Home > Archives > Latest issue
International Review of Automatic Control - Papers
The Improvement of Power System Transient Stability Using an UPFC
by
Salim Haddad, Ali Haddouche
Vol. 5. n. 4, pp. 432-437
Abstract - Power system stability is the ability of an electric power system, for a given initial operating condition, to regain a state of operating equilibrium after being subjected to physical disturbance. This paper presents simulation analyses of transient stability of the Algerian ELHadjar's power system during faults. This latter fed by local production coupled on distribution (225 KV and 63 KV) system, which consists of many medium voltage motors (5.5 KV), may be they are the significant instabilities. This can lead to both risks of operating losses, and also serious risks of damage especially at t he rotating machines.
UPFC is a FACTS device can be used to control active and reactive power flows in a transmission line. The damping of power system oscillations after a three phase fault is also analyzed by the effect of UPFC on transient stability performance of a power system.
A general program for transient stability power system including UPFC is developed and tested on ELHadjar's test system.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Synchronous Machine, Power System, Transient Stability Faults, UPFC, Modelling, Simulation.
Smart Designing and Implementing Time-of-Use Program in Generation Scheduling Problem
by M. Rahmani-Andebili, M. S. Rahmani-Andebili
Vol. 5. n. 4, pp. 438-446
Abstract
- Present study investigates generation scheduling problem associated with smart designing and implementing Time-of-Use (TOU) Program. The optimal schedule minimizes the generation cost and implementation cost of TOU during the study period while satisfying load demand, spinning reserve requirements, and the physical operational constraints of units. In this paper, the generation scheduling with TOU problem as a nonlinear and non convex problem is solved using the Simulated Annealing (SA) method. In this regard, the effect of intelligent implementation of TOU on decreasing the cost of unit commitment (UC) has been studied. It is shown that irrational implementation of TOU could result in increasing the cost of problem. Numerical studies show a significant improvement in the results of the problem.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Unit Commitment (UC), Time-Of-Use (TOU) program, Consumer’s Surplus Function.
Vol. 5. n. 4, pp. 447-451
Abstract - This paper presents a novel design technique for a new type of controllers, the zero-reflection controller (ZRC). This type of controllers is designed specially for damping and mitigation of electromechanical wave propagation in large scale power systems. Electromechanical wave propagation always follows disturbances that may occur at any point in these power systems, and can affect its performance. The one-dimensional ring power system with 44 generators is taken under study in this paper. The continuum principle which is used for the analysis of the proposed power system yields to a set of nonlinear second order partial differential (wave) equations. So, the discretization concept was applied in this paper. Design and analysis of the ZRC and its effects is performed for different cases in the proposed power system. MATLAB package is used to carry out the different simulations of discrete power system model to mitigate/eliminate the spatial propagation of electromechanical disturbance. From which, some of the wave propagation parameters like finite wave phase velocity are calculated. Simulation results in different situations are presented and discussed. These results present and show the important effects of ZRCs on the mitigation of electromechanical wave propagation in the proposed one-dimensional ring power system.
Copyright © 2012 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Electromechanical Wave Propagation, Zero-Reflection Controllers (ZRC), One-Dimensional Ring Power System, Continuum Model.
Enlarging the Robust Domain of Attraction in Nonlinear Polynomial Uncertain Systems
by
Faiçal Hamidi, Houcem Jerbi, Mohamed Naceur Abdkrim
Vol. 5. n. 4, pp. 452-461
Abstract - The paper deals with the problems of robust stability for uncertain nonlinear polynomial systems. We consider the problem of the enlargement of the Robust Domain of Attraction (RDA). We propose a method to compute invariant subsets of the RDA for the asymptotically stable equilibrium point of polynomial systems. We use an optimization strategy based on Linear Matrix Inequality (LMI), to compute the RDA. The main contribution consists in a preliminary estimation of the general form of this region obtained by Trajectory Reversed Method (TRM) for all uncertain parameters. Moreover, an explicit determination of the RDA by using a parameterized Lyapunov Function is proposed. Such result is obtained by combined Threshold Accepting Algorithms (TAA) and LMI. An example is given to illustrate the efficiency of the proposed approach.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Stability, Robust Domain of Attraction (RDA), Polynomial system, Lyapunov Function.
Precision Position Control of the Induction Machine
by Adnan Derdiyok, Abdullah Başçi
Vol. 5. n. 4, pp. 462-468
Abstract - This paper presents the experimental validation of a robust position control structure of an indirect field oriented (IFO) induction motor (IM) based on chattering free sliding mode (CFSM) controller. The controller has been tested for various command positions through the simulation and experiment. The results verify the control theory and demonstrate the usefulness of the proposed control scheme. The experimental results are given for step position references that change from 1 rad to 30 rad. It is observed that the tracking performance is very good at all references and the resulting control signals are smooth. Finally, the simulation and experimental results are shown to be in a very close agreement.
Copyright © 2012 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: Position Control, Induction Motor, Sliding Mode Control.
Optimal Tuning of PID Controller Using Real-Coded Genetic Algorithm for AVR Systems
by K. Aarthi, S. K. Haritha, R. Rengaraj
Vol. 5. n. 4, pp. 469-475
Abstract - In this paper, tuning of Proportional–Integral–Derivative (PID) controller in Automatic Voltage Regulation (AVR) system is presented. AVR system helps to maintain the power system voltage within the limits of acceptance. This can be efficiently realized by interfacing a PID controller with the AVR system. In this paper, implementation of real-coded Genetic Algorithm (GA) for tuning of PID controller parameters has been demonstrated. The proposed method is robust, easy to implement and hence fast tuning of PID controller is achieved. This method ensures the stability of AVR system.
Copyright © 2012 Praise Worthy Prize S.r.l. - All rights reserved
Keywords: PID Controller, Real-Coded Genetic Algorithm.
An Effective Predictive Controller Design for Asynchronous Motor
by Igor Bélai, Milan Žalman
Vol. 5. n. 4, pp. 476-480
Abstract - In this paper a controller of both the flux and the torque components of the stator current vector of the asynchronous motor is proposed. The current controller is composed of two parts: the predictive and the PI components. The reference stator voltage vector generated via the PWM is the output of the controller. Predictive component applies in transients states when it improves control dynamics. PI component eliminates the current vector caused by changes in motor parameters. Proposed methodology was verified by simulation. The simulation results confirm high performance of the proposed control for application for asynchronous motor. The proposed method supports software implementation.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Vector Control, Predictive Controller.
Modeling,
Simulation and Design of an Optimal Controller for Wind Turbine Including V/F
Strategy
by E.
Nekooei, M. R. Alizadeh Pahlavani
Vol. 5. n. 4, pp. 481-489
Abstract - In this
paper, a grid-connected wind energy converter system is proposed. An
overall dynamical model for the proposed wind turbine system is
considered. The verification of the model is investigated by simulating
the active and reactive powers response of the overall model to step
changes in selected input variables such as MC frequency, gain voltage,
wind velocity. Moreover, v/f strategy is described and a linear model of
the system is developed at a typical operating point for the model
including v/f strategy, evaluation of this linear model investigated
with nonlinear model and in the end a LQR optimum control is designed
for the system. The nonlinear and linear governing equations of the
system are implemented using MATLAB. The nonlinear obtained results show
that the settling time of closed loop system using LQR step response is
0.002 sec., steady state error is zero and overshoot is zero too, which
is highly acceptable for performance goals of this system.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Wind turbine, MC, LQR.
A
Closed Loop System for Inverter Assisted Wind Driven Induction Generators for
Supplying Isolated Loads
by P. Raja,
N. Kumaresan, M. Subbiah
Vol. 5. n. 4, pp. 490-497
Abstract - A closed
loop operation of inverter assisted wind driven induction generators has
been described. The four modes of operation of the generator-inverter
system have been cleared illustrated with phasor diagrams. The various
steps in the design of the system have been outlined. The experimental
results and wave forms obtained on a small generator-inverter-load set
up, validate the analysis and closed loop control operation presented in
the paper.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Induction Generator, PWM Three-Phase Inverter, Battery, Stead State Analysis, Wind Energy.
Smart-Wire
Approach for Upgrading Power Systems with Wind Generation
by
A. Elmitwally
Vol. 5. n. 4, pp. 498-505
Abstract - This
paper presents the distributed series reactor (DSR) as a low cost
D-FACTS technology that can be easily clamped on working transmission
lines at higher operational reliability and without the need of any
communications or centralized control. Smart wires are standard
transmission lines that are augmented with a large number of DSRs. The
paper addresses the potential of the emerging smart wire technology in
improving the utilization and reliability of the existing transmission,
sub transmission, and distribution networks. It proposes a smart-wire
based strategy for planning power systems with increasing penetration
level of wind generation. Moreover, the paper evaluates the potential of
the smart-wire technology to reduce the required investment for
congestion-free transmission system upgrading plan. The proposed
approach is applied to the IEEE 39-bus and IEEE 57-bus test systems.
Comparative analysis of results is provided for the classic and smart
planning methods.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Smart Wires, Congestion, Renewable Generation.
On
a Sliding Mode Control for Power Factor Correction
by S. Ben
Said, K. Ben Saad, M. Benrejeb
Vol. 5. n. 4, pp. 506-510
Abstract - Harmonic
currents introduced in the utility power supplies induce a poor factor
several and distorted current waveform. Thus standards and
recommendations increases the attention in power factor correction. For
low power applications, this paper presents a sliding mode control
proposed for power factor correction. It’s applied with success to a
Boost converter operating in continuous conduction mode and its
efficiency tested through simulations and its robustness was proven.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Power Factor Correction (PFC), Total Harmonic Distortion (THD), Boost converter, Sliding Mode Control (SMC).
Control
of Harmonics in Electric Traction System
by Vasanthi
V, Ashok S
Vol. 5. n. 4, pp. 511-515
Abstract - This
paper investigates the presence of harmonics injected by the electric
locomotive into the electric traction system. For analysis, rectifier
controlled locomotive is modeled in MATLAB-Simulink toolbox.
Measurements are taken from a traction substation and the model is
validated. The simulation as well as measured results shows a high value
of current harmonics and total harmonic distortion. A passive filter is
designed to control the current harmonics and total harmonic distortion
within the standard limit which also improves the power factor.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Traction Substation, Electric Locomotive, Total Harmonic Distortion, Power Factor, Passive Filter.
Twelve
Sector Methodology for Direct Torque Control of Induction Motor with Fuzzy Logic
by M.
Banuchandar, V. Adwaith, M. Senthilkumaran, Dr.Ranganath Muthu
Vol. 5. n. 4, pp. 516-523
Abstract - Direct
Torque Control (DTC) is a technique for speed control of the induction
motor drive. Among the various control techniques available, DTC is
characterized by the absence of coordinate transformations, current
regulators and PWM signal generators. Though its design is very simple,
it provides a good torque control. However, the hysteresis band
introduces ripples in torque and flux. In this paper, an improved DTC
technique using extra vectors that aims at reducing the torque ripple is
presented. The time for which the vectors are applied is calculated
using a fuzzy based duty ratio controller. Simulation is carried out in
Matlab/ Simulink. Results obtained from this technique are compared with
those obtained from classical DTC technique.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Direct Torque Control, Fuzzy Logic, Twelve Sector, Space Vector, Inverter.
Airbots
Team Control
by Alexandra
Šlezárová, Igor Hantuch, Ľubomír Čapucha, Martin Foltin
Vol. 5. n. 4, pp. 524-530
Abstract - The
article deals with the issue of collective behavior of Airbot team.
Airbot is unmanned aerial vehicle in virtual reality. The control system
is based on “collective consciousness”. The collective behavior is
realized by sharing information, writing, sending and reading the data.
The article includes design and implementation of program model, which
was used for demonstration of Airbot behavior in case of obstacle
identification. The solutions were experimental verified in virtual
reality.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Airbot, Collective Consciousness, Behavior, Mission, Coordinate, Cooperation, Sharing Information.
Modified
Smith Predictor for the Control of Unstable Non-Minimum-Phase Delayed Systems
by Shyma
Muhammed, Abraham T Mathew
Vol. 5. n. 4, pp. 531-538
Abstract - Control
of time delay systems has been a challenging problem for the control
engineers. The issues have been inviting attention of many researchers,
especially in the context of robust control. This is further motivated
by the fact that many processes have the time delay present in the
corresponding models and thus the design of controller becomes
computationally rather involved. It is known that, in general, the
delays appear in the system models due to various factors like transport
phenomena, computational time needed for generation of control command,
time delay in the smart measurement devices, approximation of a higher
order system with a lower order model etc. The control of systems with
delays, especially those with stable/unstable and
minimum/non-minimum-phase characteristics is to be treated separately.
Most of the existing solutions do not cover all the situations and, in
any case, they lead to complex controllers. Simple controllers that are
easy to design and tune are very important in the process industry. In
this paper some control schemes based on a new but very simple strategy
that uses Smith Predictor are presented.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Non-Minimum-Phase Systems, Smith Predictor, Unstable Time-Delay Systems.
Elimination
of Flicker, Harmonic and Voltage Drops by Modelling and Simulation of Power
Electronic Device
by
S.R. Mousavi, P. Amiri, R.
Ghandehari, J. Sadoughi
Vol. 5. n. 4, pp. 539-547
Abstract - This
paper reviews the results of using fundamental power electronics devices
which use to eliminate the events of power quality. The term "Customized
power" usually used to describe an advanced technology which applied to
an application system in order to improve the given power quality to
final customers. In this paper, two devices for eliminating break times
and voltage drops, some devices for compensating imbalance, flicker and
harmonic are introduced. In order to eliminate the harmonic, new
connection for a unified power quality conditioner (UPQC) that improves
the power quality of two feeders in a distribution system is proposed.
Also in this paper, new idea as interline unified power quality
conditioner (IUPQC) with its structure, control and capability of the
IUPQC is discussed. The efficiency of the proposed configuration and
total harmonic distortion (THD) currents has been confirmed through
simulation studies using MATLAB Simulink. The main purpose is verifying
the usage of average voltage. It is demonstrated in most cases that the
customized power devices have higher efficiency than the traditional
elimination methods. However, the most suitable solutions are related
with the source characteristics in the optimum point of requirement of
consumption and economics.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Power Electronic Devices, Simulation and Modeling by MATLAB, Unified Power Quality Conditioner, Harmonic Elimination, Flicker Elimination.
Analysis and Control Towards Limb Prosthesis for Paraplegic and Fatigued Conditions by Introducing Lyapunov and Sample Data Domain Aspects
by
Biswarup Neogi, Soumya Ghosal, Sayantan Sarkar
Vol. 5. n. 4, pp. 548-552
Abstract - The paper is based on the phenomenon of advanced control and stability analysis for paraplegia and fatigued conditions of prosthetic limb. The ever growing research on prosthetic limb has drawn researchers’ interest from time and lot of researches have been carried out till recent days. This paper mainly emphasizes advanced and efficient stability analysis techniques for the two different states of prosthetic limb. The paper introduces the control representation for two different states of the limb. Lyapunov stability representation has been shown for open loop transfer functions for paraplegic and fatigue condition. The controller design is shown in the next part as well as tuned transfer functions are generated. Finally, Sample data control representation has been carried out to initiate the non- deterministic control approach for paraplegic and fatigue conditions of prosthetic limb.
Copyright © 2012 Praise Worthy Prize S.r.l. -
All rights reserved
Keywords: Prosthetic Limb Control, Lyapunov Control, Sample Data Control Representation, Paraplegic and Fatigued Condition, Step Response.
