缆系海底观测网电力系统结构与拓扑可靠性

Power System Structure and Topology Reliability of Cabled Seafloor Observatory Networks

缆系海底观测网可持续提供充裕电能和通信带宽给大量海底科学仪器.基于可靠性和经济性的原则,分析得观测网电力系统适合采用负高压单极直流输电、以海水作为电流回路、海底负载并联供电和级联式高频直流变换的总体方案,并以此为基础设计了观测网的物理架构.根据观测网的特点,总结了海底电力系统适合采用的几类典型拓扑,并以水下基站平均供电可靠度为可靠性指标,计算并比较了这些典型拓扑的可靠性,可为观测网的拓扑规划提供依据.进一步设计了海底电力系统的运行模式,以提高观测网的容错能力.研究结果可为国家未来建设大规模观测网提供参考.

Cabled seafloor observatory networks（CSONs）can provide a large amount of undersea scientific instruments with sustained and abundant power.According to the principles of reliability and economy,the paper illustrates why the power system of CSONs is suitable to adopt the negative monopole DC transmission scheme with the seawater as the current returning path by parallel connecting undersea loads,and employing the cascaded high-frequency DC-DC conversion system,and then the CSONs＇ physical structure is established based on the analysis. According to the CSON＇s characteristics, several typical undersea power system topologies are summarized.With the average power feeding reliability of the undersea stations as the reliability index,the reliability indexes of these typical topologies are calculated and compared.This method can provide a basis for the CSONs＇ topology planning.Furthermore,the operation mode of the undersea power system is designed to enhance the CSONs＇ fault-tolerance capability.The study can be a reference for the future construction of large-scale national CSONs.