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The PSCAD simulation model of Yindong HVDC system is established based on the actual parameters. Establish AC equivalent (Shandong power grid) model of inverter side using a suitable method for electromagnetic transient simulation, set up different types of faults to Shandong power grid, including unbalanced fault (ground fault) and symmetric faults (three-phase short-circuit fault), research and...
International submarine cables play an important role of global communication backbone because they carry variety of important services. Recently, nature disasters such as earthquakes, undersea landslides happen frequently and often cause the interruption of submarine cables. After finding the fault location of submarine cable, telecommunication carriers will redistribute routes according to restoration...
The architecture of an interconnection network is usually represented by a graph, and a graph G is Hamiltonian if it has a Hamiltonian cycle which traverses every node of G exactly once. In this article, we analyze the conditional edge-fault Hamiltonicity of the enhanced hypercube, which is an attractive variant of hypercube and can be obtained by adding some complementary edges. For any n-dimensional...
Single-phase Auto-reclosing (SPAR) is widely used on EHV/UHV transmission lines to improve power system reliability. However, reclosing on to a permanent fault can adversely affect the system stability and damage generators and other equipment connected to the line. To solve this problem, a new algorithm for improving the single-phase adaptive autoreclosure is presented in this paper. Firstly, primary...
The paper has extracted the energy spectrum entropy of wavelet packet as the eigen vector of fault patterns, through analyzing the vibration signal in the decomposition of wavelet packet when Low-Voltage (LV) Circuit Breaker broke down. Based on the concept of Clustering Center, a Naïve Bayesian classifier has been constructed. By using the weight of probability measure, the correlations between...
The online transformers are sometimes affected by dc bias caused by geomagnetically induced currents (GIC) or HVDC/UHVDC transmission system in monopolar grounding-return mode. With dc bias, the transformer is prone to saturate and rich harmonics are introduced, on the other hand, the reactive power consumption is more different from that without dc bias. Based on the piecewise model of iron core,...
Both geomagnetically induced currents (GIC) and high voltage direct current (HVDC) projects using the earth as its path can cause direct current flowing in the ground. Direct current flux will be produced and has detrimental effects on power systems. Few references can be found about the effects of dc bias on the current transformer that is very important to both metering and protective aims. In this...
Previous Probe Gap Model (PGM) based available bandwidth (AB) estimation methods all request the "busy assumption" that probing packet pairs should be in the same busy period when transmitted on bottleneck link, which is hard to satisfy especially for the low utilization path. In this paper, we first present a new probabilistic methodology to estimate AB under "non busy assumption"...
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