| To take advantage of reginal and world wide large scale renewable resources available, it is necessary to construct Ultra High Voltage Transmission Line corridor. UHV technologies are gaining the ground and becoming popular due to its outstanding technical and economical preformance. With the demands in world energy conservation and environmental protection, smart power grid and UHV transmission become world trend for future grid development.At present, High Voltage Transmission technology is deploying rapidly in China. Starting from the acquired technology world wide, China developed its proprietary UHV transmission technology. A number of issues are observed: proprietary communication protocols, information sharing bottlenecks, platform compatability and quality difference, and resource utilization and standarization etc. It is of significant importance that investigate the reliability of IEC61850 based UHV line protection system.This thesis briefly review the IEC61850 based smart UHV stations, and its transmission line protection schemes, analyses its process bus architectures and the multi-function devices, and to solve the repeated route issues during reliability calculation. A reliability calculation algorithm is proposed where the acquired control signals may travel over recurrent routes. A software using Visual C++ is developed to evaluate the reliability of intelligence UHV lines protection schemes with various communication architectures, for example, point-to-point connected fiber network connections, network switch process bus etc. The calculated reliability indexes associated with each scheme indicate that the availability of components and the process bus communication architecture have a profound impact on the overall UHV protection schemes: the higher availability of components, the higher reliability of the UHV protection schemes; use of less components connected over the signal path, the more improved system performance. |
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