R. W. De Doncker

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The authors present three DC/DC converter topologies suitable for high-power-density high-power applications. All three circuits operate in a soft-switched manner, making possible a reduction in device switching losses and an increase in switching frequency. The three-phase dual-bridge converter proposed is seen to have the most favorable characteristics.(More)
This paper presents a new approach of modeling the dynamic behavior of supercapacitors using impedance spectroscopy. The new Matlab/Simulink model can be used in simulating the voltage response and energy efficiency, e.g. for automotive power systems. The model in the frequency domain, the parameter calculation as well as the inverse transformation into the(More)
Recently, the interest in offshore wind farms has been increased significantly. Besides the huge amount of space available, they have the advantage of an increased and more constant wind speed, leading to a higher and more constant production of power. Although, a lot of mechanical problems for constructing these farms have been solved during the past(More)
The development of advanced transmission and distribution technologies is steadily gaining interest. Especially the large number of wind farms leads to a demand for new and innovative solutions. Considering the interconnection of offshore wind farms, new technologies must be investigated. One promising solution for an interconnection is a DC distribution(More)
The auxiliary resonant commutated pole (ARCP), a new power converter topology that fully achieves soft switching without increasing primary device voltage or current ratings, is discussed. The ARCP converter is capable of true pulse-width modulation (PWM) control of each phase. The power circuit relies on the addition of an auxiliary triggered resonant(More)
Supercapacitors, also known as ultracapacitors or electric double-layer capacitors (ELDCs), are electrical energy storage devices, which offer high power density, extremely high cycling capability, and mechanical robustness. Due to their electrical performance, supercapacitors have a high potential to be used in industrial applications. To improve the(More)
The synthesis of a universal field-oriented (UFO) controller is presented. The UFO is capable of decoupling flux and torque in an arbitrary reference frame. Due to its high degree of generality, it is fully compatible with all existing field-oriented controllers, indirect as well as direct. As a consequence, the digital integration of the UFO scheme in all(More)
This paper presents a concept for active damping of an LCL filter connecting a digitally controlled PWM converter to the grid. Active damping is performed by means of a digital Infinite Impulse Response (IIR) filter. Digital filters, being well known in digital signal analysis, can easily be implemented when using digital controllers and require very low(More)
The behavior of a director stator-flux-oriented (SFO) system in the field weakening region is studied and compared with that of a direct rotor-flux-oriented (RFO) system. The steady-state analysis shows that the SFO system always retains maximum torque capability, not matter how large the error in the parameters. In contrast, RFO is sensitive to variations(More)
For grid connection of high-speed gas-turbines, converters can be used to eliminate the otherwise mandatory gearbox. Compared to standard drives, different requirements are imposed on the converter. In this paper, the application of different converter types for a typical gas-turbine generator system are investigated. After selecting suitable topologies and(More)