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A qualitative model based on hierarchical signed directed graph (HSDG) is built to analyze the fault propagation characteristics in large scale electronic systems. Compared with the traditional single layer SDG model, the HSDG has combined the topology structure information into the model, and the diagnosis inference process can be implemented hierarchically, which can reduce the fault root cause...
Advances of semiconductor technology have brought impressive performance improvements in Very Large Scale Integrated (VLSI) circuits. Nonetheless, they have also led to increasing rates of faults occurrence. In order to circumvent these faults in on-line and off-line BIST, a novel input vector monitoring concurrent BIST scheme termed pre-Computed test Set Monitoring and Real Time Comparing (CSMRTC)...
In nowadays, fault diagnosis method for analog circuit based on support vector machines, has become a hot topic in research field of fault diagnosis. However, in practical application of this method, the imbalanced problem occurred in fault sample dataset has greatly influenced its effectiveness. To remedy this problem, this paper proposed an improved Support Vector Machines method based on biased...
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...
As one strategy of power management, microgrid has the special superiorities on not only improving power quality but also relieving the pressure on energy and environment. To carry out experiment and research, a small laboratory-scale microgrid system with energy storage device, single phase and three-phase photovoltaic devices and wind power devices are planned to build. Fault current in the microgrid...
In some regional grids in China, wind power penetration will increase rapidly because of the abundant wind resources in those areas and the government policy impetus. As more and more attention is paid to the increase of wind-turbine farms, a number of problems should be investigated in more detail. Among these problems, the voltage stability of wind farms implemented with induction generators becomes...
The neutral point potential of the grounding transformer will be changed when HVDC system operates in a dc monopole ground return mode and dc bias may be generated. Dc bias will change exciting currentdasias waveform. Then large quantity of even and odd harmonics will be produced. The harmonics will do harm to the transformer and its protection. This paper uses PSCAD/EMTDC to create a simulation model...
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