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A direct extraction method for small signal parameter extraction of a linear circuit is presented. Unlike the numerical method approach, this algorithm doesn't make use of "start values" and performs complex symbolic computation in conjunction with numeric subroutines. Extraction of small signal parameters of a particular circuit illustrates the viability of the method and evidences the...
The paper presents some research efforts regarding the modeling, numerical simulation and experimental research of embryonic systems with the purpose to design and to implement digital systems with abilities of biological organism. From theoretical point of view, concepts from cellular embryology are used for VLSI digital systems design and development. The study is focused in founding researches...
Software reliability is the most important measure of software quality and, naturally, should be customer- oriented. In the current article, a reliability study related to the software exploitation behavior for the remote control of the GVR (gas vacuum recloser) reclosers, using the homogeneous Poisson method, is going to be examined.
In applications such as vibration isolation, gravity compensation, pick and place machines, etc., the applicability of commercial low force passive devices is limited and hence would benefit from an improved and preferably variable force level. This paper presents and investigates such a long stroke constant-force versus displacement actuator topology, where analytical and equivalent circuit models...
Optimal load-shedding during contingency situations is one of the most important issues in planning, security, and operation of power systems. Load-shedding is necessary to prevent phenomena such as voltage collapse and line over load which may lead to cascade outages and then black-out. In this paper, a new optimal load-shedding approach is presented. One of the important specifications of this method...
In the Synchronous Generator (SG)+Asynchronous Generator (AG)+Load (L) system there are, for certain load values, one or three working points. In this paper, we present the correct assessment of the working point with a view to building a mathematical model of generators valid both in stationary and transitory regimes. Numerical simulations and modelling of a stand-alone electric power system has...
Intelligent techniques are present in an increasing number of applications related to the electrical power systems (EPS), due to its ability in dealing with complex and nonlinear problems. Amongst these problems is the voltage control of the Brazilian EPS, which is currently based on the experience of real time operators. With the objective of developing a decision support system capable of assisting...
Optimal load-shedding during contingency situations is one of the most important issues in planning, security, and operation of power systems. Load-shedding is necessary to prevent phenomena such as voltage collapse and line over load which may lead to cascade outages and then black-out In this paper, a new optimal load-shedding approach is presented. One of the important specifications of this method...
To study the angular stability in a network of parallel connected synchronous machines, all system components which effect on the transient behaviour of the whole system have to be taken into account. This article investigates the possibility of starting up of the loaded synchronous motor in case of using three parallel-connected salient-pole machines feeding the asynchronous motor. A detailed model...
The paper presents a new predictive algorithm for the control and protection of electric power networks that will be implemented In switching power equipment for hazardous areas in potentially explosive atmosphere. Simulated model using HPVEE Pro6 software and microcontroller CY8C29466 hardware Implementation were designed to work with the predictive algorithm.
In this paper authors propose a rapid and new method to design and optimize the electric motor control using field programmable gate array (FPGA). The elaborated designing algorithm takes advantage of the unification of ISE Xilinx digital designing environment with Matlab/Simulink simulation and testing environment, through system generator toolbox. This results in a faster and efficient design flow...
This paper presents a speed control scheme of the switched reluctance motor (SRM) using a fuzzy logic controller (FLC). The fuzzy logic speed controller is employed in the outer loop. The performances of the proposed FLC based SRM drive is investigated experimentally at different dynamic operating conditions such as a change in the load under soft chopping mode with different rule bases.
Sawing with circular saw is not possible to realize with optimal cutting parameters because the continuing variation of contact lengths of wing chord between cutting tool and the material. On coming in and coming out of teeth's in material appear the possibility to break off this teeth's, but in the middle of cutting this possibility is decrease because are much more teeth's in contact. So the optimal...
In this paper an approach to the detection of unknown objects is presented. The proposed algorithm is applied to the rehabilitation robot FRIEND II for the localization of objects situated in complex scenes. Also, the method was designed to cope with changes in the illumination conditions. The approach used in this work is the inclusion of feedback control in the image processing chain used by the...
The control system for position control of the drive employing PMSM based on the principles of sliding mode control and respecting the principles of vector control is presented. Designed controller is chattering free and complies with demanded control precision. Described control technique divides PMSM into two channels, which enable to control motor flux and torque separately. The controller is of...
This paper presents a wind electric conversion system composed of: permanent magnet synchronous generator, three-phase diode rectifier, DC/DC buck converter, PWM voltage inverter and transformer feeding a network. The PWM voltage inverter current controllers impose that the mains currents will have near sinusoidal waveforms with unity power factor, leading to a high quality power delivered to the...
The issue of the most cost-effective configuration of a stand-alone PV plant to meet the loads with a high confidence level, is one of prime importance. The paper describes and compares two new approaches which when combined may provide much more reliable and economic PV sizing and performance, compared with the conventional methodology. There is outlined an evolution of PV sizing methodologies with...
The paper outlines a stand alone (S.A.) PV plant of 3 kWp linked to an agro-refrigeration unit during summer period and to the loads of the solar energy laboratory the rest of the year. It also describes the procedures followed to convert it to a remotely monitored one using the Web services. The signals and data from the different elements of the PV plant are managed through MatLab software loaded...
The present paper investigates by FEM, on a case study, the gradual airgap surface PM single phase synchronous motor to obtain a good compromise between starting torque, average torque and torque ripple. Then, based on a dynamic circuit model, the torque pulsations with trapezoidal current control is explored through digital simulations with about 80%( from average rated torque) initial self-starting...
For optimal co-ordination of overcurrent (OC) relays, linear programming techniques such as simplex, two- phase simplex and dual simplex are used. Another way of optimal coordination program is using artificial intelligent system such as genetic algorithm (GA). In this paper a new approach will be used for optimal coordination of OC relays based on genetic algorithm. In this work we take into account...
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