FUE Digital RepositoryThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.http://repository.fue.edu.eg:802019-12-11T21:41:52Z2019-12-11T21:41:52ZVLCI approach for optimal capacitors allocation in distribution networks based on hybrid PSOGSA optimization algorithmAbdelaziz, Almoataz Y.Tulsky, Vladimir N.Diab, Ahmed A. ZakiTolba, Mohamed A.http://repository.fue.edu.eg/xmlui/handle/123456789/52242019-12-05T14:07:17Z2019-01-06T00:00:00ZVLCI approach for optimal capacitors allocation in distribution networks based on hybrid PSOGSA optimization algorithm
Abdelaziz, Almoataz Y.; Tulsky, Vladimir N.; Diab, Ahmed A. Zaki; Tolba, Mohamed A.
The use of Shunt Capacitor Banks (SCB) as a convenient compensation source of reactive power in distribution networks has an efficient role in enhancement voltage profile, correction of power factor and minimizing the network power losses. In this regard, this article investigates the enforcement of a modern robust and effective hybridization of Particle Swarm Optimization besides a Gravitational Search Algorithm (PSOGSA) as an optimization mechanism for solving the problem of optimum SCB allocation with minimizing the annual operating cost and enhancement of the system power quality. Moreover, a new Voltage-Loss-Cost Index (VLCI) has been associated with the proposed optimization technique as an efficient objective function to increase the voltage levels, minimize active power losses and the annual operating cost of the grid. Furthermore, the implemented methodology is introduced in two stages. Firstly, the most appropriate buses for locating SCB are estimated using Loss Sensitivity Factor (LSF). Then, the hybrid PSOGSA optimization algorithm is structured to detect the optimum sitings of SCB and their sizing from the elected buses based on VLCI as the main objective function. The suggested mechanism has been applied on 33-bus besides 69-bus IEEE radial distribution networks. In addition, it is applied on a practicality case study of 111-bus Moscow region radial distribution network. With a view to making certain of the validation of the suggested methodology, the acquired results have been compared with other mechanisms and techniques. The numerical results demonstrated that the suggested optimization technique has superiority with high performance to deduce the optimum decision of SCB allocation for minimizing the network power losses, enhancing the profile of voltage level, and maximizing the net savings as compared to other different techniques.
2019-01-06T00:00:00ZA Novel Graphically-Based Network Reconfiguration for Power Loss Minimization in Large Distribution SystemsZobaa, Ahmed F.Abdelaziz, Almoataz Y.El-Rafei, AhmedAbdel Aleem, Shady H. E.Diaaeldin, Ibrahim Mohamedhttp://repository.fue.edu.eg/xmlui/handle/123456789/52232019-12-05T14:00:02Z2019-07-01T00:00:00ZA Novel Graphically-Based Network Reconfiguration for Power Loss Minimization in Large Distribution Systems
Zobaa, Ahmed F.; Abdelaziz, Almoataz Y.; El-Rafei, Ahmed; Abdel Aleem, Shady H. E.; Diaaeldin, Ibrahim Mohamed
Distribution network reconfiguration (DNR) is the optimized change in the topological structure of distribution systems without violating its radial configuration. DNR has been of interest in applied mathematics and engineering because of its importance in modern power systems. In literature, various optimization techniques that constitute a large area of applied mathematics were proposed to obtain optimized radial configurations; however, most of them were tested in small distribution systems. In this paper, a novel graphically-based DNR is proposed to obtain the optimized radial configurations for power loss minimization. The proposed DNR is based on the graphical representation of the distribution system without any need for a radiality check. Case studies were conducted on 16-, 33-, 70-, 83-, 136-, 415-, 880-, 1760-, and 4400-node distribution systems in order to minimize the total power loss. Results have proven the ability of the proposed graphical DNR for power loss minimization by obtaining fast radial configurations in comparison with previous studies and also its ability to deal with large distribution systems efficiently. The proposed DNR succeeded in minimizing the total losses for large distribution systems as the 880-, 1760-, and 4400-node distribution systems by 69.45%, 72.51%, and 74.35%, respectively.
2019-07-01T00:00:00ZPositive-Sequence Component Based Directional Relaying Algorithm for Single-Pole TrippingAbdelaziz, Almoataz Y.Saha Roy, B. K.Das, P. N.Akter, Samimahttp://repository.fue.edu.eg/xmlui/handle/123456789/52222019-12-05T13:56:05Z2019-09-19T00:00:00ZPositive-Sequence Component Based Directional Relaying Algorithm for Single-Pole Tripping
Abdelaziz, Almoataz Y.; Saha Roy, B. K.; Das, P. N.; Akter, Samima
This paper addresses positive-sequence based protection scheme for series-compensated high-voltage transmission lines
during faults in the presence of single-pole tripping (SPT) condition. Directional relaying algorithm based on the angle
difference between fault and pre-fault positive-sequence current phasor has been proposed to estimate the fault direction
during SPT in transmission lines. The performance of the proposed method has been evaluated by simulating the singlecircuit
system using EMTDC/PSCAD for various fault scenarios considering compensated and uncompensated transmission
line. Discrete Fourier transform technique has been used to estimate the fundamental components. The outcome of different
existing conventional directional relaying techniques has been analysed considering SPT, in the presence and absence of
voltage and current inversion in the compensated/uncompensated system and compared with the proposed technique. To test
the ability of the proposed classifier, the WSCC 9-bus system with capacitor switching and power swing has been tested.
Some abnormal operating conditions have also been considered to prove the robustness of the proposed scheme. Simulation
studies show that the fault direction estimation algorithm efficiently identifies the direction of fault. The performance of the
algorithm shows its consistency and accuracy in estimating the direction of fault during SPT.
2019-09-19T00:00:00ZWhale optimization algorithm to tune PID and PIDA controllers on AVR systemAbdelaziz, Almoataz Y.Attia, Mahmoud A.Mosaad, Ahmed M.http://repository.fue.edu.eg/xmlui/handle/123456789/52212019-11-18T10:00:43Z2019-07-05T00:00:00ZWhale optimization algorithm to tune PID and PIDA controllers on AVR system
Abdelaziz, Almoataz Y.; Attia, Mahmoud A.; Mosaad, Ahmed M.
Power system stability is improved through using Automatic Voltage Regulator (AVR) to adjust the terminal voltage of synchronous generator. Proportional-Integral-Derivative (PID) and Proportional-Integr al-Derivative-Acceleration (PIDA) controllers are used in AVR for excitation control. Whale optimization algorithm (WOA) technique is used in this paper to tune the controllersâ€™ parameters. WOA using PID and PIDA controllers show its superiority through comparison with several optimization techniques. Then comparison between both controllers is carried out and shows that PIDA controller is better than PID controller. Therefore, WOA using PIDA controller is the best system. Robustness analysis is performed to check terminal voltage response with load variation and proved again the superiority of WOA-PIDA system. The contribution of the paper is mainly in analysis by using Root Locus and Bode diagram beside using new optimized controller system in this application.
2019-07-05T00:00:00Z