EPE Journal Volume 19-3 
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EPE Journal Volume 19-3 - Editorial
EPE Journal Volume 19-3 - Papers
EPE Journal Volume 19-3: Other



 EPE Journal Volume 19-3 - Editorial 

Invitation to EPE-PEMC 2010 in Ohrid, Republic of Macedonia  [Details]
By Slobodan Mircevski, Dushan Boroyevich
Invitation to EPE-PEMC 2010 in Ohrid, Republic of Macedonia, the 14th International Power Electronics and Motion Control Conference, September 6-8, 2010


 EPE Journal Volume 19-3 - Papers 

Comparison of Control Strategies for Maximizing Energy in a Supercapacitor Storage Subsystem  [Details]
By Walter Lhomme; Philippe Delarue; Alain Bouscayrol; Philippe Le Moigne; Philippe Barrade; Alfred Rufer
A storage supercapacitor subsystem is studied for insertion in a series hybrid electric vehicle (Fig. 1). This subsystem is composed of a supercapacitor bank and a braking resistor used when the supercapacitor voltage is at its maximum value. Generally, when the maximum voltage is reached by supercapacitor, a voltage drop occurs because of the current cancellation in the series resistance of the supercapacitor. Thus the stored energy is reduced compared to the maximum value that could be reached. To overcome this drawback, new control strategies are proposed by acting on the braking resistor. Energetic Macroscopic Representation (EMR) is used to organize the numerous blocks required for modelling and control. Experiment results are provided and highlight the increase of energy storage.

Statistical Approach to Robust Design of Control Schemes for Series or Parallel Connected Power Devices  [Details]
By Vivek Agarwal; D.V.M.M. Krishna
High power, high speed operation of circuits requires that devices such as IGBTs and MOSFETs be connected in series and/or parallel. Such systems are being increasingly used in high power drives, traction, active power filters and other high power industrial applications. But no matter how perfect the design and fabrication may be, no two devices can be identical, resulting in some level of incompatibility in such systems. Therefore, there is a reduction in the overall reliability unless, care is taken to optimize the parameters of their control schemes which govern the operation of such systems. This paper reports a reliability enhancement scheme for such systems. Example of series connected IGBTs using a current feedback active gate control scheme has been considered in conjunction with the Taguchi method for this purpose. The complete strategy and calculations involved are presented, as are the experimental results to validate theoretical predictions. Results show a significant improvement in performance when the control scheme parameters are optimized using the Taguchi method. A similar approach may be followed for parallel connected devices (e.g. MOSFETs connected in parallel).

Reduction of Common Mode Currents generated by Three-Level Inverters with Consideration of Motor Overvoltages  [Details]
By Arnaud Videt, Philippe Le Moigne, Nadir Idir, Philippe Baudesson, Jean-Jacques Franchaud, Jacques Ecrabey
In adjustable speed drive applications, the switching of the inverter semiconductors generates common mode currents as well as harmful overvoltages on the motor terminals when long cables are used. Consequently, bulky and expensive input and output filters must be used. This work aims at reducing these disturbances from their origin by using a three-level neutral-point-clamped (NPC) inverter controlled with a new pulse-width-modulation (PWM) strategy. Whereas previous common mode noise-reducing strategies usually generate higher overvoltages than conventional ones, the proposed PWM is able to manage both problems thanks to its internal degrees of freedom.

The Short-Circuit Input Impedance as a Main Source of Input-Filter Interactions in a Regulated Converter  [Details]
By Teuvo Suntio, Matti Karppanen
The input-filter design rules have been developed in late 1970s based on a small-signal equivalent circuit valid only for the direct-duty-ratio-controlled converters operating in continuous conduction mode. The design rules have been later generalized by applying the extra element theorem. The resulting formulation is highly theoretic and does not provide explicit formulas to solve all the required impedances. The open and closed-loop input impedances are usually considered as the base for the design. The paper shows consistently that the input-filter interactions affecting stability and the loadtransient response are, however, caused by the closed-loop and short-circuit input impedances. The importance of the short-circuit impedance is not fully recognized due to its implicit nature although it can be also physically measured. The theoretical findings are validated by comprehensive practical experiments based on the voltage-mode and peak-currentmode-controlled buck converters, which clearly point out also the physical reasons for the differences in the input-filter interactions in the voltage-mode and peak-current-mode-controlled buck converters.

Performance Characteristics of the Reduced Common Mode Voltage Near State PWM Method  [Details]
By E. Ün, A.M. Hava
The Near State PWM (NSPWM) method, which has low common mode voltage and low common mode current, is proposed for three-phase voltage source inverter drives. The method is described and its voltage linearity, output current ripple, DC bus current ripple, common mode voltage and output line-to-line pulse patterns are thoroughly studied and compared with classical PWM methods. The theory, simulation, and laboratory experiments illustrate that in the high modulation index operating range NSPWM has superior overall performance compared to other methods. NSPWM has low common mode voltage and this results in low common mode current. NSPWM has low switching losses comparable to those of DPWM methods, it has low current ripple compared to the classical methods, and it exhibits no significant overvoltage problems in long cable applications as its pulse pattern involves a sufficient distance between the polarity reversing voltage pulses.

Direct Torque Control of Synchronous Reluctance Motor using Feedback Linearization Including Saturation and Iron Losses  [Details]
By H. Abootorabi Zarchi, Gh. R. Arab Markadeh, J. Soltani
In this paper, a nonlinear controller capable of high dynamic torque regulation is introduced for Synchronous Reluctance Motor (SynRM) drive on the basis of input-output feedback linearization considering the different strategies related to this motor. The control strategies considered are: maximum torque per Ampere (MTPA), minimum KVA rating for the inverter and efficiency-optimized control. The proposed nonlinear controller is capable of regulating the motor torque by selecting the product of d and q axes torque currents as one of the output variables. As a result, the nonlinear and crosscoupling aspects between the d and q axes torque currents and the terminal currents can be eliminated. Hence, the linear torque-speed characteristics can be achieved. In addition, absolute implementation of strategies needs motor parameters with sufficient accuracy. The stator direct axis inductance (Ld) and iron loss resistance (Ri) are regarded and a PI estimator is presented to estimate the stator resistance variation. Finally, simulation and practical results are included throughout the paper to illustrate and verify the theoretical considerations.

A New Equalization Scheme for Series Connected Battery Cells  [Details]
By A. Tsapras, C. Balas, K. Kalaitzakis, J. Chatzakis
In this paper a new equalization scheme for series connected battery cells or monoblocks is presented which provides both charge and discharge equalization. The equalization scheme described in this paper provides support for the battery operation even with damaged cells, ensures a uniform battery cell voltage fall, thus protecting cells from reverse polarization, and maximizes the energy delivered by the battery (Fig. 2). An evaluation Battery Management System (BMS) was developed in the laboratory, utilizing the proposed equalization scheme, and the experimental results verify the theoretical ones.


 EPE Journal Volume 19-3: Other 

Signature of the Letter of Intent between IEEE-PELS and EPE Association  [Details]
By B. Sneyers
Signature of the Letter of Intent between IEEE-PELS and EPE Association, Barcelona, September 10th, 2009

EPE Awards Ceremony 2009 – The Gaston Maggetto Medal  [Details]
By B. Sneyers
EPE Awards Ceremony 2009 – The Gaston Maggetto Medal during the Gala evening of EPE 2009

EPE-PEMC 2010 - Call for Papers  [Details]
By B. Sneyers
EPE-PEMC 2010 - Call for Papers: The following EPE-PEMC conference will take place from 6 to 8 September 2010 in Ohrid, Macedonia.