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Dr. Hedaya Alasooly Power Factor Correction

Technik
Englisch
14822 Wörter
Keine Altersempfehlung
60
0

Power systems have two components of apparent power: active and reactive power. Both components are necessary for functioning of electrical systems. The active power is the average power absorbed by the resistive load. The reactive power is the measure of energy exchange between the source and reactive power of load. Energy storage devices do not dissipate or supply power, but exchange power with the rest of system. Active power is the one that is converted to other forms of energy in the load yet reactive power is only responsible for magnetizing purposes. Power factor is a ratio depicting how much of the power supplied is real. The reactive current contribute in the value of the overall magnitude of current in transmission lines causing unnecessarily high line currents and low power factor. Since a low power factor means higher amount of apparent power need to be supplied by the utility company, thus the company must also use bigger generators, large transformers and thicker transmission/distribution lines. This requires a higher capital expenditure and operational cost which usually result in the cost being passed to the consumer. In this research, we seek to identify the effects of a low power factor on Swaziland Electricity Company’s power supply system and recommend possible solutions to the problem. The results are useful in determining how to optimally deliver power to a load at a power factor that is reasonably close to unity, thus reducing the utility’s operational costs while increasing the quality of the service being supplied. [mehr]

Stichwörter: Hidaia Alassouli, Reactive Power Compensator, Reactive Power Compensation, Capacitor, Power Factor Correction, Statcom, FACTS Devices, Active Power, Power Flow, Static Var Compensator , Swaziland Electricity Company (SEC), Reactive Power Compensator, Reactive Power Compensation, Capacitor, Power Factor Correction, Statcom, FACTS Devices, Active Power, Power Flow, Static Var Compensator, Swaziland Electricity Company (SEC) [mehr][weniger]

13,99 US$

Dr. Hedaya Mamood Alasooly Some Power Electronics Case Studies Using Matlab Simpowersystem Blockset

Technik
Englisch
5231 Wörter
Keine Altersempfehlung
62
0

Matlab SimPowerSystems is a modern design tool that allows scientists and engineers to rapidly and easily build models that simulate power systems. Not only can you draw the circuit topology rapidly, but your analysis of the circuit can include interactions with mechanical, thermal, control, and other disciplines. The paper covers some case studies that provide detailed, realistic examples of how to use SimPowerSystems in power system analysis. The following types of studies are covered on the paper:1. Thyristor-Based Static Var Compensator: Study the steady-state and dynamic performance of a static var compensator (SVC) on a transmission system.2. Transient Stability of a Power System with SVC and PSS: Study of the application of static var compensator (SVC) and power system stabilizers (PSS) to improve transient stability and power oscillation damping of the system. 3. GTO-Based STATCOM: Study the steady-state and dynamic performance of a static synchronous compensator (STATCOM) on a transmission system. 4. Control of load flow using UPFC: Study the steady-state and dynamic performance of a unified power flow controller (UPFC).5. Variable-frequency Induction Motor Drive: Study of a PWM inverter is used as a variable-voltage, variable-frequency source to drive an induction motor in variable-speed operation.6. Chopper-Fed DC Motor Drive: Study of a DC motor drive with armature voltage controlled by a GTO thyristor chopper.7. VSC-Based HVDC Link: Modeling of a forced-commutated voltage-sourced converter high-voltage direct current (VSC-HVDC) transmission link. [mehr]

Stichwörter: Matlab, Simpowersystem, UPFC, Chopper, FACTS Devices, Series Converter, AC Motor Drives, DC Motor Drives, HVDC Converters, Power System Dynamic Stability, Pulse Width Modulation, Static VAR Compensators, Thyristor Converters

7,99 US$

Dr. Hedaya Mahmood Alasooly Control of Flexible Alternating Current Transmission System (FACTS) for Power Stability Enhancement

Technik
Englisch
30086 Wörter
Keine Altersempfehlung
70
0

The thesis will try to summarise the major power system problems and the important role of the FACTS devices to enhance the power system quality. Then, it will give a brief description for various FACTS and Active Filters controllers as mentioned on the existing publications. Most of the control schemes introduced in the existing papers were designed either for eliminating current harmonics or eliminating voltage flickers or for load flow control. So, this work is devoted to find a proper optimal control schemes for a system with series or shunt or series and shunt converters that can provide all functions together. Various optimal control schemes will be designed for systems with series, shunt and series-shunt converters with the objective to control the load flow through a lines and to eliminate current harmonics and voltage flickers with different strategies for tracking. Chapter 1: Gives a general description of most power system problems and the basic techniques used to improve the power system quality. It also gives idea about basic objectives from the FACTS devices. Chapter 2: Offers detailed description for the basic types of FACTS devices and active filters existing in power industry. Chapter 3: Describes various shunt controllers for control of the Static Compensator (STATCOM) and various series controllers for the control of the Static Synchronous Series Compensator (SSSC) and various Unified Power Flow Controllers (UPFC) as covered in most existing papers. Chapter 4: Describes the major control schemes for the shunt active filter as covered by most existing papers. Chapter 5: Describes the major control schemes for the other types of active filters as covered by most existing papers. Chapter 6: Gives description for optimal control design. Chapter 7: Case studies to design different optimal control schemes for system with UPFC unit to control the power flow, eliminate voltage flicker and eliminate current harmonics. The case studies were repeated for system with only series or shunt converters. [mehr]

Stichwörter: FACTS Devices, Power Quality, Power Reliability, Active Filters, Optimal Control, Suboptimal Control, Current Harmonics, Load Flow, Power Stability, Voltage Flicker, UPFC, Shunt Converter, Series Converter, PhD Thesis

21,99 US$

Simulation of Some Power System, Control System and Power Electronics Case Studies Using Matlab and PowerWorld Simulator

Dr. Hedaya Mahmood Alasooly Simulation of Some Power System, Control System and Power Electronics Case Studies Using Matlab and PowerWorld Simulator

Technik
Englisch
16056 Wörter
Keine Altersempfehlung
86
0

The book consists from three parts concerning simulation of some power system, control system and power electronics case studies using matlab and powerworld simulator programs• Part A: Simulation of Some Power Electronics Case Studies in Matlab Simpowersystem Blockset:• Part B: Control of DC Motor Using Different Control Strategies in Matlab:• Part C: Investigation of the Usefulness of the PowerWorld Simulator Program Developed by “Glover, Overbye & Sarma” in the Solution of Power System Problems:I. Part A: Simulation of Some Power Electronics Case Studies in Matlab Simpowersystem Blockset:This part covers some case studies that provide detailed, realistic examples of how to use SimPowerSystems in modeling power system dynamics in various types of application that use power electronics converters. The following case studies are simulated on the paper:1- Thyristor-Based Static Var Compensator.2. Transient Stability of a Power System with SVC and PSS.3. GTO-Based STATCOM.4. Control of load flow using UPFC.5- Control of AC motor.6- Control of DC motor.7- VSC-Based HVDC Link.II. Part B: Control of DC Motor Using Different Control Strategies in Matlab:A simple model of a DC motor driving an inertial load has the angular speed of the load, , as the output and applied voltage, , as the input. The system was used as an example in [1]. The ultimate goal of this paper is to control the angular rate by varying the applied voltage using different control strategies for comparison purpose. The comparision is made between the proptional controller, integral controller, propotional and integral controller, phase lag compensator, derivitive controller, lead integral compensator, lead lag compensator, PID controller and the the linear quadratic tracker design based on the optimal control theory.III. Part C: Investigation of the Usefulness of the PowerWorld Simulator Program Developed by “Glover, Overbye & Sarma” in the Solution of Power System Problems:The objective of this part is to investigate the usefulness of the power system simulator PowerWorld program developed by “Glover, Overbye &Sarma”. The results obtained from the power simulator program were presented for different case studies. The power system network used in this study consists from 6 buses. Area 1 includes bus 1-5 while Bus 6 will be part of Area 1 in some case studies, or will form separate area 2 in other case studies for comparison purpose. Note that the Available Transfer Capability (ATC) analysis add-on which determines the maximum MW transfer possible between two parts of a power system without violating any limits, and the voltage adequacy and stability tool (VAST) add-on that can solve multiple power flow solutions in order to generate a PV curve for a particular transfer or a QV curve at a given bus, was not studied here because we don’t have yet VAST add-on and the ATC add-on packages. [mehr]

Stichwörter: Matlab, Chopper, Simpowersystem, UPFC, FACTS Devices, Series Converter, AC Motor Drives, DC Motor Drives, HVDC Converters, Power System Dynamic Stability, Pulse Width Modulation, Static VAR Compensators, Thyristor Converters, DC motor, lead compensator, lag compensator, PI compensator, Optimal Control, Tracking, matlab, control system toolbox, Simulink, Power System Simulator, Power World Simulator, Power Flow, Load Frequency Control, Economic Dispatch, Optimal Power Flow, Faults Analysis, Area Control Error [mehr][weniger]

14,99 US$

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