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With an increase in the wind turbine ratings, power converter ratings increase as well, thus raising the interest in medium voltage power converters. Switching frequency in said converters has to be kept below 1 kHz; hence the sampling frequency, which normally nowadays equals twice the switching frequency, is low as well. Sampling at low rates introduces additional non-idealities in the control of...
The paper presents a review of techniques for arbitrary power and current sharing between winding sets of a multiphase machine. This feature of a multi-star machine can be utilised for different purposes, such as fault-tolerant operation, increase of the total dc-link voltage by cascading multiple inverters, creation of dc voltages of different levels, or implementation of an arbitrary power flow...
Standard modelling approaches for a triple three-phase (i.e. nine-phase) machine include vector space decomposition (VSD) and triple d-q modelling procedure. Each is characterised with certain benefits and shortcomings. This paper introduces a novel transformation, applicable to multiple three-phase winding machines in general, especially aimed at facilitating the power (current) sharing between the...
With currently available power electronic devices, the power range of a single three-phase power converter is limited well below the power ratings foreseen for remote offshore wind turbines. A solution is to use multiphase systems. By connecting each of the converters to one three-phase winding in the stator of the machine, a multiphase conversion system is obtained allowing to exploit its fault tolerance...
The prevalence and associated health cost of asthma have been increasing in developed countries, and 70% of the overall disease cost is due to exacerbations. The primary objective of this study was to determine the hospital cost of an asthma exacerbation in Spain. The secondary objective was to determine what maintenance treatments patients were using to control asthma before the exacerbation and...
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