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This paper deals with the synthesis of an RL Cauer ladder network to homogenize multiturn windings in time‐domain finite element (FE) computations. In frequency domain, the macroscopic model of eddy currents in the winding can be described by frequency‐dependent complex impedance and reluctivity for skin and proximity effects respectively. To represent those in time domain, two RL Cauer networks are...
This paper presents the systematic design and performance of two controls for half-bridge converters with LCL output filters based on a similarity transformation. This type of converters is commonly used in, for example, grid or battery interfaces. Both controls feature active damping, i.e. filter resonances are damped through software and not by using passive resistors. Moreover, both controls are...
This paper presents a scalable synchronous buck converter design. Innovation lies with the design method and control algorithms. Firmware makes the converter's half-bridges switch as to emulate a resistively terminated ladder network. This actively damps filter resonances and prevents circulating currents when multiple converters operate in parallel.
This paper deals with a time-domain homogenization technique for litz-wire bundles embedded in a finite element (FE) model. An elementary FE model is used to determine dimensionless frequency- and time-domain coefficients regarding the skin and proximity effects in litz-wire bundles. Thanks to these coefficients, litz-wire bundles become homogeneous conductors which are easy to integrate into a FE...
This work deals with a frequency-domain homogenization technique for litz-wire bundles in transformers. The approach consists in adopting a frequency-dependent complex reluctivity in the litz-wire bundles and a frequency-dependent complex impedance in the electrical circuit. The litz-wire bundles become homogeneous conductors which are easy to integrate into a finite element model of a transformer...
This paper deals with the losses of Switched Reluctance Machine Drives (SRDs) for electric vehicle propulsion, consisting of the losses in the Switched Reluctance Machine (SRM) and the converter, across some operating regions based on different control strategies, namely Firing Angle (FA) control and Torque Sharing Function (TSF) control. The SRM model which takes into account copper losses and converter...
To reduce the increase in switching losses caused by PWM operations at both the input and output stages of three-level back-to-back (3L-BTB) converters, three novel topologies of 3L-BTB converters together with a new modulation strategy are developed based on the matrix converter theory. The proposed BTB converters are comprised of a fundamental-frequency switching rectifier and a PWM inverter. The...
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