N. Abut

Kocaeli University, Cocaeli, Kocaeli, Turkey

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Publications (8)0 Total impact

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    ABSTRACT: In this study, a fast simulation technique is proposed for the analysis of power electronic circuits. After switching, these circuits behave like a linear circuit. Therefore, linear circuit analysis methods can be used. In the simulation, capacitors and inductors are replaced by voltage and current sources respectively, whose values are determined by their current and voltages in the previous step. The method is based on solving a system of algebraically modified nodal equations at each integration step. The technique requires only DC analysis. The writing or solving of time-differential equations or Laplace transform inverses are not required. Thus, the simulation is fast and the simulation time is essentially the same as for a linear, time-invariant circuit of the same complexity. A simulation algorithm is given and an example is included
    Applied Power Electronics Conference and Exposition, 1999. APEC '99. Fourteenth Annual; 04/1999
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    ABSTRACT: In this paper, the authors propose a new control method of a separately excited DC traction motor using fuzzy logic. The design of a fuzzy logic controller for a DC motor drive, which produces the traction moment, is illustrated and implemented. The drive system has been simulated and results have been compared with those obtained by a conventional PID controller. The superior results in the drive performance, which are achieved by fuzzy logic controller, are provided. The proposed controller exhibits superior transient and steady state performance compared to the usual PID controllers
    Applied Power Electronics Conference and Exposition, 1999. APEC '99. Fourteenth Annual; 04/1999
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    ABSTRACT: An efficient method for the simulation of switched-mode converters is presented in this paper. The concept of the method is to model each semiconductor device by a nonideal equivalent circuit and to use a systematic method in obtaining the circuit equations that describe the dynamic of power electronic circuit. The switching devices permit development of a special purpose power electronic simulation algorithm because they operate in a switched-mode. To obtain a more accurate switch model for simulation, both the static and dynamic properties of switches are taken into account. Since the passive modelling elements such as resistors and inductors are constant, the system matrix is constant regardless of the states of the switches. The linearized switch characteristic is obtained by arranging the value of the current source in the model. The dimensions of circuit equations, which are obtained by using modified nodal analysis, are reduced to the minimal one by an elimination method. Thus the analysis method becomes fast. The results obtained for a typical switched-mode converter confirm the efficiency and accuracy of the analysis method
    Electrotechnical Conference, 1998. MELECON 98., 9th Mediterranean; 06/1998
  • A.B. Yildiz, N. Abut
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    ABSTRACT: An efficient approach for computer aided-analysis and modelling of power electronic circuits is presented in this paper. It uses a linearized switch characteristic and a nonideal equivalent circuit model for each semiconductor device to avoid the drawbacks of the ideal switch concept. To obtain a more accurate switch model for simulation, we use not only the linearization of characteristic of switching devices, but also we take into account their dynamic properties. The switch model consists of a current source in parallel with a resistor-inductor-voltage source series network. Since the modelling resistance and inductance in the equivalent circuit are constant, the system matrix is constant, regardless of the state of the switch. The linearized switch characteristic is obtained by arranging the value of current source in the model, during the simulation. No switching relationship between the externally and internally controlled switches is assumed. No prior knowledge of circuit operating is necessary in order to conduct the simulation. The network equations are generated by using modified nodal formulation, and thus, a reduction of circuit formulation and computing time is obtained. An example is included. The results confirmed the accuracy and generality of the method
    Applied Power Electronics Conference and Exposition, 1998. APEC '98. Conference Proceedings 1998., Thirteenth Annual; 03/1998
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    ABSTRACT: We present a simple technique to minimise torque ripple of fuzzy controlled switched reluctance (SR) motor drives in electric vehicle propulsion. Fuzzy control application of linear inductance SRM drives with the C-dump converter using an electric vehicle propulsion system is presented. The control technique is based on the control of the sum of the square of the phase currents by using fuzzy control technique. The combination of low cost, high reliability, and competitive weight and efficiency makes the fuzzy controlled SRM drive a strong candidate for application in future electric vehicle propulsion systems. The mathematical model of SRM by considering mutual inductances is obtained
    Intelligent Transportation System, 1997. ITSC '97., IEEE Conference on; 12/1997
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    ABSTRACT: In this paper, fuzzy control application of linear inductance switched reluctance motor (SRM) drives with the C-Dump power converter is presented. A mathematical model of the SRM, by considering mutual inductances, is obtained. The study aims at reducing the torque ripple and the acoustic noise and is carried out by a simulation model by using an efficient algorithm that is developed using fuzzy logic. Superior results in the drive performance are achieved by the fuzzy logic controller described. The simulated results are experimentally verified on a scaled down laboratory prototype and found to give good torque ripple and reduced acoustic noise
    Industrial Electronics, Control and Instrumentation, 1997. IECON 97. 23rd International Conference on; 12/1997
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    ABSTRACT: A control method of a separately excited DC traction motor using fuzzy logic is proposed. The design of a fuzzy logic controller for a DC-DC converter fed motor drive, that produces traction moment for a light metro vehicle, is illustrated and implemented. The drive system has been simulated and implemented using a 486 personal computer with a data acquisition card
    Intelligent Control, 1997. Proceedings of the 1997 IEEE International Symposium on; 08/1997
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    ABSTRACT: Switched reluctance motor (SRM) drives offer the advantages of simple and robust motor construction, high speeds, high overall efficiencies over a wide operating range of torque and speed, simple power converter circuits with a reduced number of switches and excellent controllability. However, the SRM also has a drawback in that it generates acoustic noise. This study aims to minimize the torque ripple of an SRM in the linear region and in the presence of mutual inductances. The proposed technique is based on the control of the sum of the square of the phase currents. The proposed control technique has been applied to an SRM and successful results have been obtained. A mathematical model of a 8/6 SRM, simulation results and the proposed method are all presented in this paper
    Industrial Electronics, 1997. ISIE '97., Proceedings of the IEEE International Symposium on; 08/1997