柔性输电设备短期可靠性评估算法  

Short term reliability evaluation algorithm for flexible transmission equipments

作　　者：李生虎[1] 刘正楷[1] 崔芳[1] 郑杨斌[1] 

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009

出　　处：《电力系统保护与控制》2009年第21期1-6,53,共7页Power System Protection and Control

基　　金：教育部新世纪人才支持计划(NCET-08-0765);安徽省优秀青年科技基金(08040106825);国家自然科学基金(50707006)~~

摘　　要：基于大功率电力电子技术的柔性输电设备,元件修复(替换)时间差异很大,可能包括冗余元件。其可靠性水平与运行方式和故障模式有关,状态概率随时间变化。采用稳态不可用率抽样设备状态,将引起较大误差。基于有限可靠性评估周期,建立适于多状态系统的平均不可用率解析算法。证明平均不可用率与状态初值、可靠性评估周期有关。证明平均不可用率不能按串并联结构直接等值。给出了高压直流输电系统换流桥的分析结果以检验算法的可行性。Flexible transmission equipments are based on high power electronics elements with different repair/replacement duration and redundant design. Their risk level is decided by the operation conditions and failure modes, therefore time-dependent. Notable error will be introduced by state sampling with the steady-state unavailability. Based on limited evaluation period, analytical solution to the average unavailability of multi-state systems is proposed, which is dependent on the initial states and evaluation periods. It is proved that the average unavailability can not be directly calculated by the series/parallel configuration. Numerical analysis for HVDC converters with redundant valves is provided to validate the feasibility of the proposed algorithm.

关 键 词：可靠性评估 柔性输电设备 瞬时状态概率 平均不可用率 

分 类 号：TM732[电气工程—电力系统及自动化]