计及系统状态的多端柔性直流输电系统可靠性评估及灵敏度分析  

Reliability Assessment and Sensitivity Analysis of Multiterminal VSCHVDC System Considering System Status

作　　者：马彦琴 杨刚 李湛宇 郭莹 雷博鸿 MA Yanqin;YANG Gang;LI Zhanyu;GUO Ying;LEI Bohong(Northwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Xi’an 710075,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]中国电力工程顾问集团西北电力设计院有限公司,西安710075 [2]西安交通大学电气工程学院,西安710049

出　　处：《电力电容器与无功补偿》2024年第6期98-107,共10页Power Capacitor & Reactive Power Compensation

摘　　要：多端柔性直流输电技术正在迅速发展,而对其进行可靠性分析是保证直流输电系统安全稳定运行的前提。由于目前缺乏对多端直流输电系统可靠性的定性与定量评估以及提升方法的研究,本文提出了一种基于状态空间法和分步组合模型的多端柔性直流输电系统可靠性建模方法。该方法考虑到多端柔性直流输电工程的多种实际运行状态,分别建立了直流线路和换流站子系统的状态转移模型,通过求解供电可用率、年等效停运时间等可靠性指标验证了该方法的正确性与可行性。最后采用分层等值法建立了可靠性指标对元件故障率灵敏度的解析表达式,定量分析得到了系统可靠性最薄弱环节。研究可给实际柔直工程的可靠性评估提供一定的参考。The multiterminal VSCHVDC transmission technology is developing rapidly and its reliability analysis is a prerequisite to ensure the safe and stable operation of the DC transmission system.Due to the lack of qualitative and quantitative assessment and study of improvement methods for the reliability of multiterminal DC transmission systems at present,a kind of reliability modeling method for multiterminal VSCHVDC systems based on status spacial method and stepbystep combination model is proposed in this paper.The various practical operating status of multiterminal VSCHVDC transmission projects are considered in this method,the status transition models for DC line and subsystem of converter station are set up respectively.The correctness and feasibility of this method are verified by solving such reliability indicators as power supply availability and annual equivalent outage time.Finally,an analytical expression for the sensitivity of reliability index to component failure rates is set up by using the hierarchical equivalence method,and the weakest link of system reliability is quantitatively analyzed.The research can provide some reference for the reliability assessment of actual VSCHVDC projects.

关 键 词：多端柔性直流输电 运行模式 状态空间法 可靠性 灵敏度 

分 类 号：TM721.1[电气工程—电力系统及自动化]