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This paper includes a distributed control strategy for the joint control of wind turbines and a diode based HVDC link with black start capability. In spite of using a Line Commutated Rectifier, the presented technique allows for the black-start operation of the off-shore grid. Moreover, an adequate desing of wind turbine pitch and active power control… (More)
The aim of this work was to study linear deterministic models to predict tissue temperature during radiofrequency cardiac ablation (RFCA) by measuring magnitudes such as electrode temperature, power and impedance between active and dispersive electrodes. The concept involves autoregressive models with exogenous input (ARX), which is a particular case of the… (More)
Diagnosis of intermittent faults is relevant for productive processes with a high level of maintenance caused by such failures. A characterization of diagnosed faults may save unnecessary repairs and enable better maintenance planning. This paper introduces the concept of diagnosis of intermittent fault dynamics. Moreover, a methodology for modelling… (More)
Modern wind turbines allow for tight control of terminal voltage, this is particularly true for synchronous generator (SG) based wind turbines. Therefore, an integrated design of wind turbine and HVDC link control can lead to a substantial simplification of the off-shore rectifier. This paper introduces an integrated control algorithm for line commutated… (More)
This paper includes the theoretical analysis and experimental validation of a control strategy for the direct power and current control of grid-connected inverters. The studied control strategy allows for constant active and reactive power delivery during unsymmetrical faults and with supply voltage distortion, without the use of a PLL or FLL. It has been… (More)
A strategy for an indirect matrix converter with two outputs to supply energy to a vector controlled open-end winding induction machine is presented. The modulation schemes for the input and two output stages aim to reduce the virtual DC link voltage for low speed operation and eliminate the zero sequence voltage in the load.
In this paper, a control strategy intended to eliminate any DC voltage offset caused by a common-mode and zero sequence voltage reduction modulation, from the machine terminals, is presented. In order to achieve that goal, a PI resonant controller is proposed to control the machine currents. Simulation and experimental results are presented and discussed.
PURPOSE To assess whether tailoring the Kp and Ki values of a proportional-integral (PI) controller during radiofrequency (RF) cardiac ablation could be advantageous from the point of view of the dynamic behaviour of the controller, in particular, whether control action could be speeded up and larger lesions obtained. METHODS Theoretical models were built… (More)
This paper shows that it is possible to substantially reduce the rectifier capacitor and filter banks when using diode based HVDC link for the connection of large off-shore wind farms. The considered wind turbines are based on full power power converters. The paper includes a control strategy that allows the wind turbine front-end converters to control the… (More)