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EPE Journal Volume 20-2 - Papers
- Dynamic properties of PCM-controlled superbuck converter – Discrete vs. coupled inductor implementation
- A Novel DC/DC Converter Resonant Architecture for Traction Power Supplies
- Analytical Model for Determination of Steady State Performance of Permanent Magnet Brushless DC Motor Drive
- Novel Multiple DC-inputs Direct Electric-Power Converter
- Electromechanical Modelling and Control of a Micro-Wind Generation System for Isolated Low Power DC Micro Grids
- Control and Performance of Shunt Current Source Active Power Filter with Series Capacitor
- Grid Sequence Detector Based on a Stationary Reference Frame
EPE Journal Volume 20-2 - Editorial
By Pat Wheeler; Phil Mawby; Colin Oates
The editorial of EPE Journal 20-2, "EPE'11: Welcome to Birmingham", written by Pat Wheeler, Phil Mawby and Colin Oates.
EPE Journal Volume 20-2 - Papers
By Juha Huusari; Jari Leppäaho; Teuvo Suntio
Fourth-order converter known as superbuck converter is used in the applications requiring continuous input current such as interfacing solar generators or improving power factor of a converter. Peak-current-mode control is used to reduce the resonant behaviour of the converter for facilitating the control design. The input-current ripple can be reduced substantially by applying coupled-inductor technique. The paper investigates the dynamic effects the application of the coupled-inductor technique causes in a superbuck converter. The dynamic features of the higher-order converters are usually not well known due to the complexity of the analysis. The coupled-inductor technique further increases the complexity and therefore, its real dynamic effects are not properly analyzed. The investigations show that the peak-current-mode-controlled superbuck converter with coupled inductors will become almost useless even if the original converter has features resembling that of an optimal converter. Experimental evidence is provided to validate the theoretical findings.
By Antonio Coccia; Francisco Canales; Peter M. Barbosa
A novel method to reduce the effect of wide input voltage variation in soft-switched DC/DC converters for high-power and high-voltage traction applications is presented in this paper. To enhance high conversion efficiency together with high reliability and cost reduction, the document addresses the use of a power architecture whose front-end is a threelevel half-bridge converter in differential configuration. Thanks to a structured control methodology based on the possibility to use either a two-level or a three-level modulation strategy according to the input voltage level, it is possible to optimize the converter performance over the whole input voltage range.
First, the soft-switching implementation of the converter which allows ZVS (Zero Voltage Switching) operation in the entire load range by using the magnetizing inductance of the transformer is discussed. Then, the operation of the converter at both two-level and three-level operation is addressed. Concluding, experimental results obtained in the specified input voltage range are presented to confirm the validity of the theoretical analysis.
By Praveen Kumar, Pavol Bauer
An analytical model to evaluate steady state performance of electronically commuted permanent magnet brushless DC motor is presented. The presented model is valid for any shape of back emf and for both 120° and 180° modes of inverter operation. This model provides a rapid means of determining the drive performance in the initial design stages. The developed model is verified by two different motors.
By K. Yoshimoto; K. Maikawa; S. Satou
A new multiple DC-inputs direct electric-power converter (D-EPC) has been developed. It is placed between multiple dc power sources and an AC motor, eliminating the need for a DC/DC converter generally used in conventional converter/inverter systems. D-PEC can improve the efficiency of the motor drive system with a more compact size. Its power distribution control is carried out by allotting voltage ratios to each of two different DC power sources on a time average basis. A new pulse width modulation (PWM) generation technique to drive switching devices in D-EPC has also been developed. Tests have verified that the three-phase AC motor can be operated by controlling the power distribution between the two power sources.
By Alba Colet-Subirachs; Oriol Gomis-Bellmunt; Daniel Clos-Costa; Guillermo Martín-Segura; Adrià Junyent-Ferre; Roberto Villafáfila-Robles; Laia Ferrer-Marti
This paper describes the modelling and control of a micro-wind generation system, based on an axial flux permanent magnet synchronous generator (PMSG), for isolated low power DC micro grids. The system consists of a micro-wind turbine including a furling tail, a PMSG, a three phase diode rectifier and a buck converter connected to a battery bank and a load. Furthermore, it incorporates a control system to extract the maximum power output from the wind turbine using the minimum possible number of sensors. The system is simulated in Matlab/Simulink to analyze the dynamical response and it is compared with the current IT-PE-100.
By Perttu Parkatti; Mika Salo; Heikki Tuusa
This paper presents in detail the operational principle, theory, control and experimental results of a shunt current source active filter with series capacitor. With the proposed topology the voltage stresses and power losses of the conventional current source active power filter (CSAF) can be reduced. The proposed topology is based on the series capacitor structure used to block the fundamental supply voltage component. Moreover, computational capacitor voltage balancing is studied to compensate the effects of the asymmetry. The control system is realized using a Motorola MPC563 microcontroller. The results show that the voltage stresses of the power switches are low and the efficiency of the overall system is high.
By Eider Robles; Salvador Ceballos; Igor Gabiola; Maider Santos; Josep Pou
This paper proposes a new three-phase positive sequence detector. The structure is based on a stationary reference frame and a Moving Average Filter (MAF) that guarantees the complete cancellation of harmonics and grid imbalances. Performance of the MAF is analyzed mathematically for a proper selection of the window width of the optimal filter in this application. The time delay introduced by MAFs is constant and known; hence, it can be compensated. Furthermore, it completely eliminates any oscillation multiple of the frequency for what it is designed; The proposed detector operates in open loop and there is no PI controller to be tuned. Thus, the dynamic response and simplicity is improved compared to other solutions. Performance of the proposed detector is verified through simulation and experiment. It shows very good performance under extreme grid voltage conditions, allowing fast detection of the grid voltage positive sequence (within one grid voltage cycle).