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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Power Electronics
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The Korean Institute of Power Electronics
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Volume & Issues
Volume 2, Issue 4 - Dec 1997
Volume 2, Issue 3 - Sep 1997
Volume 2, Issue 2 - Jun 1997
Volume 2, Issue 1 - Mar 1997
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Multivariable State Feedback Control for Three-Phase Power Conversion systems
The Transactions of the Korean Institute of Power Electronics, volume 2, issue 1, 1997, Pages 1~11
In this paper, a novel multivariable state feedback control with feedforward control is proposed to improve control performance of power conversion systems. The targets of the application are three-phase voltage-source PWM converter and inverter system, and current-source PWM converter and inverter system, of which equivalent circuits and models are derived and analyzed. Various simulation results are presented to verify the validity of the proposed scheme.
Advanced High Frequency AC Propulsion System for Next Generation Electric Hybrid Vehicle
The Transactions of the Korean Institute of Power Electronics, volume 2, issue 1, 1997, Pages 12~25
Seok-Gyu oh Chinju Nat`l Univ., chinju Korea
The Transactions of the Korean Institute of Power Electronics, volume 2, issue 1, 1997, Pages 19~24
The torque of SRM depends on a phase current and the inductance of the motor. But the inductance is saturated nonlinearly according to the position and current. To drive the motor effectively, the control scheme should take into account the nonlinear characteristics of the magnetic material. This paper proposes an optimal control scheme for high efficiency drive of SRM by adjusting both the turn-on and turn-off angle. The high efficiency drive points are simulated and searched by using GA-Neural Network The switching angles are nonlinearly varied with rotor speed and load.
Analysis of Dynamic Characteristics for High speed Plunger-type Solenoid
The Transactions of the Korean Institute of Power Electronics, volume 2, issue 1, 1997, Pages 26~32
In this paper, numerical analysis of dynamic characteristics for the plunger-type solenoid was used for a high speed solenoid valve with fast switching is discussed. The theoretic analysis of the electromagnetic field including eddy currents in the solenoid is studied by using permeance. The optimum value of design parameters which are a mass and an area of the plunger, a source voltage, a elastic modulus of the spring, a stroke, a number of turns, are obtained by the results of the investigation on effect of a parameter on others. And dynamic characteristics of acting solenoid that is the variation of magnetic force, displacement, solenoid current are investigated.
High Power Factor Converter for Electric Vehicle Chargers
The Transactions of the Korean Institute of Power Electronics, volume 2, issue 1, 1997, Pages 33~38
Generally, various semiconductor switching devices for power systems are used in battery chargers for electric vehicle. When these used, it takes the problems of transient-current or distortion of waveforms in power systems near by battery chargers because of harmonics and large peak-current, low power factor, etc., caused by the non-linearity of these devices. Recently, power factor control, line current peak-cut, harmonics reduction which was ignored in past is more and more important. In this paper, to solve those problems we will improve the characteristics of voltage rising and propose the high power factor converter circuit for battery chargers. Our proposed system convert commutated voltage to AC resonant wave in high frequency inverter and rectify the link voltages passed high-frequency transformer and transfer the DC voltages. Especially, the effect using these converter system can be improved very large by power factor control and we have to verify the possibilities of improvement through the experiment of Pb-Acid battery application.
Design of Neural Network Controllers for High Speed Induction Motor Drives
The Transactions of the Korean Institute of Power Electronics, volume 2, issue 1, 1997, Pages 39~45
In this paper, a high speed motor drive system using an indirect adaptive neural network controller is proposed. In the variable high speed motor drives, the speed response can be deteriorated by long settling time and high overshoot. To obtain a good dynamical performance, an adaptive feedforward controller consisted of Neural Network Controller(NNC) and Neural Network Emulator(NNE) is applied. The NNE is used to identify the parameters and characteristics of high speed motor. To train the controller, the weights are dynamically adjusted using the back propagation algorithm. Computer simulation and implementation of the proposed system is described.