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- Application of Phasor Measurement Units in Power System Protection (4)
- Artificial Intelligence Application to Power System Transient Stability (3)
- Optimal Coordination of Overcurrent Relays (2)
- Protection of Series Compensated Transmission Lines (2)
- Voltage Stability (2)
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- ARMA (1)
- And wide-area disturbances (1)
- Artificial Intelligence Application to Power System Security (1)
- Blackout Cause (1)
- Blackouts (1)
- Box-Jenkins model (1)
- Cascading failures (1)
- Discrete Fourier Transform (DFT) (1)
- Discrete Wavelet Transform (1)
- Distribution System Planning (1)
- Equal-area criterion (1)
- Fault Identification (1)
- Fault Location (1)
- Global positioning system (GPS) (1)
- Harmonics in Power Systems (1)
- Hybrid Power Generation Systems (1)
- Load Shedding (1)
- Methods of Islanding Detection for Grid Connected PV (1)
- Optimal Location of FACTS Devices (1)
- Out of step detection (1)
- Phasor Measurement Unit (PMU) (1)
- Power Loss Reduction of Distribution Systems (1)
- Power system transient stability (1)
- Protection of Distributed Generation Systems (1)
- Time series analysis (1)
Articles 1 - 26 of 26
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 …
Fault Identification For Transmission Lines Using Wavelet Transform, Almoataz Youssef Abdelaziz
Fault Identification For Transmission Lines Using Wavelet Transform, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
This paper presents an algorithm to determine the fault type on transmission line based on wavelet transformation analysis. The algorithm is developed by analyzing the three phase currents (Ia, Ib and Ic) using Wavelet Transformation, and then start to study the faulted phase(s) at different location (each 5% of the transmission line (TL) length). Fault simulation is carried out by EMTDC/PSCAD program. Two seconds window of waveform covering pre-fault and post-fault is used. The discrete wavelet transforms (DWTs) are used for data pre-processing. Four types of mother wavelet are used for signal processing to identify the effective wavelet family that …
Short Term Wind Power Forecasting Using Autoregressive Integrated Moving Average Modeling, Almoataz Youssef Abdelaziz
Short Term Wind Power Forecasting Using Autoregressive Integrated Moving Average Modeling, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Wind energy is one of the most promising electricity generating sources as a clean and free alternate compared with the conventional power plants and due to the volatility feature in the wind speeds it will reflect some problems in power systems reliability particularly if the system is deeply penetrated by wind farms. Therefore, Wind power forecasting issue became and is still an important scope that will help in economic dispatch (ED), unit commitment (UC) purposes to get more reliable and economic systems. This paper introduces short term wind power forecasting model, based on autoregressive integrated moving average (ARIMA) which will …
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.
Management Of Electric Distribution Systems Planning, Almoataz Youssef Abdelaziz
Management Of Electric Distribution Systems Planning, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
In the present paper a proposed planning management method for MV (medium voltage) distribution networks is formulated. This proposed method takes into consideration combined effect of voltage drop; overloads and a technical power loss based on the worst network conditions, and proposes the main constraints of mathematical calculation of the presented case studies. A genetic algorithm (GA) with multi-criteria optimization technique is applied for solving the problem of system reconfiguration in a distribution system. The GA has been tested with promising results on a real radial distribution system. The proposed algorithm can be applied efficiently to large systems, and the …
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 …
Phasor Measurement Units For Out Of Step Detection, Almoataz Youssef Abdelaziz
Phasor Measurement Units For Out Of Step Detection, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Synchronized phasor measurements have become an important technology with several international manufacturers offering commercial phasor measurement units (PMUs) which meet the prevailing industry standard for synchrophasors. With the occurrence of major blackouts in many power systems around the world, the value of data provided by PMUs has been recognized, and installation of PMUs on power transmission networks of most major power systems has become an important current activity. This paper presents a transmission line protection scheme based on synchronized phasor measurement units to detect (predict) out of step condition using equal-area criterion which is consistent with transient energy function method …
Causes Of The Blackout: The Grid Operation And Environment, Almoataz Youssef Abdelaziz
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 …
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.
Fault Classification Of Series-Compensated Transmission Lines Using Support Vector Machine, Almoataz Youssef Abdelaziz
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. …
Optimal Allocation Of Tcsc Devices Using Genetic Algorithms, Almoataz Youssef Abdelaziz
Optimal Allocation Of Tcsc Devices Using Genetic Algorithms, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
This paper presents an approach to find the optimal location of thyristor-controlled series compensators (TCSC) in a power system to improve the loadability of its lines and minimize its total loss. Also the proposed approach aims to find the optimal number of devices and their optimal ratings by using genetic algorithm (GA) with taking into consideration the thermal and voltage limits. Examination of the proposed approach is carried out on the IEEE 9-bus system.
A Classification Technique For Protection Coordination Assessment Of Distribution Systems With Distributed Generation, Almoataz Youssef Abdelaziz
A Classification Technique For Protection Coordination Assessment Of Distribution Systems With Distributed Generation, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
In this paper a novel approach is presented to study the impact of distributed generation on recloser-fuse coordination. This approach is based on the assessment of the recloser-fuse coordination due to the penetration of distributed generation with specified location and capacity for a given fault location. This assessment process acts as a classifier, based on finding the operating sequence of all reclosers and fuses in the path from the faulted node to the substation. This sequence is compared with a pre-required sequence obtained from the protection coordination philosophy, and then provides the distribution system operator with a result indicating whether …
Ann-Based Technique For Predicting Voltage Collapse In Power Systems, Almoataz Youssef Abdelaziz
Ann-Based Technique For Predicting Voltage Collapse In Power Systems, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Voltage stability problems have been one of the major concerns for electric utilities as a result of heavy loading of power system. This paper reports on an investigation on the application of Artificial Neural Networks (ANN) in voltage stability assessment using the energy function technique. A multi-layer feed-forward ANN with error back-propagation learning algorithm is proposed for calculation of Voltage Stability Margins (VSM). Extensive testing of the proposed ANN based approach indicates its validity for determination of power system voltage collapse. Simulation results on two test systems are reported in the paper.
A Neural Network-Based Approach For Control Of Capacitors Installed On Distribution Systems For Power Loss Reduction, Almoataz Youssef Abdelaziz
A Neural Network-Based Approach For Control Of Capacitors Installed On Distribution Systems For Power Loss Reduction, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
A neural network for capacitor switching in electric distribution systems for the purpose of power loss reduction is presented in this paper. An optimization technique (sensitive node method) for allocating the compensating capacitors is used to generate the training set patterns of the neural network. The required input data of the neural network at varying loading conditions are directly obtained from a load flow study of the distribution system. Load variations are assumed to follow a randomized function that generates a randomized matrix which is employed for implementing the different load levels. The developed neural network is based on a …
A Fuzzy Logic Classifier For Transient Stability Assessment, Almoataz Youssef Abdelaziz
A Fuzzy Logic Classifier For Transient Stability Assessment, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Transient stability assessment (TSA) of a power system pursues a two-fold objective: first to appraise the system’s capability to withstand major contingencies and second to suggest remedial actions whenever needed. The first objective is the concern of analysis; the second is a matter of control. To assess transient stability, multitude of techniques are available encompassing traditional time domain state numerical integration, Lyapunov based techniques, probabilistic methods, and recently Artificial Intelligence (AI) techniques. This paper presents a simple but effective fuzzy logic classifier system for TSA. The fuzzy logic-based rule assessment needs only a fraction of time to solve the classification …
An Adaptive Protection Scheme For Optimal Overcurrent Relay Coordination In Interconnected Power Systems, Almoataz Youssef Abdelaziz
An Adaptive Protection Scheme For Optimal Overcurrent Relay Coordination In Interconnected Power Systems, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
This paper presents an adaptive protection scheme for optimal coordination of overcurrent relays (OCR) in interconnected power networks with an improved formulation. The scheme adapts to system changes; new relays settings are implemented as load, generation-level or system-topology changes. The software developed for this application is described. The developed scheme is applied to the IEEE 30-bus test system. Results showed the importance and necessity of this scheme in maintaining the optimal performance of the relays in all conditions.
Transient Stability Estimation Using Artificial Intelligence Methodology: An Inductive Inference Approach, Almoataz Youssef Abdelaziz
Transient Stability Estimation Using Artificial Intelligence Methodology: An Inductive Inference Approach, Almoataz Youssef Abdelaziz
Almoataz Youssef Abdelaziz
Many techniques are used for Transient Stability (TS) estimation of synchronous generators encompassing traditional time domain state numerical integration, Lyapunov based methods, probabilistic approaches and Artificial Intelligence (AI) techniques like pattern recognition and recently neural networks. This paper examines another recently proposed artificial intelligence technique to tackle the transient stability problem. The technique is based on the Inductive Inference Reasoning approach which belongs to a particular family of Machine Learning from Examples. Not only steady state but transient attributes are also used for transient stability estimation so as to reflect machine dynamics and network changes due to faults. The approach …