Power and Energy Commons^™

Pso Based Optimal Placement And Setting Of Facts Devicesfor Improving The Performance Of Power Distribution System, Tibin Joseph

Tibin Joseph

No abstract provided.

Causes Of The Blackout: The Grid Operation And Environment, Almoataz Youssef Abdelaziz

Almoataz Youssef Abdelaziz

Despite huge advancements in different power system components, operations, and protection technologies, todayÕs power systems are more vulnerable to blackouts than ever before. Deregulation, market competition, and increasing demands, in addition to less investment in transmission assets, all contribute to the critical state power systems operate at. Two main characteristics of the power system are always being put under the scope of study, reliability and security. This paper takes a subjective thorough look at the previous numerous blackout events, surveyed by the authors, that have been encountered by different power systems around the globe and classifies them into different types …

Turbine, Vijaya Krushna Varma Mr

VIJAYA KRUSHNA VARMA Mr

Varma designed ultra modern and high efficiency turbines which can use gas, steam or fuels as feed to produce electricity or mechanical work for wide range of usages and applications in industries or at work sites. Varma turbine engines can be used in all types of vehicles. These turbines can also be used in aircraft, ships, battle tanks, dredgers, mining equipment, earth moving machines etc, Salient features of Varma Turbines. 1. Varma turbines are simple in design, easy to manufacture, easy to operate and maintain. 2. Varma turbines are less expensive. 3. Varma turbines have a great power to weight …

Distributed Generator And Their Effects On Distribution System Protection Performance, Hadi Zayandehroodi, Azah Mohamed, Hussain Shareef, Marjan Mohammadjafari

Dr. Hadi Zayandehroodi

The connection of distributed generators (DGs) to distribution networks greatly influences the performance and stability of such networks. Though DGs have significant economic and environmental benefits, increased penetration of DGs will impose significant technical barriers for the efficient and effective operation of bulk power systems. Increased fault current contribution and load flow changes are the major two impacts on utility systems, and these will affect existing protective relaying, especially overcurrent relays. To ensure safe and selective protection relay coordination, the impact of DGs should be taken into account when planning DG interconnection. This paper presents an introduction of distributed generators …

Nonlinear Multivariable Modeling Of Solid Oxide Fuel Cells Using Core Vector Regression, M. Mohammadi, M. Raoofat, Hesamoddin Marzooghi, G. B. Gharehpetiangharehpetian

Hesamoddin Marzooghi

This paper presents new steady-state and dynamic models for solid oxide fuel cells (SOFCs) using core vector regression (CVR). So far, most of conventional SOFC models have been presented based on conversion laws. Due to complex mathematical equations used in these models, they are time-consuming and need large amount of memory to be applied for controller design, especially power electronic interface controller design, generation and load predictions, optimization and other studies. To overcome these problems, some black-box models, such as support vector machine (SVM) and artificial neural network (ANN)-based models have been also proposed for SOFC. In this paper, in …

Impact Of Distributed Generations On Power System Protection Performance, Hadi Zayandehroodi, Azah Mohamed, Hussain Shareef, Marjan Mohammadjafari

Dr. Hadi Zayandehroodi

Though distributed generators (DGs) have significant economic and environmental benefits, increased penetration of DGs will impose significant technical barriers for the efficient and effective operation of bulk power systems. Increased fault current contribution and load flow changes are the major two impacts on utility systems, and these will affect existing protective relaying, especially overcurrent relays. To ensure safe and selective protection relay coordination, the impact of DGs should be taken into account when planning DG interconnection. This paper presents an introduction of DGs and an overview of the impacts of DGs on system protection relay coordination. Several protection issues are …

A Comprehensive Review Of Protection Coordination Methods In Power Distribution Systems In The Presence Of Dg, Hadi Zayandehroodi, Azah Mohamed, Hussain Shareef, Marjan Mohammadjafari

Dr. Hadi Zayandehroodi

This paper presents an overview of solutions proposed in the literature for the overcurrent relay coordination problem in the presence of distributed generators (DGs). Furthermore, several protection issues are identified to study the requirements for protection in the presence of DGs, and possible innovative solutions for resolving the operational conflicts between distribution networks and DGs are also discussed.

Virtual Power Lab - D.E.I. Dayalbagh, D. K. Chaturvedi Dr.

D. K. Chaturvedi Dr.

Electrical Machines and Power systems are the back bone of electrical engineering and play a vital role in industry. Hence, it is essential for electrical engineering students to learn the concepts of power systems and machines. Unfortunately, the students are loosing interest in lab work due to various reasons like unavialability of experimental setups, lack of qualified and motivated lab staff, lab timing, etc. To overcome these problems the virtual Power labs are very important to impart quality experiments.

Exposing To Emf, Prof Dr. Mahmoud Moghavvemi, Farhang Alijani, Hussein Ameri, Maryam Ashayer Soltani

Professor Mahmoud Moghavvemi

In the recent years, by developing the usage of new popular Electronic-Communication gadgets and home appliances like Mobile Phones and Microwave Ovens which are mostly

sources of Electromagnetic Wave Radiation, a severe public concern regarding the sideeffects “whether positive or negative” on human health and environment has been arisen. It means that there are new challenging issues rather than old one “the exposing to low radiofrequency emissions” which have been studied for past decades. Indeed, for more than 100 years, human has exposed to the Radio-waves radiation from Radio & TV broadcasting

transmitters besides the Radar and point to point …

Fault Classification Of Series-Compensated Transmission Lines Using Support Vector Machine, Almoataz Youssef Abdelaziz

Almoataz Youssef Abdelaziz

Recently, series compensation is widely used in transmission. However, this creates several problems to conventional protection approaches. This paper presents overcurrent protection and fault classification approach for series compensated transmission line using support vector machine (SVM). Postfault three lines current samples for half cycle are used as inputs to SVMs. The time taken for fault classification is 10 ms after the fault inception. Four SVMs are used; three SVMs (SVMa, SVMb and SVMc) are used for faulty phase detection and last SVM (SVMg) is used for ground detection. The polynomial kernel SVM is designed to provide the optimal classification conditions. …

Transferts De Chaleur Dans Un Réacteur Thermochimique Solaire Muni D’Un Récepteur Volumique Poreux, Hernando Romero Paredes Rubio

Hernando Romero Paredes Rubio

Un réacteur thermochimique solaire de 1 kW muni d’une structure céramique poreuse en céramique est modélisé pour simuler les transferts thermiques a l’intérieur du récepteur volumétrique. Le modèle développé a été utilisé pour prévoir le comportement thermique du réacteur en fonction des différentes conditions opératoires qui concernent le débit de gaz inerte, le flux solaire incident, la porosité, la longueur du récepteur, et la prise en compte de réactions chimiques. Les résultats montrent que la température maximale est de 1850K pour une concentration solaire de 1000 soleils. La température diminue de manière significative lorsque le débit de gaz augmente. Un …

A New Method For Determining Voltage Sag Source Locations By Using Multivariable Regression Coefficients, Asadollah Kazemi, Azah Mohamed, Hussain Shareef

Dr. ASADOLLAH KAZEMI

This paper presents a new method for locating voltage sag sources in power distribution networks. The proposed method estimates the voltages at the unmonitored buses by using the regression coefficients. First some bus voltages are monitored using power quality recorders in the power distribution system. Then, the voltage deviation index and the standard deviation index, represent the deviation of bus voltages before and after a disturbance are utilized to determine the voltage sag source location. To validate the proposed method, the IEEE 9 bus test system is used. The test results showed that the proposed method is accurate in determining …

Control Of A Bidirectional Z-Source Inverter Forelectric Vehicle Applications In Different Operation Modes, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire

Omar Ellabban

This paper proposes two control strategies for the bidirectional Z-source inverters (BZSI) supplied by batteries for electric vehicle applications. The first control strategy utilizes the indirect field-oriented control (IFOC) method to control the induction motor speed. The proposed speed control strategy is able to control the motor speed from zero to the rated speed with the rated load torque in both motoring and regenerative braking modes. The IFOC is based on PWM voltage modulation with voltage decoupling compensation to insert the shoot-through state into the switching signals using the simple boost shoot-through control method. The parameters of the four PI …

Design And Implementation Of A Dsp Based Dual-Loop Capacitor Voltage Control Of The Z-Source Inverter, Omar Ellabban, Joeri Van Mierlo, Philippe Lataire

Omar Ellabban

The Z-source inverter is a recently proposed single stage converter topology with buck-boost capabilities. This paper proposes a dual-loop capacitor voltage control, with outer voltage loop and inner current loop, of the Z-source inverter (ZSI). Both controller are designed based on a third order small signal model of the ZSI using the direct digital design method. Real-time control algorithm is implemented using DSP linked with MATLAB real time workshop (RTW) as rapid prototyping tool. The feasibility of the proposed dual loop control method has been verified by the simulation and experimental results.

Fifteen Years Of The Dynamic Voltage Restorer: A Literature Review, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.

Tarek Ibrahim ElShennawy

The dynamic voltage restorer (DVR) is a power electronic based device that is used to boost the voltage supplied to the sensitive loads during voltage sags. A DVR consists of an energy storage unit, a voltage source converter, a filter, a coupling transformer and fi nally the controller system. From its fi rst unit installed in 1996, several confi gurations, compensation strategies and controllers have been presented in literature, aiming at fast response, accurate compensation and low costs. In this paper, a literature review is presented scanning the most important contributions in this topic.

Dynamic Voltage Restorer (Dvr) For Voltage Sag Mitigation, Tarek Ibrahim Elshennawy, Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.

Tarek Ibrahim ElShennawy

The Dynamic Voltage Restorer (DVR) is fast, flexible and efficient solution to voltage sag problem. The DVR is a power electronic based device that provides three-phase controllable voltage source, whose voltage vector (magnitude and angle) adds to the source voltage during sag event, to restore the load voltage to pre-sag conditions. The DVR is designed for protecting the whole plant with loads in the range of some MVA. The DVR can restore the load voltage within few milliseconds. Several configurations and control methods are proposed for the DVR. In this paper, an overview of the DVR, its functions, configurations, components, …

Application Of Artificial Intelligent Techniques In Pss Design: A Survey Of The State-Of-The-Art Methods, Mahdiyeh Eslami, Hussain Shareef, Azah Mohamed

Dr. Mahdiyeh Eslami (مهدیه اسلامی)

No abstract provided.

Particle Swarm Optimization For Simultaneous Tuning Of Static Var Compensator And Power System Stabilizer, Mahdiyeh Eslami, Hussain Shareef, Azah Mohamed, Mohammad Khajehzadeh

Dr. Mahdiyeh Eslami (مهدیه اسلامی)

No abstract provided.

Economic Design Of Foundation Using Harmony Search Algorithm, Mohammad Khajehzadeh, Mohd R. Taha, Ahmed El-Shafie, Mahdiyeh Eslami

Dr. Mahdiyeh Eslami (مهدیه اسلامی)

No abstract provided.