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The increasing scale and capacity of power grid will lead to the increase of short-circuit current (SCC) level of the buses, which poses threats to the safe and stable operation of power grid. This paper proposes a dynamic partitioning technology for dynamically adjusting power grid partition structure by means of line-switching and load-transferring aiming at the problem of excessive SCC of buses...
Ultra high voltage direct current (UHVDC) hierarchical connection to AC grid mode has the advantages of leading flow reasonable distribution and improving voltage support capability of receiving-end system. But the DC transmission system based on line-commutated inverter has the inherent voltage stability problem. This paper focuses on the voltage stability of AC-DC system under UHVDC hierarchical...
Existing channel modeling method may not apply well to the high mobility communication scenarios, such as the high speed railway communications, as they implicitly overlook the dynamic of ambient objects, or, the variation of local scattering caused by the very fast changing of mobile station locations. In this paper, we propose an HSR fading channel model by characterizing the time-dependent evolution...
In high mobility wireless communication scenarios, the most challenging issue is to cope with the extremely fast fading channel. Compared with its static counterpart, channel estimation in high mobility scenarios consumes excessive energy and spectrum to achieve similar performance. To address this issue, we exploit delay correlation with sequential antenna-hopping (AH) to convert the rapid fading...
In this study, the authors propose a new class of rateless codes applicable to noisy channels, that is, the so-called accumulate rateless (AR) codes, which concatenate the low density generator matrix (LDGM) rateless code with a simple post-code, that is, a post-position accumulator. The new coding structure is not only effective in reducing the 'error floor' as observed in traditional LDGM rateless...
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