考虑风电出力状态转移和直流线路功率调整的AC/UHVDC系统静态可靠性及其灵敏度评估  

AC/UHVDC System Reliability and Sensitivity Evaluation Considering State Transition of Wind Power and Power Adjustment of UHVDC

作　　者：李生虎[1] 张楠 张浩 LI Shenghu;ZHANG Nan;ZHANG Hao(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,Anhui Province,China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽省合肥市230009

出　　处：《电网技术》2021年第6期2342-2351,共10页Power System Technology

基　　金：国家自然科学基金项目(51877061)。

摘　　要：对于风电和特高压直流(ultra-high voltage direct current,UHVDC)可靠性建模,已有很多独立研究。但针对含风电AC/UHVDC电力系统,同时考虑双馈异步风力发电机(doubly-fed induction generator,DFIG)结构、风电状态转移模型、交直流设备随机故障的研究不多,且往往基于简化DFIG结构和简化UHVDC可靠性模型。考虑上述因素,对系统进行可靠性评估和灵敏度分析。对DFIG多状态转移模型,从2种视角考虑风电出力与出力转移特性。引入直流功率调整以确定换流站控制方式。采用解析枚举、概率加权法,计算可靠性指标。提出可靠性指标对直流功率、DFIG有功出力灵敏度的解析表达。算例分析验证了所提算法的有效性和应用价值。There have been many independent studies on the reliability modeling of wind power and UHVDC.However,for the AC/UHVDC power system with wind power,there are few studies considering the detailed structure of the doubly-fed induction generators(DFIGs),the state transition model of wind power and the random failures of AC/UHVDC equipment.Those studies are often based on the simplified DFIG structure and UHVDC reliability model.In this paper,the reliability evaluation and sensitivity analysis of the system are carried out considering all the above factors.For the multi-state transition model of the DFIG,the wind power outputs and the output transition characteristics are considered from two perspectives:The DC power adjustment is introduced to determine the control mode of the converter stations;the system reliability indices are derived with the analytical enumeration and the probability weighting method.The sensitivities of the reliability indices to the DC power and the wind power are newly proposed.The numerical results validate the effectiveness and accuracy of the proposed model.

关 键 词：交流/特高压直流(AC/UHVDC)系统 双馈感应电机(DFIG) 可靠性 灵敏度 状态转移 直流功率调整 

分 类 号：TM721[电气工程—电力系统及自动化]