC Inverter And Second Order Sliding Mode Control

In This Simulation, A Second Order Sliding Mode Controller Is Proposed For The Power Flow Control Of A HESS, Using A Four Leg Three Level Neutral Point Clamped (4-Leg 3LNPC) Inverter As The Only Interface Between The RES/HESS And The Microgrid. A Three-dimensional Space Vector Modulation And A Sequence Decomposition Based AC Side Control Allows The Inverter To Work In Unbalanced Load Conditions While Maintaining A Balanced AC Voltage At The Point Of Common Coupling. The Effectiveness Of The Proposed Technique For The HESS Power Flow Control Is Compared To A Classical PI Control Scheme And Is Proven Through Simulations And Experimentally Using A 4 Leg 3LNPC Prototype On A Test Bench.

Model Predictive Control For Maximum Power Point Tracking Of Quasi-Z-Source Inverter Based Grid-Tied Photovoltaic Power System

Dynamic Behavior Of Solar Energy Necessitates The Use Of Robust Controllers For Photovoltaic (PV) Power Electronics Interfaces. Such Robust Controller Maximizes The Energy Harvest Through Continuous Operation Using A Maximum Power Point Tracker (MPPT). A Model Predictive Control MPPT (MPC-MPPT) Is Proposed In This Paper For A Quasi-Z-source Inverter (qZSI) Based Grid-connected PV Power System. MPC Is A Robust Suboptimal Controller And Is Proposed In This Paper As An Elegant, Embedded Controller. Such Controller Has Shown Better Dynamic Performance Than The Conventional Perturb And Observe (P&O) Technique, Particularly Under Rapidly Changing Meteorological Conditions. The QZSI Is A Single-stage Topology That Can Guarantee MPPT And Control The Injected Power To The Grid Simultaneously.

High-Efficiency Two-Stage Three-Level Grid-Connected Photovoltaic Inverter

It Proposes A High-efficiency Two-stage Three-level Grid-connected Photovoltaic (PV) Inverter. The Proposed Two-stage Inverter Comprises A Three-level Step-up Converter And A Three-level Inverter. The Three-level Step-up Converter Not Only Improves The Power-conversion Efficiency By Lowering The Voltage Stress But Also Guarantees The Balancing Of The Dc-link Capacitor Voltages Using A Simple Control Algorithm. It Also Enables The Proposed Inverter To Satisfy The VDE 0126-1-1 Standard Of Leakage Current. The Three-level Inverter Minimizes The Overall Power Losses With Zero Reverse-recovery Loss. Furthermore, It Reduces Harmonic Distortion, The Voltage Ratings Of The Semiconductor Device, And The Electromagnetic Interference By Using A Three-level Circuit Configuration. It Also Enables The Use Of Small And Low-cost Filters. To Control The Grid Current Effectively, We Have Used A Feed-forward Nominal Voltage Compensator With A Mode Selector. This Compensator Improves The Control Environment By Presetting The Operating Point. The Proposed High-efficiency Two-stage Three-level Grid-connected PV Inverter Overcomes The Low Efficiency Problem Of Conventional Two-stage Inverters, And It Provides High-power Quality With Maximum Efficiency Of 97.4%. Using A 3-kW Prototype Of The Inverter, We Have Evaluated The Performance Of The Model And Proved Its Feasibility.

A Unified Control And Power Management Scheme For PV-Battery-Based Hybrid Microgrids For Both Grid-Connected And Islanded Modes

Battery Storage Is Usually Employed In Photovoltaic (PV) System To Mitigate The Power Fluctuations Due To The Characteristics Of PV Panels And Solar Irradiance. Control Schemes For PV-battery Systems Must Be Able To Stabilize The Bus Voltages As Well As To Control The Power Flows Flexibly. This Paper Proposes A Comprehensive Control And Power Management System (CAPMS) For PV-battery-based Hybrid Microgrids With Both AC And DC Buses, For Both Grid-connected And Islanded Modes. The Proposed CAPMS Is Successful In Regulating The DC And AC Bus Voltages And Frequency Stably, Controlling The Voltage And Power Of Each Unit Flexibly, And Balancing The Power Flows In The Systems Automatically Under Different Operating Circumstances, Regardless Of Disturbances From Switching Operating Modes, Fluctuations Of Irradiance And Temperature, And Change Of Loads.

Blood Cancer Detection Using Image Processing And Computer Vision

Aim Of This Project Detect Leukemia At Earlier Stage With The Help Of Image Processing Techniques. Leukemia Means Blood Cancer Which Is Featured By The Uncontrolled And Abnormal Production Of White Blood Cells (leukocytes) By The Bone Marrow In The Blood. This Project Was Developed Using Various Algorithms And Neural Network Techniques

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