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Full-Text Articles in Engineering
Hybrid Power Generation Systems: A Holistic View, Almoataz Youssef Abdelaziz
Hybrid Power Generation Systems: A Holistic View, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
The importance of the hybrid power generation systems (HPGS) increased especially in the last few years. HPGS are used to share the load with the utility grid and these systems are termed as HPGS-utility grid. In addition, they are used to transmit the power to the remote areas. In this case, these systems are termed as stand-alone HPGS. HPGS consist of different power sources such as photovoltaic systems (PV), wind turbine (WT), micro-turbine (MT), storage battery (SB), diesel generator, and fuel cell (FC). These sources are considered the prominent elements. The importance of the HPGS can be carried out via …
The Impact Of Distributed Generation On Voltage Stability Using Differential Evolution Optimization Algorithm, Almoataz Abdelaziz
The Impact Of Distributed Generation On Voltage Stability Using Differential Evolution Optimization Algorithm, Almoataz Abdelaziz
Almoataz Youssef Abdelaziz
The electric system has a great problem which is the continuous growth of loads. Hence, the operation of system equipments becomes very close to their marginal limits that result in voltage instability problems. The locations of distributed generators (DGs) have a major effect on the distribution system voltage stability; This paper presents the effect of (DGs) capacity and location on voltage stability enhancement in distribution networks by using different optimization tools such as Genetic Algorithm (GA) and Differential Evolution (DE). The main objective is to decreases power losses in the system to enhance the voltage stability improvement. The simulations have …
Passive And Active Methods Of Islanding Detection For Grid Connected Pv Distributed Generators, Almoataz Youssef Abdelaziz
Passive And Active Methods Of Islanding Detection For Grid Connected Pv Distributed Generators, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
This study proposes a comparison between two islanding detection methods (IDMs) for grid-interconnected distributed generators (DG). The first method is a passive technique based on monitoring the frequency of the system and the rate of change of frequency (ROCOF) at the point of common coupling (PCC).The second method is an active technique based on the injection of a current waveform distortion to the original reference current of the inverter, to force a frequency drift in case of islanding operation. The test results show that there is a difference between the two techniques. Islanding detection methods are investigated, simulated and evaluated …
Optimal Coordination Of Directional Overcurrent Relays Using Hybrid Pso-De Algorithm, Almoataz Youssef Abdelaziz
Optimal Coordination Of Directional Overcurrent Relays Using Hybrid Pso-De Algorithm, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
This paper presents a new approach for the optimal coordination of IDMT directional overcurrent relays in meshed power systems using a hybrid particle swarm optimization based differential evolution algorithm (PSO-DE). In protection coordination problem the total operating time of all main relays is minimized. Constraints of the problem are; backup relay should operate if primary relay fails to respond the fault near to it, Time Dial Setting (TDS) and Plug Setting (PS) and minimum operating time of relay. The operating time of IDMT directional overcurrent relays holds non-linear relationship with TDS and PS. The proposed hybrid optimization algorithm is to …
Static Security Enhancement And Loss Minimization Using A Simulated Annealing Based Approach, Almoataz Youssef Abdelaziz
Static Security Enhancement And Loss Minimization Using A Simulated Annealing Based Approach, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
A developed algorithm for optimal placement and sizing of thyristor controlled series capacitors (TCSC’s) for enhancing the static security of power system and minimizing the overall power system loss is presented in this paper. A procedure to determine the optimal locations and sizes of the thyristor controlled series capacitors is illustrated and presented. The locations are determined by evaluating contingency sensitivity index (CSI) for a given power system branch for a given number of contingencies. Optimal sizes of TCSC’s are determined by the optimization technique of simulated annealing (SA), where TCSC’s settings are chosen to minimize the overall power system …
Technical Comparison Of Harmonic Mitigation Techniques For Industrial Electrical Power Systems, Almoataz Abdelaziz
Technical Comparison Of Harmonic Mitigation Techniques For Industrial Electrical Power Systems, Almoataz Abdelaziz
Almoataz Youssef Abdelaziz
Power system harmonics cause many problems like equipment failures, malfunctions and plant shutdowns. Accordingly, mitigation of these harmonics is considered an important target especially for the industrial applications where any short downtime period may lead to great economic losses. There are at least ten different mitigation techniques to choose from, each with specific technical advantages and disadvantages. Comparative studies for the harmonic mitigation techniques in industrial electrical systems are rarely found in the literature even though they are strongly needed. This paper, almost for the first time, provides comprehensive technical comparisons between the various practical harmonics mitigation techniques in the …
Detection Of Line Outage In Transmission Networks Using Phasor Measurement Units Aided By Support Vector Machine Algorithms, Almoataz Youssef Abdelaziz
Detection Of Line Outage In Transmission Networks Using Phasor Measurement Units Aided By Support Vector Machine Algorithms, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Many protection applications are based upon the Phasor Measurement Units (PMUs) technology. Therefore, PMUs have been increasingly widespread throughout the power network, and there are several researches have been made to locate the PMUs for complete system observability. This paper introduces an important application of PMUs in power system protection which is the detection of single line outage. In addition, a detection of the out of service line is achieved depending on the variations of phase angles measured at the system buses where the PMUs are located. Hence, a protection scheme from unexpected overloading in the network that may lead …
Protection Schemes Based On Support Vector Machine For Thyristor Controlled Series Compensated Transmission Line, Almoataz Youssef Abdelaziz
Protection Schemes Based On Support Vector Machine For Thyristor Controlled Series Compensated Transmission Line, 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 and distance protection schemes, for fault classification in transmission lines with thyristor controlled series capacitor (TCSC) using support vector machine (SVM). The fault classification task is divided into four separate subtasks (SVMa, SVMb, SVMc and SVMg), where the state of each phase and ground is determined by an individual SVM. The polynomial kernel SVM is designed to provide the optimal classification conditions. Wide variations of load angle, fault inception angle, fault resistance and fault location have been carried out …
Phasor Measurement Units (Pmus) Based Fault Location Of Series Compensated Transmission Lines, Almoataz Youssef Abdelaziz
Phasor Measurement Units (Pmus) Based Fault Location Of Series Compensated Transmission Lines, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Phasor Measurement Units (PMUs) have gained a great popularity in the field of control and wide area protection during the last decade. One of the major protection applications based on PMUs technology is to determine the fault location in a transmission line. Therefore, several researches have been developed in the field of fault location. Some of the researches are based on one-end measurements. But, a greater accuracy has been achieved on the basis of two-end measurements. Many researchers suggested only voltage measurements to avoid the current transformers (CT) errors. While, others suggested methods depend on both voltages and current measurements …
Optimal Pmu Placement For Complete Observability Using Heuristic Methods, Almoataz Youssef Abdelaziz
Optimal Pmu Placement For Complete Observability Using Heuristic Methods, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
An essential tool for power system monitoring is state estimation. Phasor Measurement Units (PMUs) can greatly improve the state estimation process. However, for state estimation, the PMUs should be placed appropriately in the network. The problem of optimal PMU placement for full observability is analyzed in this paper. The objective of the paper is to minimize the size of the PMU configuration while allowing full observability of the network. At first, an optimal measurement set is determined to achieve full power system observability with ignoring zero injection buses. Then, the derived schemes are modified to maintain the observability after considering …
Transient Security Classification Using Gene Expression Programming Algorithm, Almoataz Youssef Abdelaziz
Transient Security Classification Using Gene Expression Programming Algorithm, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
No abstract provided.
Fuzzy Based Load Shedding Against Voltage Collapse, Almoataz Youssef Abdelaziz
Fuzzy Based Load Shedding Against Voltage Collapse, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
The phenomenon of voltage collapse eclipses a potential hazard for the transmission and distribution systems. The load shedding for avoiding the existence of voltage instability in power systems is taken as a remedial action during emergency states. The load shedding strategy for power systems with location and quantity of load to be shed is presented in this paper. Two methods are used for this purpose. The first method is based on a mathematical calculation of an indicator of risk of voltage instability. The second method is based on a fuzzy load shedding based algorithm that uses a voltage stability indicator …
Wide Aea Protection (Wap) Systems: Benefits, Schemes, And Examples, Almoataz Youssef Abdelaziz
Wide Aea Protection (Wap) Systems: Benefits, Schemes, And Examples, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
No abstract provided.