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This paper presents two links between wind turbine (WT) functional quantities. The first connection is the dependence of the mechanical angular velocity (MAV), corresponding to maximum power point (MPP), labeled as ωOPTIM from the maximum MAV, labeled as ωMAX, at no load operation. In this paper, it is shown that this report for a given WT-PMSG has a constant value and it does not depend on wind speed...
Efficiency improving methods, while maintaining the unity power factor, represent a major research topic in the PFC rectifiers' area. This paper introduces three novel highly efficient three-phase interleaved buck-type unity power factor rectifiers, namely the interleaved six-switch, the interleaved swiss and the interleaved eight-switch topologies. Compared to the switching strategy of the single-stage...
One major research topic in the PFC rectifiers area is represented by efficiency improving methods, while maintaining the unity power factor. In this paper, the single stage PFC rectifiers, namely the SWISS and 8-switch topologies, are investigated. New control strategy for the 8-switch rectifier proposed in [7] is introduced. Further, an interleaved switching strategy that enables cancellation of...
One major research topic in the PFC rectifiers area is represented by efficiency improving methods, while maintaining the unity power factor. The investigated topologies in this paper are the single stage versus interleaved eight-switch rectifiers topologies with or without considering the DC-link diodes. For the eight-switch rectifier a new control strategy is proposed in [8]. The proposed interleaved...
An increased research effort on the topic of unity-power-factor rectifiers has been lately noticed. In this paper two highly efficient three-phase buck-type unity power factor rectifiers are proposed to be studied: the conventional six-switch (single-stage) and its two-stage version, referred as the interleaved six-switch solution. They are in here compared in terms of efficiency and performances...
In this paper, we present a method for controlling a wind system consisting in a wind turbine (WT) and a permanent magnet synchronous generator (PMSG) so as to achieve the operation in the optimum energy efficient zone at time-varying speeds of wind. It analyzes the operation of a WT in the maximum power zone by changing the generator load, while the wind speed varies significantly over time. The...
In the last two decades, a great part of research in the power electronics area has been involved in finding methods of improving the input current waveform while simultaneously avoiding phase displacement. The aim of the paper consists of selecting two of the most relevant single phase power factor correction (PFC) topologies currently existing for the power range of 1.5 kW up to 4 kW and to analyse...
The main drawback related to the PFC converters is the increasing of the electromagnetic interference (EMI). Thus, the high frequency noise must be filter out in order to ensure compliance with EMI European standards (EN 1000-3-2 or EN 1000-3-4). The paper investigates two topologies: the conventional boost PFC converter and the bridgeless boost PFC converter. A proper filter is designed and its details...
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