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In this paper, an optimal gate driving condition between switching loss and surge voltage is investigated by circuit simulation technique. An equivalent circuit model of power semiconductor devices, such as an IGBT and a FWD, are employed. Chip level transient switching waveforms of IGBT at different gate driving condition are calculated and evaluated with measurement results. Evaluation result shows...
In presented paper a technique for the secondary side power stabilisation for contactless energy transfer systems is presented. The original part of this approach is the position where stabilisation is performed. Instead of complicated pickup side modifications all additional circuits are located on the systems transmitting side.
We develop new power device models that express the waveforms of power devices by functions. These models are described with VHDL-AMS, which is a hardware description language. The developed model can accurately reproduce the diode recovery waveforms calculated by the TCAD model in the same time as when using the SPICE model.
Shunt active power filters (SAPF) generally compensate harmonic current of centralized non-linear loads, which may cause undesired economical burden for networks with distributed harmonic sources. This paper proposed an SAPF predictive control method based on online impedance measurement which can suppress the network-wide harmonics systematically in an optimized way.
Electric models of battery have to take into account the effect of temperature for the state-of-charge estimation. As a matter of fact, at low temperature the driving range of the vehicle can be overestimated up to more than 20% with electric only models. We propose to couple thermal and electric battery models for improving the range estimation.
In this paper, a multi-degree open-circuit faults diagnostic algorithm, for improving condition monitoring ability of spacecraft solar cell system, has been proposed. This algorithm combines the output parameter, output voltage, output current and the impedance of solar cell system under low frequency domain. The algorithm can be used to diagnose the degree of faults quantitively and quickly. The...
This paper is focused on the analysis of voltage source inverter (VSI) loss model for automotive applications. The converter is generally integrated in a thermally challenging environment and requires therefore a reliable, modular and accurate model for their evaluation. This work analyses first the current methods for the evaluation and the calculation of the losses and then present different solutions...
The article describes a feedback Preisach hysteresis model equivalent circuit implementation of a medium frequency single-phase transformer being a part of a high power and high efficiency DC-DC converter. The macroscopic models of magnetic hysteresis are introduced and the feedback Preisach model is selected for further analysis. The hysteresis model is developed for a prototype transformer and the...
This work considers the coupling effects between differential and common modes, which have an impact on the conducted electromagnetic noise generated by variable speed drive supplied from DC grid of an aircraft. Common mode noise, which origins from the differential mode, was observed during conducted EMI measurements at the output shielded cable, due to asymmetry of the cable. It is shown, that such...
The Self Turn-ON influences the turn-ON and short-circuit behaviour of the IGBT. This is a positive feedback by the IGBT on itself and increases its turn-ON speed. The strength of the effect depends on the gate structure's design. Therefore, IGBTs with different gate structures are investigated with TCAD simulations. Additionally, its influence during Fault under Load is investigated.
This paper compares the design and performance of two controls for half-bridge converters with LCL output filters based on Virtual Circuit Design method, which is an intuitive way to achieve desired closed-loop behaviours as well as resonance damping and low-frequency behaviours. The first control is represented by a circuit employing a resistor in series with a converter-side inductor to stabilize...
This paper provides conclusions on design and laboratory tests of a hybrid rectifier prototype which employs the newest generation of SiC transistors and diodes. For the presented hardware prototype the AC-DC efficiency is about 98%. Based on simulation analysis and the practical realization pros and cons of this topology were identified. It should be noted that hybrid rectifiers importance is growing...
This paper presents a technique to model electric devices and systems, which cannot be represented adequately with rational transfer functions, to be integrated in electric transient simulations. Such technique has been successfully validated and exploited in the modeling and optimization phase of a fast switching converter with its load, which is a coil subject to skin, proximity and shielding effects...
The increasing complexity of power grids makes hardware-in-the-loop simulations of electrical power systems more and more interesting for the industry. The simulation models are typically large. They often have to be split and used on several hardware platforms to allow efficient computations. Finding an appropriate position for splitting the simulation model requires expert knowledge about the electrical...
Medium frequency transformers are an essential part of new energy conversion systems, and are very often subject to non-sinusoidal excitation. Therefore, usual methods to represent magnetic materials behavior inside transformers with electrical equivalent scheme are very limited in this case. This paper focuses on the development of a new model based on the loss separation method. This model is implemented...
In this paper, stability of regenerative brake control system is studied, focusing on the difference in the feeder line circuit model on factory test conditions and actual load conditions. The factory test is always carried out to determine the gain of regenerative brake control system because there are restrictions in the on-track test. However, the influence on the difference of the circuit configurations...
This paper proposes a discontinuous current mode (DCM) feedback current control for a single-phase grid-tied inverter in order to minimize a LCL filter without worsening total harmonic distortion (THD) of a grid current. In DCM, there are two nonlinearities occurring in the transfer functions; the first non-linearity occurs in the duty-ratio-to-current transfer function which worsens the current command...
Magnetic components using soft core materials are widely used in power electronic converters. The hysteresis effect of the material leads to power loss and harmonic distortion. If this effect can be modeled in system-level time-domain simulation, the performance of the magnetic component in combination with power converters can be predicted more accurately during the design phase. This work proposes...
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