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.
In this paper the implementation of the galvanic isolation in the low voltage direct current (LVDC) network is discussed. The galvanic isolation can be implemented either with a 50 Hz transformer located at the customer AC output of the customer-end inverter (CEI) or with an isolated DC-DC converter at the input DC network side of the CEI. However, the former solution results in a significant increase...
In this paper, an optimization regarding volume, efficiency and costs of AC boost inductors in 3-phase PWM converters based on detailed multi-domain models is presented. The optimization is performed for a wide switching frequency range of 5–80 kHz and a wide current ripple range of 5–100 %, considering ferrite, amorphous and powder core materials in combination with round, litz, foil and flat wire...
In this work a compact-model-based inductor design procedure is presented. The losses, temperatures, and the total cost of ownership (TCO) of an inductor are expressed analytically. All geometric dependencies are summarized in a set of parameters which are calculated using finite element analysis (FEA). Therefore the model does not depend on the actual inductor geometry, instead it only relies on...
The harmonic currents generated by the line-side converter of high speed trains may cause the time-varying resonances when the harmonic frequency is close to the resonance frequency of the power supply line. It may destroy the facilities in the power supply range and affect the operation of trains. To avoid the affection, the characteristic of resonance impedance is calculated and simulated with a...
The contactless power transformer systems (CPTs) have recently attracted much attention as it is possible to supply electrical energy to mobile vehicles without cables. 300kW class CPT systems are required for railway vehicles power feeding applications. In this power range, there are some technical problems such as higher reactive power due to longer gap and power control at the misalignment of ground...
Metallic communication lines in wire communication systems are usually used as power lines. Ac communication signal and dc supply power are separated at input part of a powered terminal. Conventional well-known separators utilize the combination of inductors and capacitors. When the signal frequency is low, volume of these components increases. A conventional electronic choke circuit using transistors...
The wide band gap nature of SiC semiconductor makes high voltage power device possible to operate at high temperature. The high temperature operation of power device is expected to realize simplification of cooling system and miniaturizing the system size with smaller heat sink and/or less liquid cooling system. However, conventional plastic packaging for Si power device is designed to operate lower...
AC-Choppers using instantaneous voltage control technique to solve voltage sag problems are proposed in this paper. The developed AC-chopper for series voltage sag compensation is applied for three phase four wire system; therefore, three single phase ac chopper circuits and three series transformers are utilized. By using AC-chopper, there are no required for a dc bus; thereupon, the size of proposed...
High frequency transformers are widely used in Switched-mode power supplies and now are being proposed to be used with power electronic converters to replace line-frequency transformers. This paper presents a winding design procedure for minimizing the power losses using foils and solid round wires under sinusoidal excitation to limit the temperature rise. This paper derives the range from which the...
One of the limiting factor in the course of reducing the size of high frequency transformer is the temperature rise. The knowledge of transformer power loss is important to make an estimate of the temperature rise. The transformer winding loss due to a duty-cycle regulated square current waveform can be estimated by summing the copper loss due to each harmonic using Dowell's formula. The paper shows...
This paper examines the fault ride-through strategy of a three-phase PV system with respect to compliance to the German Transmission Code. Specifically, the paper examines the case of a single line-ground fault which occurs predominantly in the distribution system. The paper proposes the injection of reactive power on a perphase basis to the faulty phases while maintaining active power injection to...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.