Xiaojian Li's research while affiliated with China Telecom Beijing Research Institute and other places
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Publications (12)
The electromagnetic radiation sensitivity of the electric explosive device (EED) and its installed use state is closely related to the size of the equipment and radiation field strength constraints. The use of the traditional all-level electromagnetic radiation method for the effect of the actual installed EED test in the electromagnetic environmen...
How to charge high-temperature superconducting coils is a crucial problem for superconducting magnets. In recent years, flux pump is recommended as a promising method for current compensation since it can charge coils without electrical contact to current source. In this work, two types of charging methods, rotating magnet based flux pump and magne...
As the capacity of all-electric ships (AES) increases dramatically, the sudden changes in the system load may lead to serious problems, such as voltage fluctuations of the ship power grid, increased fuel consumption and environmental emissions. In order to reduce the effects of system load fluctuations on system efficiency, and to maintain the bus...
This paper presents a new trapped-field magnet made of second-generation high-temperature superconducting (2G HTS) rings. This so-called ring-shape 2G HTS magnet has the potential to provide much stronger magnetic fields relative to existing permanent magnets. Compared to existing 2G HTS trapped- field magnets, e.g. 2G HTS bulks and stacks, this ne...
This paper presents a multi-level model that contains circuit level, cable level and layout level description of EMT system which is used for the analysis of conducted emission. SPICE and MTL methods are employed to perform the simulation. Comparisons between simulation and measurement results are made to validate the model.
Citations
... It is a very used approach, but it is not practical during the design process, as a prototype is needed. When obtaining impedance vs. frequency curves, two different connection layouts are usually used [12,13,[15][16][17][20][21][22][23][24][26][27][28][29][31][32][33]35,36]. In Figure 6a Additionally, in [21,22,26,28], it is stated that even if IPMSM have been widely treated as IM for the simulation of EMI, the characteristic impedance is different as DM impedance varies with the rotor position due to the variation of reluctance, as shown in Figure 7. Thus, [22] introduces a new measurement consisting of measuring the impedance of two phases in series. ...
... Most models proposed in the literature are empirical, with parameters calculated using analytical approximations from measurements or fitting procedures [10][11][12][13][14][15][16]. These models are generally more accurate and quicker to develop but require experimental prototypes for calibration. ...
... H IGH-T c superconducting (HTS) dynamos [1]- [11], are a subclass of HTS flux pump [12]- [19], which have attracted significant recent interest [20]- [25]. The HTS dynamo is topologically identical to a standard ac alternator, but the use of an HTS coated conductor (CC) for the stator wire has the dramatic effect of making these devices partially self rectifying; that is, they generate a net dc output V dc . ...
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... Moreover, SMES units are successfully used in the specific context of marine power systems and, more generally, in naval applications, usually in combination with other storage devices. This was the case in [7], where a hybrid ESS (combining SMES and batteries) was proposed for peak and pulsed load supply. A similar employment of SMES for marine power systems was also found in [8], where the authors exploited this storage technology to control the DC bus voltage of a power converter under peak load conditions. ...
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... In contrast to HTS bulks and stacks, HTS ring magnets produced with long commercial 2G HTS tapes can be made in various sizes. [21][22][23][24][25][26][27] The feasibility of fabricating jointless tape-based HTS magnets with persistent current was first demonstrated with a single long HTS tape using the "wind-and-flip" method. However, the flip process and long ends of this design make it mechanically weak. ...
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