EPE Journal Volume 18-4 
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EPE Journal Volume 18-4 - Editorial
EPE Journal Volume 18-4 - Papers
EPE Journal Volume 18-4 - Reports



 EPE Journal Volume 18-4 - Editorial 

Looking forward to 2009  [Details]
By B. Sneyers

"Looking forward to 2009", the editorial of EPE Journal Volume 18-4, October - December 2008, written by Brigitte Sneyers, Secretary General.


 EPE Journal Volume 18-4 - Papers 

A novel 60 MW Pulsed Power System based on Capacitive Energy Storage for Particle Accelerators  [Details]
By C. Fahrni; A. Rufer; F. Bordry; JP. Burnet

Large physics experimentation as in particle accelerators or in nuclear fusion is often characterised by a strong and modulated power demand, incompatible with the power availability of the grid. Therefore, large facilities for short-term energy storage have been used, traditionally based on rotating machines. Several new solutions of power supply are studied and especially a new solution for energy storage is presented, where capacitors are used as energy storage elements. They are integrated in the static power converter.
The energy- and instantaneous power-demand are presented, and then the global storage system with a dedicated multilevel DC/DC converter with flying capacitors is described. A specific control strategy for voltage balance, together with an adapted loss compensation method is also introduced and developed.

Modeling and Control Characteristics of Isolated Inverse-SEPIC  [Details]
By Han-Eol Park; Eun-Seok Kim; Joong-Ho Song

A dynamic model for II-SEPIC (Isolated Inverse-SEPIC) is developed based on the state-space averaging method and its control characteristics are investigated in this paper. Equations for the circuit design of II-SEPIC are derived through the steady state analysis and the resulting circuit parameters are used in the consequent simulation and experiment works. A structure of control system is devised to obtain a better control performance. In order to verify validity and effectiveness of the design equations and the dynamic model, dynamic performances of II-SEPIC system against the line and load variations are investigated in both simulation and experiment. Validity of this paper is also confirmed through the fact that the results obtained from simulation show relatively good coincidence with those from experiment.

Flyback Topology with Charge-Pump Gate Driver for Plasma Display Panel  [Details]
By Jun-Young Lee; Jong-Sun Ko

A low cost PDP sustain power supply is studied based on flyback topology using Boundary Conduction Mode(BCM). This method guarantees the line current harmonic regulation under all load conditions and an excessive link voltage stress problem, that is serious in general single-stage topologies, can be removed because flyback topology does not use the link capacitor. Also, charge-pump switch driver has been developed to reduce the turn-off switching loss. Using the charge-pumping circuit and bias-stabilizing resistor, stable negative driving pulses can be obtained to improve the turn-off transition characteristic in spite of wide duty ratio changes. The proposed converter is tested with a 300 W(200 V - 1.5 A output) prototype circuit and the efficiency of 88.6 % can be obtained.

Fully Digital Control of Multilevel Cascade Inverter with Variable DC Voltage Sources  [Details]
By Chih-Chiang Hua; Chun-Wei Wu; Chih-Wei Chuang

Cascaded multilevel inverters have been widely applied for the applications of high voltage and high power systems. The input power sources for a cascaded multilevel inverter requires separate dc voltage sources, and available dc sources include batteries, photovoltaic arrays and fuel cells…etc. If variations or fluctuations occur at the input voltage, the harmonic distortion of the inverter output voltage will increase. The conducting angles of switches in the conventional cascaded multilevel inverters are obtained by the use of Fourier series to minimize the harmonic distortion of output voltage. The traditional method is complex and difficult to implement on a single chip, especially when the input voltage sources can not remain constant and stable. A switching control algorithm is proposed for cascaded multilevel inverter with variable dc voltage sources. The proposed control combines the output voltage feedback and the input voltage feed-forward method to achieve dynamic control and low distortion of the inverter output voltage. Analysis, simulations and experimental results are presented to demonstrate the superiority of the proposed system.

Indirect Maximum Torque per Ampere Control of Induction Motor Drives  [Details]
By Mario Cacciato; Alfio Consoli; Giuseppe Scarcella; Giacomo Scelba

A novel control technique is proposed aimed to efficiency optimization in scalar controlled induction motor drives. The proposed approach consists in modulating the value of the magnetizing flux according to the load. Differently from other optimization methods, the proposed approach is based on a constant-optimal slip control, and then the model of the machine is not required to evaluate the power losses, simplifying the implementation and reducing the inaccuracy due to imperfect tuning of the motor parameters. The algorithm is based on an intuitive adaptation of the well known Maximum Torque per Ampere (MTA) control into a proper scalar control scheme able to ensure a constant-optimal slip value for efficiency optimization. The proposed control scheme is implemented using the same hardware resources as those required by conventional constant V/f or slip control implementation. An experimental evaluation has been accomplished on a 5 Hp induction motor drive in order to evaluate the efficiency improvement and dynamic response of the proposed method.

Methods of Configuring and Managing Super Capacitor Energy Storage as Peak Power Unit  [Details]
By Yonghua Cheng; Joeri Van Mierlo; Philippe Lataire

In order to use super capacitor energy storage efficiently and safely, methods of configuring and managing such energy storages are developed and presented in this paper. First, the power profile of energy storage in a dedicated passenger car during the Worst-Case speed cycle is applied as the input for the configuration of super capacitor energy storage. Then this configuration is evaluated, with respect to voltage variation and maximal charging/discharging current. Further, the methods of tracing the parameters and of identifying and balancing the voltage difference of super capacitors are developed in a management system to determine and limit the influence of voltage difference of each super capacitor on the energy capacity. These methods can ensure the super capacitor energy storage as a peak power unit having enough energy capacity until the end of its lifetime (70 % rated capacitance and 150 % series resistance).


 EPE Journal Volume 18-4 - Reports 

Second IEEE Workshop Sensorless Control of Electrical Drives  [Details]
By IEEE-PELS-Technical Committee for Motor Drives

Report on the Second IEEE Workshop Sensorless Control of Electrical Drives, Organized by IEEE-PELS-Technical Committee for Motor Drives, Joint IES/PELS Chapter of Poland Section IEEE, In Warsaw on the 29.08.2008.
Location: Warsaw University of Technology, Institute of Control and Industrial Electronics
Co-Chairs: Prof. Alfio Consoli, Italy and Prof. Ralph Kennel, Germany Local Organizers: Prof. Marian P. Kazmierkowski, Poland and IES/PELS Chapter Chairman: Dr Marek Jasinski