EPE Journal Volume 15-2 
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EPE Journal Volume 15-2 - Editorial
EPE Journal Volume 15-2 - Papers



 EPE Journal Volume 15-2 - Editorial 

Invitation to EPE 2005 in Dresden (Germany)  [Details]
By Dr. L. Lorenz

Editorial of EPE Journal Volume 15-2 - Invitation to EPE 2005 in Dresden (Germany), written by Dr. Leo Lorenz, Conference Chairman of EPE 2005.


 EPE Journal Volume 15-2 - Papers 

Design and Dynamic Performance of Modified Series-Parralel Resonant Converter  [Details]
By H. M. Suryawanshi; S. S. Tanavade; M. R. Ramteke

This paper deals with modified series-parallel resonant converter (MSPRC). Leakage inductance and winding capacitance of high-frequency transformer are incorporated in the analysis of basic operation of circuit. MSPRC is well suited to high-voltage dc applications, and is operated just above the resonant frequency to maintain zero-voltage switching (ZVS). Sampled-data technique of the MSPRC is presented, and small signal modelling of the converter is obtained. Steady-state behaviour using complex ac-circuit analysis is used for design of resonant tank circuit. The magnitude of output voltage is regulated by using variable frequency control. An experimental prototype unit is developed using high frequency switches (MOSFETs). Simulation results are compared with those obtained experimentally.

Self-Sensing Active Magnetic Bearings Using a New PWM Amplifier Equipped with a Bias Voltage Source  [Details]
By T. Yoshida; Y. Kuroba; K. Ohniwa; O. Miyashita

In this paper, a self-sensing active magnetic bearing (AMB) with a new PWM amplifier is proposed. This amplifier employs two DC sources: one supplies a control current and the other supplies a bias current. A pair of electromagnets driven by this amplifier also works as a position sensor based on bridge measurement. In the experiment, a rotor running at 45,000 min-1 is suspended by the proposed 5-axis AMB without any position sensors. The experimental system is still stable even if the length of the cables between the PWM amplifiers and the electromagnets is varied within 45 meters.

A Simple Direct Torque Fuzzy Control of Induction Motor using Space Vector Modulation  [Details]
By A. El Afia; M. Khafallah; A. Chériti; B. Elmoussaoui; A. Saad

In this paper, the concept and analysis of a simple direct-torque fuzzy control (DTFC) scheme of motor induction using space vector modulation (SVM) is presented. A fuzzy logic control system is applied to obtain high performance decoupled flux and torque control. A principle and a tuning procedure of this method are discussed. The simulation results, that prove the performance of the proposed scheme as an alternative to the conventional approach, and a consideration for implementation on a DSP development system of proposed scheme, are presented.

Enhanced Locomotive Drive System Behaviour applying a Single Voltage Source Inverter Dual Induction Motor Structure  [Details]
By R. Peña-Eguiluz; M. Pietrzak-David; B. de Fornel

A special Multi-machine Multi-converter System (MMS) structure is presented in this paper. It is a mono-inverter dual motor structure specially designed to be applied in railway traction. In traction applications the necessity to provide an excellent torque response is indispensable. As a consequence, in order to control the torque production of both motors in this kind of structures, special methodologies known as co-operative control structures based in the classical Field Oriented Control (FOC) can be applied. Mono-inverter dual induction motor drive system structure enhances the locomotive behaviour, reducing undesirable effects produced by external or by internal perturbations. The obtained system behaviour is compared with the classical locomotive drive control system operation. An industrial locomotive manufacturer has confirmed the simulated model. Obtained results are applied to analyse the system behaviour of the two considered control methods, taking into account four characteristic perturbations in this kind of power traction systems.

Current Converter with Two-Loop Maximum Power Tracking Control for Solar Arrays  [Details]
By C. Hua; J. Lin

Conventional maximum power point tracking (MPPT) controllers only use one loop tracking. The fast changes of atmospheric conditions result in power loss in the tracking process. In this paper, two-loop MPPT of solar array using a current converter is presented. The solar array is treated as a current source model instead of the traditional voltage source. A current converter operating in MPPT mode under different insolations and temperatures is designed for a solar power system. The principle of energy conservation is used to develop the small-signal model and transfer function for the solar power system. Using principle of energy conservation, the drawback of state-space-averaging method can be overcome. A digital PI compensator is used to implement the proposed MPPT control in real-time, and the effect of the floating operation by the fixed-point processor is also considered. Simulations and experimental results are presented to demonstrate better performance for the proposed system.

Bond Graph Based Stability Analysis of a Railway Traction System  [Details]
By G. Gandanegara; X. Roboam; B. Sareni; G. Dauphin-Tanguy

This paper emphasises the interest of the Bond Graph approach for analysis and system design of heterogeneous and multi-field devices. In particular, the local stability analysis of non linear systems can be directly derived from the linearised Causal Bond Graph. This method is applied to a typical electrical engineering system: a railway traction device involving electromechanical couplings. Validity, usefulness and originality of this approach are displayed.