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Article

Studies of Contingencies in Power Systems through a Geometric Parameterization Technique, Part II: Performance Evaluation

1Department of Biosystems Engineering, UNESP- São Paulo State University, Tupã, Brazil

2Department of Electrical Engineering, UNESP- São Paulo State University, Ilha Solteira, Brazil


World Journal Control Science and Engineering. 2014, 2(1), 25-34
DOI: 10.12691/wjcse-2-1-5
Copyright © 2014 Science and Education Publishing

Cite this paper:
Bonini Neto A., Alves D. A.. Studies of Contingencies in Power Systems through a Geometric Parameterization Technique, Part II: Performance Evaluation. World Journal Control Science and Engineering. 2014; 2(1):25-34. doi: 10.12691/wjcse-2-1-5.

Correspondence to: Bonini  Neto A., Department of Biosystems Engineering, UNESP- São Paulo State University, Tupã, Brazil. Email: bonini@tupa.unesp.br

Abstract

In the evaluation of voltage stability where must trace P-V and Q-V curves for each contingency, static analysis methods are used, as the method of load flow and continuation power flow, it should be efficient and reliable in order to meet the requirements needed for applications in the planning and operation stage in real-time. Geometric parameterization schemes have been proposed by the authors in Part I of this paper. In this part of the paper, the results are presented graphically and in terms of numbers of iterations, showing that the proposed methods obtains all P-V curves of the IEEE-14 and 30 buses systems (loading margin of pre-contingency N-0) and all loading margin post-contingency (N-1 simple contingency and N-2 severe contingency), both with a reduced number of iterations.

Keywords

References

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[[1]  Bonini Neto A., and Alves D. A. “Studies of Contingencies in Power Systems through a Geometric Parameterization Technique, Part I: Mathematical Modeling.” World Journal Control Science and Engineering 2.1 (2014): 18-24.
 
[[2]  WSCC-Reactive Power Reserve Work Group (RRWG), “Final Report: Voltage Stability Criteria, Undervoltage Load Shedding Strategy, and Reactive Power Reserve Monitoring Methodology”, 145 p. 1998.
 
[[3]  Xu, W.; Masour, Y. and Harrington, P. G. Planning Methodologies for Voltage Stability Limited Power Systems, Electric Power & Energy Systems, Vol. 15, No 4, pp.221-228, 1993.
 
[[4]  Van Cutsem, T. and Vournas, C. Voltage Stability of Electric Power System, Kluwer Academic Publishers, Boston, 376p., 1998.
 
[[5]  CIGRÉ Working Group 34.08. Protection Against Voltage Collapse, CIGRÉ Technical Brochure, Summary in Electra, No 179, August, pp. 110-126, 1998.
 
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[6]  GRIDCO. Evaluation of GRIDCO’s RFP for Generation in the Grand Prairie Region on March 1998, Final Report.
 
[7]  ESBI Alberta Limited. Assessment of Reactive Power Constraints and Deficiencies of the Alberta Interconnected Electric Transmission System, Project Report, University of Alberta, November, 1998.
 
[8]  Matarucco R. R., Bonini Neto A., Alves D. A. Assessment of branch outage contingencies using the continuation method. International Journal of Electrical Power & Energy Systems, v. 55, p. 74-81, 2014.
 
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Article

Studies of Contingencies in Power Systems through a Geometric Parameterization Technique, Part I: Mathematical Modeling

1Department of Biosystems Engineering, UNESP- São Paulo State University, Tupã, Brazil

2Department of Electrical Engineering, UNESP- São Paulo State University, Ilha Solteira, Brazil


World Journal Control Science and Engineering. 2014, 2(1), 18-24
DOI: 10.12691/wjcse-2-1-4
Copyright © 2014 Science and Education Publishing

Cite this paper:
Bonini Neto A., Alves D. A.. Studies of Contingencies in Power Systems through a Geometric Parameterization Technique, Part I: Mathematical Modeling. World Journal Control Science and Engineering. 2014; 2(1):18-24. doi: 10.12691/wjcse-2-1-4.

Correspondence to: Bonini  Neto A., Department of Biosystems Engineering, UNESP- São Paulo State University, Tupã, Brazil. Email: bonini@tupa.unesp.br

Abstract

An electrical power system is exposed to the occurrence of a large number of contingencies. However, only some of these are severe enough to cause significant damage (collapse voltage, for example) to the system. Thus, before the voltage stability analysis, is realized the selection and ordering of contingencies according to the impact this cause to the system, reducing the computational time of the analysis. This paper presents a geometric parameterization technique for the continuation power flow which allows the tracing complete of P-V curves and the calculation of the maximum loading point (MLP) of power systems without the ill-conditioning problems of Jacobian matrix (J). This occurs before and after a contingency, i.e., this technique provides all the P-V curve of the pre and post contingency with addition of a line in the λ-V and λ-θ plans. The results obtained with the methodology to the IEEE 14 and 30 bus systems show that the characteristics of the conventional method are improved and the convergence region around the singularity is enlarged. The goal is to present the method with simplicity and easy interpretation.

Keywords

References

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[[5]  Cañizares C.A., Alvarado F.L. Point of collapse and continuation methods for large ac/dc systems, IEEE Trans. on Power Syst. 8 (1993) 1-8.
 
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[9]  Magalhães, E. M.; Bonini Neto, A.; Alves, D. A.. A Parameterization Technique for the Continuation Power Flow Developed from the Analysis of Power Flow Curves. Mathematical Problems in Engineering, v. 2012, p. 1-24, 2012.
 
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Article

Using Clonal Selection Algorithm to Optimal Placement with Varying Number of Distributed Generation Units and Multi Objective Function

1Department of Engineering, Institute of Higher Education, Allameh Mohaddes Nouri, Nour, Iran

2Department of Engineering, Damghan Branch, Islamic Azad University, Damghan, Iran


World Journal Control Science and Engineering. 2014, 2(1), 12-17
DOI: 10.12691/wjcse-2-1-3
Copyright © 2014 Science and Education Publishing

Cite this paper:
Shahryar Tamandani, Majid Hosseina, Mohammad Rostami, Amir Khanjanzadeh. Using Clonal Selection Algorithm to Optimal Placement with Varying Number of Distributed Generation Units and Multi Objective Function. World Journal Control Science and Engineering. 2014; 2(1):12-17. doi: 10.12691/wjcse-2-1-3.

Correspondence to: Mohammad  Rostami, Department of Engineering, Damghan Branch, Islamic Azad University, Damghan, Iran. Email: tarrah.arman@yahoo.com

Abstract

In recent years, Clonal Selection Algorithm have gained a lot of attention from the optimization research community. In this paper, Clonal Selection algorithm is presented to an optimal placement method in order to sizing and sitting of distributed generation in IEEE 33 bus test system. The proposed objective function considers active power losses of the system and the voltage profile in nominal load of system. In order to use of Clonal Selection Algorithm, at first, placement problem is written as an optimization problem which includes the objective function and constraints, and then to achieve the most desirable results, Clonal Selection Algorithm is applied to solve the problem. High performance of the proposed algorithm in mention system is verified by simulations in MATLAB software and in order to illustrate of feasibility of proposed method this optimization in three cases – one DG unit, Two DG units, and Three DG units- will accomplish.

Keywords

References

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[[5]  A. Keane, et al., Optimal distributed generation plant mix with novel loss adjustment factors, IEEE Power Engineering Society General Meeting 18-22 (June 2006) 6.
 
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Article

Design and Development of an Automated Home Control System Using Mobile Phone

1Department of Electronic and Computer Engineering, Lagos State University, Epe Campus, Epe, Lagos, Nigeria


World Journal Control Science and Engineering. 2014, 2(1), 6-11
DOI: 10.12691/wjcse-2-1-2
Copyright © 2014 Science and Education Publishing

Cite this paper:
L.A Akinyemi, O.O Shoewu, N.T Makanjuola, A.A Ajasa, C.O Folorunso. Design and Development of an Automated Home Control System Using Mobile Phone. World Journal Control Science and Engineering. 2014; 2(1):6-11. doi: 10.12691/wjcse-2-1-2.

Correspondence to: O.O  Shoewu, Department of Electronic and Computer Engineering, Lagos State University, Epe Campus, Epe, Lagos, Nigeria. Email: engrshoewu@yahoo.com

Abstract

This paper presents design and development of an Automated Home Control System (AHCS) using mobile phone. A cell (mobile) phone acts as a modem for the control of electrical home appliances. This is achieved when the mobile phone number is dialed and an appropriate command button is pressed. The paper demonstrates how to develop a system that aids the control of remote devices using mobile phones to enable devices without infrared though connected to power sources to be controlled and considering the possibility of users to monitor the status and usage of these devices. It makes use of a programmable interface controller (PIC) to control the switching of the output. This design is customized as a central device for four pieces of home appliances using relay to activate each of the respective electronic gadgets.

Keywords

References

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Article

Automatic Speech Recognition for Tamazight Enchained Digits

1Laboratory of Modeling and Calculation, Faculty of Sciences and Technics, BeniMellal

2Team of Information Processing and Telecommunication, Faculty of Sciences and Technics, BeniMellal


World Journal Control Science and Engineering. 2014, 2(1), 1-5
DOI: 10.12691/wjcse-2-1-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
A. EL GHAZI, C. DAOUI, N. IDRISSI. Automatic Speech Recognition for Tamazight Enchained Digits. World Journal Control Science and Engineering. 2014; 2(1):1-5. doi: 10.12691/wjcse-2-1-1.

Correspondence to: A.  EL GHAZI, Laboratory of Modeling and Calculation, Faculty of Sciences and Technics, BeniMellal. Email: hmadgm@yahoo.fr

Abstract

The evolution of humane-machines dialogue involved the apparition of a new security management technique. For this reason, there are a lot of systems that uses voice stamps and signal processing. In this work, we have treated a first stage of a security system that consists on password validation devoted to Tamazight dialect. In this context, an automatic speech recognition system for Tamazight enchained digits is established. We have based on construction rules of these digits to minimize a training database and to avoid the overlap between different numbers to increase a recognition rate.

Keywords

References

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Article

Cost Optimization of Maintenance Scheduling for Wind Turbine Gearbox Components with Assured Reliability

1Automotive Engineering Department, Helwan University, Cairo, Egypt


World Journal Control Science and Engineering. 2013, 1(1), 25-34
DOI: 10.12691/wjcse-1-1-4
Copyright © 2013 Science and Education Publishing

Cite this paper:
Shawki A. Abouel-seoud, Mohamed I. Khalil. Cost Optimization of Maintenance Scheduling for Wind Turbine Gearbox Components with Assured Reliability. World Journal Control Science and Engineering. 2013; 1(1):25-34. doi: 10.12691/wjcse-1-1-4.

Correspondence to: Mohamed  I. Khalil, Automotive Engineering Department, Helwan University, Cairo, Egypt. Email: mohamedibrahim71@yahoo.com

Abstract

The operation of a particular component in deteriorating condition will lead to a high machine downtime. This is due to the failure of component at unexpected time. As a result it will increase cost of maintenance and production lost. One of the solutions to this matter is to use Preventive Replacement (PR). PR is one of the maintenance optimization strategies that can balance the failure cost in unexpected time (maintenance and production lost) and maintenance benefits (minimize downtime) for a deteriorating component. Therefore, the objective of this paper is to introduce the PR strategy for determining an optimal replacement time for component that deteriorates over time. The models are used for the cost per unit time based on the stochastic behavior of the assumed system. The model reflects the cost of storing a spare as well as the cost of system downtime. The minimum-cost (optimum) policy time is calculated with the consideration of availability. It is noted that all maintenance cost results converge to the optimal value of the age replacement policy which has the same configuration when inspection interval increases.

Keywords

References

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Article

Controllers Tuning through Multi-objective Non-Dominated Sorting Genetic Algorithms

1Department of Computer Science, University of Sciences and Technology USTO’MB, El Mnouar, Algeria


World Journal Control Science and Engineering. 2013, 1(1), 15-24
DOI: 10.12691/wjcse-1-1-3
Copyright © 2013 Science and Education Publishing

Cite this paper:
CHOURAQUI Samira, BENZATER Habiba. Controllers Tuning through Multi-objective Non-Dominated Sorting Genetic Algorithms. World Journal Control Science and Engineering. 2013; 1(1):15-24. doi: 10.12691/wjcse-1-1-3.

Correspondence to: CHOURAQUI  Samira, Department of Computer Science, University of Sciences and Technology USTO’MB, El Mnouar, Algeria. Email: s_chouraqui@yahoo.fr

Abstract

In control system design there are often a number of design objectives to be considered. The objectives are sometimes connecting and no design exists which can be considered best with respect to all objectives. Hence, there is an inevitable tradeoff between design objectives, for example, between and output performance objective and stability robustness. These considerations have led to the study of multi objective optimization methods for control systems. In this paper a multi-objective Non-Dominated sorting genetic Algorithms NSGA-II is used to tuning of Proportional Derivative (PD) controller of a six freedom arm manipulator PUMA560. The NSGAII algorithm searches for the controller PD gains so that the six values of Integral Absolute Error (IAE) in joint space are minimized. Simulation numerical results of multivariable PD control and convergence of the NSGA-II are presented and discussed.

Keywords

References

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Article

Some Algorithms for Large Hidden Markov Models

1University Sultan Moulay Slimane, Laboratory of modelisation and calcul, Béni Mellal


World Journal Control Science and Engineering. 2013, 1(1), 9-14
DOI: 10.12691/wjcse-1-1-2
Copyright © 2013 Science and Education Publishing

Cite this paper:
Sanaa Chafik, Daoui Cherki. Some Algorithms for Large Hidden Markov Models. World Journal Control Science and Engineering. 2013; 1(1):9-14. doi: 10.12691/wjcse-1-1-2.

Correspondence to: Sanaa Chafik, University Sultan Moulay Slimane, Laboratory of modelisation and calcul, Béni Mellal. Email: san.chafik@gmail.com

Abstract

The Hidden Markov Model (HMM) has become increasingly popular in the last several years because it is used in a wide range of applications. There are some inherent limitations of this type of statistical model. The major limitation of HMM is large hidden state space, which limits their practical purview. The objective of this work is to reduce the task of solving some classical algorithms (Forward, Backward, Baum-Welch) by review of their theoretical aspects, offering faster improved algorithms based on the decomposition technique which represent a general approach to solving a problem by breaking it up into smaller ones and solving each of the smaller ones separately.

Keywords

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Article

Optimal Wind Turbine Planetary Gearbox Replacement Decision Using Vibration Monitoring and Hazard Model

1Automotive Engineering Department, Helwan University, Cairo, Egypt


World Journal Control Science and Engineering. 2013, 1(1), 1-8
DOI: 10.12691/wjcse-1-1-1
Copyright © 2013 Science and Education Publishing

Cite this paper:
Shawki A. Abouel-seoud, Mohamed I. Khalil. Optimal Wind Turbine Planetary Gearbox Replacement Decision Using Vibration Monitoring and Hazard Model. World Journal Control Science and Engineering. 2013; 1(1):1-8. doi: 10.12691/wjcse-1-1-1.

Correspondence to: Mohamed I. Khalil, Automotive Engineering Department, Helwan University, Cairo, Egypt. Email: mohamedibrahim71@yahoo.com

Abstract

A reliable machine fault prognostic system can be used to forecast damage propagation trend in rotary machinery and to provide an alarm before a fault reaches critical levels. Wind turbine planetary gearbox components have no exception, where hazard rate model was used. The objective of this paper is focused specifically on the use of a generalized statistical method for characterizing and predicting system Weibull density function hazard rate that best corresponds to the given set of filtered vibration data. The prognostic performance was illustrated using five types of gearbox faults. Faults have been artificial made in the wind turbine gearbox components, where the details and dimensions of these faults are presented. The failure hazard rate in terms of RMS value of rotational vibration acceleration prediction was considered. The information incurred in this paper can help for prognostic procedure. The results show that the predicted RMS of vibration acceleration response at failure based on the Weibull distribution with assured reliability was quite close to the healthy value for planet gear tooth spalling followed by planet gear tooth breakage, planet gears carrier crack and main bearing inner race crack with the less close of planet gear tooth crack. The results show that the predictive failure hazard rates are effective in estimating the progress of the prognostic process well in advance of the impending catastrophic failure. Moreover, the results also show the effectiveness of using the hazard rate model in estimating the variations of the failure hazard rate.

Keywords

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