The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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...
Conventional direct power control (DPC) technique is a simple and efficient control strategy for three-phase PWM rectifier. However, its performance is deteriorated when the converter is supplied by unbalanced or distorted grid voltages. This paper presents the design and implementation of a new DPC scheme based on disturbance rejection principle to achieve sinusoidal input currents operation of three-phase...
The aim of this paper is to determine an appropriate model of a hybrid diesel-electric locomotive in order to estimate its fuel consumption and test new energy managements. The locomotive is composed of a diesel-based generation subsystem, a battery — supercapacitors storage subsystem and a traction subsystem. A quasi-static model of the locomotive has been carried out from dynamical model. It allows...
This paper discusses the performance of an AC-DC converter which converts power from 13.56MHz AC to DC in a receiving side of wireless power transfer systems. The wireless power transfer systems are required to operate in high-frequency such as 13.56 MHz in order to achieve a high power density of transmission coils. Thus the AC-DC converter in the receiving side is demanded to operate at high-frequency...
Time domain technique is used to analyze the LCC converter with capacitive output filter. The converter was operated with frequency control above resonance under heavy load conditions. The analysis is validated with PSPICE simulation and results from an experimental prototype.
This work presents a new multilevel unidirectional single-phase PFC rectifier topology well-suited for applications targeting for high efficiency and/or high power density. The characteristics of this rectifier topology, including the principles of operation, modulation strategy, feedback control scheme, and dimensioning equations are described in this paper. Finally, a 3 kW laboratory prototype is...
This paper presents new three-phase high power factor ac grid interface circuits appropriate for future bipolar dc active distribution networks. The ac-to-dc power converter concept is constructed by combining a six-switch buck-type PFC converter and a bipolar dc-dc boost-type inverting-link circuit. The characteristics of this concept, including an appropriate modulation and control structure, are...
This paper deals with a comparative evaluation of the single-phase “VIENNA I” and the “DBE” rectifiers. Their cores respectively involve one and two coils. They operate in continuous current and PFC modes thanks to an AC side current control. The two coils allow to get a “Double Boost Effect” during each half-period of the mains, then transmitting the stored energy to both DC capacitors. This is not...
In this paper two different conversion systems of wind energy into electricity are investigated. In the first system studied the wind turbine is connected to a three phase diode rectifier. At the output of the non-controlled rectifier a DC/DC boost converter is connected. Controlling the switching pattern for the DC/DC converter the maximum power point tracking (MPPT) is achieved. In the second system...
Efficiency is a fundamental UPS performance criterion. Remarkably, UPS efficiency in field applications may deviate from controlled laboratory conditions. This paper focuses on the impact of mains supply on double-conversion UPS efficiency. As the mains supply mostly affects the rectifier section, the results also provide a reference on the impact of mains supply on rectifier efficiency.
Regulations restrict the harmonics permitted on civil aircraft electrical power supplies. However, the More Electric Aircraft (MEA) will see a significant increase in high switching frequency power electronic conversion which may include 3-phase active PWM rectifiers. This paper describes an optimal LCL filter design method for 3-phase 2-level active rectifiers affixed to a variable frequency grid...
Cascaded H-bridge rectifier paves the way of high-voltage applications without input transformer such as locomotive tractions. In the current study, a novel voltage balancing method based on improved PD-SPWM (phase-disposition sinusoidal pulse width modulation) is proposed that eliminates the multiple PI regulators in traditional balancing algorithms. This algorithm is simple to realize and effective...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.