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中文摘要：
换流变压器可靠性对整个高压直流（highvoltagedirectcurrent，HVDC）输电系统可靠性的影响非常大，因而有必要加强对换流变系统的可靠性评估。提出了单12脉波接线的换流变系统状态间转移率（故障率、修复率和安装率）的确定方法，采用等值元件组模型建立了不计和计及备用换流变时的换流变子系统的马尔可夫状态空间图。分析了换流变备用方案成本与单12脉波接线的换流变系统可靠性的关系，总成本最小的备用方案即为最优备用方案。算例结果验证了该方法的有效性，根据各方案可靠性评估结果可确定最优备用方案。
英文摘要：
The reliability of converter transformer greatly impacts on the reliability of whole HVDC power transmission system, so it is necessary to enhance reliability evaluation of converter transformer system （CTS）. A method to determine the transition rate among states of CTS with 12-pulse wiring, namely the failure rate, repair rate and installation rate, is proposed, and based on equivalent component group model a Markov state space graph for converter transformer subsystem with 12-pulse wiring, in which the standby converter transformer is taken into account or not, is built. The relation between the cost of alternative scheme of converter transformer and reliability of CTS with 12-pulse wiring is analyzed, and the alternative scheme with minimum total cost is the optimal one. The effectiveness of the proposed method is verified by case calculation.
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