排序方式: 共有16条查询结果,搜索用时 17 毫秒
1.
Wouter R. A. Ryckaert Jozef A. L. Ghijselen Jan J. M. Desmet Alex P. M. Van den Bossche Jan A. A. Melkebeek David M. Van de Sype 《Electrical Engineering (Archiv fur Elektrotechnik)》2005,87(6):315-326
Although complete compensation is only possible using true active filters, resistive shunt harmonic impedances (SHI) have
been shown to provide a considerable reduction of the harmonic propagation.
In this paper, the harmonic mitigation potential of a resistive SHI is discussed concerning its influence on the voltage distortion
profile along a typical distribution feeder, with the location of the SHI along the feeder as a parameter. Although the distortion values
are dependent on the SHI location, it is shown that the end of the feeder is generally a good location to install the SHI,
especially when the power system parameters can vary or are unknown.
Calculations are performed on a typical radial distribution feeder. Both the power factor correction capacitors and the non-linear
loads are concentrated in single nodes. The linear loads are disconnected to obtain the worst case for the voltage distortion.
Also some measurements on a scale model of a typical distribution feeder are done and the experimental results confirm the
results obtained from simulations. 相似文献
2.
3.
Ryckaert J. Desset C. Fort A. Badaroglu M. De Heyn V. Wambacq P. Van der Plas G. Donnay S. Van Poucke B. Gyselinckx B. 《IEEE transactions on circuits and systems. I, Regular papers》2005,52(12):2515-2525
The successful realization of a wireless body area network (WBAN) requires innovative solutions to meet the energy consumption budget of the autonomous sensor nodes. The radio interface is a major challenge, since its power consumption must be reduced below 100 /spl mu/W (energy scavenging limit). The emerging ultra-wide-band (UWB) technology shows strong advantages in reaching this target. First, most of the complexity of an UWB system is in the receiver, which is a perfect scenario in the WBAN context. Second, the very little hardware complexity of a UWB transmitter offers the potential for low-cost and highly integrated solutions. Finally, in a pulse-based UWB scheme, the transmitter can be duty-cycled at the pulse rate, thereby reducing the baseline power consumption. We present a low-power UWB transmitter that can be fully integrated in standard CMOS technology. Measured performances of a fully integrated pulse generator are provided, showing the potential of UWB for low power and low cost implementations. Finally, using a WBAN channel model, we present a comparison between our UWB solution and state-of-the-art low-power narrow-band implementations. This paper shows that UWB performs better in the short range due to a reduced baseline power consumption. 相似文献
4.
5.
Frederik M. L. L. De Belie David M. Van de Sype Koen De Gussemé Wouter R. A. Ryckaert Jan A. A. Melkebeek 《Electrical Engineering (Archiv fur Elektrotechnik)》2007,89(5):363-370
A novel digital voltage controller for boost PFC converters is proposed in this paper. If a fast voltage compensator is applied
to control the DC output voltage, the DC output voltage ripple, pulsating at twice the grid frequency, causes a third harmonic
of considerable magnitude in the line current. The new controller samples the DC-bus voltage at all zeroes of its ripple,
resulting in a fast voltage control algorithm that guarantees a low total harmonic distortion in the line current. The performance
of the proposed voltage controller is compared to other voltage controllers, by using a prototype of a digitally controlled
boost PFC convertor. 相似文献
6.
B. Renders W.R. Ryckaert K. De Gussem K. Stockman L. Vandevelde 《Renewable Energy》2008,33(5):1011-1018
Voltage dip immunity of converter-connected distributed generation units will become increasingly important. This paper focusses on the relation between the voltage-dip ride-through capability of converters and their current-control strategy. A comparison is made between a recently proposed control strategy with programmable damping resistance and the classical sinewave control algorithm. The first-mentioned control structure will prove to yield an improved voltage dip immunity. Experimental tests on a single-phase full-bridge bidirectional converter are carried out and validate the aforementioned postulations. 相似文献
7.
In order to assess the energy efficiency of an indoor lighting installation, a criterion for the installed electrical power is proposed which is broadly applicable and easy to use. Introducing target values for lamps and gear and taking into account some basic lighting comfort requirements, the maximum electrical power to be installed can be predicted for any kind of application. Herewith, one or more task areas with appropriate target illuminance values may be defined. The key parameter of the criterion is the analytical expression for the target utilance as a function of common lighting design parameters.Two practical examples illustrate the validity of the criterion. In a first example, a general case where the task area is coincident with a reference plane parallel with the floor has been studied. The values obtained converge to actual target values in current practice. In a second example, the lighting design of a store with many vertical task areas is explained. These cases illustrate the advantages of the criterion as compared to energy evaluation criteria based on the normalized power density.From 2010 on, the proposed criterion will be used in Flanders to assign grants for a re- or newlighting. 相似文献
8.
Channel model for wireless communication around human body 总被引:2,自引:0,他引:2
A channel model for a wireless body area network at 400 MHz, 900 MHz and 2.4 GHz is derived. The electromagnetic wave propagation around the body is simulated with a finite-difference time-domain simulator. Creeping waves were identified as the propagation path around the body. Its impact on the delay spread in an indoor environment is discussed. 相似文献
9.
J.?A.?GhijselenEmail author W.?A.?Ryckaert J.?A.?Melkebeek 《Electrical Engineering (Archiv fur Elektrotechnik)》2004,86(4):181-190
The impact of the design parameters of electric power distribution systems on the propagation of harmonic distortion is investigated. This conceptual study is based on simulations on a generalized distribution system model, and leads to an increased insight in the mechanisms of the generation and propagation of voltage distortion. Moreover, analytical expressions are presented that predict the impact of changing design parameters on voltage distortion. 相似文献
10.
Ryckaert J. Verhelst M. Badaroglu M. D'Amico S. De Heyn V. Desset C. Nuzzo P. Van Poucke B. Wambacq P. Baschirotto A. Dehaene W. Van der Plas G. 《Solid-State Circuits, IEEE Journal of》2007,42(11):2515-2527
A low-power impulse-radio ultra-wideband receiver is demonstrated for low data-rate applications. A topology selection study demonstrates that the quadrature analog correlation is a good receiver architecture choice when energy consumption must be minimized. The receiver operates in the 3.1-5 GHz band of the UWB FCC spectrum mask on channels of 500 MHz bandwidth. The pulse correlation operation is done in the analog domain in order to reduce the ADC sampling speed down to the pulse repetition rate, thereby reducing the power consumption. The receiver comprises a low-noise amplifier with full on-chip matching network, an RF local oscillator generation, two quadrature mixers, two analog baseband chains followed by two ADCs, and a clock generation network. The receiver is implemented in 0.18 mum CMOS technology and achieves 16 mA power consumption at 20 Mpulses/s pulse repetition rate. 相似文献