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A kind of substrate integrated waveguide (SIW) dual-band bandpass filters (DB-BPFs) with flexibly allocated center frequencies (CFs) and fractional bandwidths (FBWs) is presented based on TE101 and TE201 modes in SIW rectangular cavities. Emphasis is placed on filters design to simultaneously realize the external quality factors Qe and coupling coefficients Mij required for both passbands by determining...
The crevasse, which has always been one of the most dangerous factors on the Antarctic continent, threatens the life of the team members during the polar expedition. Crevasse detection is thus an increasingly important issue as it facilitates the analysis of glaciers and ice cap movements, research on the effects of climate change, and improves security for expedition staff. In this paper, we first...
Through describe the principles and characteristics of EPON network, Proposed EPON communications network applying smart substation process level, and test the adaptability of protection under the EPON network. The paper has constructed smart substation relay protection dynamic simulation model test platform based on EPON network. Selecting 220kV smart substation busbar protection, transformer protection,...
Large-capacity wind power will have impact on transmission line protection and auto-reclosing when short circuit occurs. This paper analyses the characteristics of wind farm model and the influences of wind power to transmission line differential protection as well as its auto-reclosing, then proposed countermeasures to meet and overcome the problem.
Large-capacity wind power will have impact on transmission line protection when short circuit occurs. This paper built the dynamic simulation model of different wind turbine generator through physical devices, and tested through operation and faults. By analysis of characteristics of wind farm model, this paper analyzed the influences of wind power to transmission line differential protection and...
A dual-band filter has been designed and fabricated using two dual-mode resonators. Current distributions of four modes of this filter are investigated using full-wave electromagnetic simulations. It shows that the folded canonical topology can be realized using the proposed dual-mode filter structure. A dual-band filter is optimized using an analytical procedure and the corresponding coupling matrix...
The resonance fault current limiter (RFCL), which avoids the disadvantages of the series reactor, is feasible for EHV and UHV grid. To contribute to project application of the RFCL, and study its running characteristic and impact on relay protection, the dynamic simulation lab of State Grid simulation center carries out the research on simulation technique for RFCL. The principle and technical properties...
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