Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Modular multilevel converters (M2C) are increasingly used in high voltage direct current (HVDC) systems. The efficiency of M2Cs is highly related to the modulation method which determines the switching frequency and capacitor voltage ripple in the converter station. A new approach to modulation of M2C is presented in this paper. Tolerance-band methods are employed to obtain switching instants, and...
This paper proposes a model predictive control (MPC) scheme for the interleaved dc-dc boost converter with coupled inductors. The main control objectives are the regulation of the output voltage to its reference value, despite changes in the input voltage and the load, and the equal sharing of the load current by the two circuit inductors. An inner control loop, using MPC, regulates the input current...
This paper presents a zero current switching predictive control strategy for a direct resonant converter which is part of a high voltage power supply. A voltage compensator is used to reduce the output distortion. The direct resonant converter and the voltage compensator consist of a three to single phase matrix converter supplying a series resonant circuit and an H-bridge converter, respectively...
In this paper a 5kW step-down converter for low-voltage high-current application is presented using normally-off SiC JFETs as high voltage power switches, operating with efficiency close to 98%. Different low voltage side rectification solutions and loss estimations are also presented. As results show higher power density and efficiency can be achieved in medium- or high-power DC-DC applications by...
Blanking time, also referred to as dead-time, is one of the dominant sources of output current and voltage distortion in pulse-width modulated power amplifiers. Extensive studies are known on elimination, minimization, and compensation of the effect. Most techniques achieve a reduction of the distortion but are not capable of completely removing it. Topologies like the opposed current converter do...
This paper presents a new torque ripple minimization technique for a Switched Reluctance Generator (SRG). Although the SRG has many advantageous characteristics as a generator, it has not been widely employed in the industry. One of the most notorious disadvantages of the SRG is its high torque ripple. In this paper, a non-unity Torque Sharing Function (TSF) is proposed to minimize the torque ripple...
Multiple phase bidirectional DC/DC converters are developed and analyzed for optimal inductor operation, high efficiency and a low current ripple. Partial-load operational mode is investigated as well. The different opportunities to degrease the size of the inductors and current ripple and to increase the efficiency are discussed.
This paper proposes a new topological arrangement that consists in connecting the AC voltage source in series with two EIE Buck converters, one to operate in the positive half cycle and the other to operate in the negative half cycle. The control strategy is developed to achieve an AC output voltage within the limits set by standards in order to mitigate problems associated with Sags and Swells on...
In this paper, a hybrid multilevel inverter topology for the generation of dodecagonal space vectors is presented which eliminates all (6n±1), n=odd harmonics from the motor phase currents in the entire range of modulation with an increase in the range of linear modulation. The topology is a hybrid of flying capacitor, H-bridge and conventional two-level inverter cells. With this topology, any standard...
This paper presents a comparison between topologies suitable for capacitor charging systems. The topologies under evaluation are a flyback converter, a half-bridge series resonant converter and a full-bridge phase-shifted converter. The main features of these topologies are highlighted, which allows the proper topology selection according to the application requirements. Moreover, the performed analysis...
More and more wind power plants are built which use voltage source converters (VSC) to feed energy into grid. This paper compares two different control techniques and shows how virtual flux direct power control (VFDPC) reduces filtering requirements at the output of the converter and helps to save up to one quarter of converter losses. Furthermore the influence of a reduced, variable dc link voltage...
In this paper the recently introduced control strategy referred as variable switching point predictive torque control (VSP2TC) is employed to control a three-level neutral point clamped (NPC) voltage source inverter driving an induction machine (IM). Based on a predictive torque control (PTC) scheme, the controller aims to reduce the high current and torque ripples that occur. In order to actualize...
Parallel voltage-source inverters with common dc bus present very interesting advantages from an industrial point of view. Indeed, by paralleling several units the power supply system includes capability to handle high power requirement, modularity and the possibility of maintenance through redundancy, within an uninterruptible supply operation. However, a special attention is required to avoid the...
This paper presents an analysis and design of a Light Emitting Diode (LED) driver aiming to substitute the electrolytic capacitors. Considering the low lifetime of electrolytic capacitors compared to LEDs, this topology aims for reducing the storage capacitance and replaces it by a longer lifetime capacitor, increasing the overall system life span. A Proportional Integral (PI) controller is designed...
This paper propose a novel Electro-Thermal Model for the new generation of power electronics WBG-devices (by considering the SiC MOSFET-CMF20120D from CREE), which is able to estimate the device junction and case temperature. The Device-Model estimates the voltage drop and the switching energies by considering the device current, the off-state blocking voltage and junction temperature variation. Moreover,...
This paper focuses on the way to use the EDLC bank in a small electric vehicle (EV). In a recent study of an EV, a supercapacitor (EDLC; Electric Double Layer Capacitor) is adopted into an energy storage system to improve energy efficiency. Generally, the EDLC bank consists of a large number of cells because the EDLC bank cell voltage is very small compared with the battery terminal voltage, which...
A novel modulation strategy for matrix converters based on space vector representation is outlined in this contribution. In particular, the method is applied to a thyristor matrix converter connecting a multi-phase generator of varying frequency with the fixed-frequency three-phase grid. Compared with the well-known space vector modulation for a three-phase voltage source inverter, the elementary...
This paper deals with the approach of integrating a CSI into the power train of a BEV using a nouveau control strategy. The proposed control strategy for CSI provides a better harmonic performance of the electrical machine and is therefore a beneficial advantage for the system performance. Using a test setup especially designed for experimental validation of CSI the introduced control strategy is...
In this paper, a new isolated DC-AC converter with “sinusoidal shape” output voltage is analyzed, simulated and verified with a scaled prototype. Design expressions for selection of passive component values and design requirements of power semiconductor devices are given. The control algorithm is thoroughly investigated. The converter losses based on the commercially available semiconductors are calculated...
In power electronic converters soft switching is an efficient way to reduce losses. A resonant tank in series with the windings of the isolation transformer in a Modular Double-Cascade converter is presented. Positive effects such as switching loss reduction, prevention of flux walking and saturation of transformer core are analyzed and discussed.
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.