电力系统自动化2025，Vol.49Issue(10)：12-19,8.DOI:10.7500/AEPS20240716003
大扰动下电力系统频率安全概率指标初探
Preliminary Study on Probabilistic Indicators for Frequency Security of Power Systems Under Large Disturbances
摘要
Abstract
The increasing uncertainty in various influencing factors of system operation has led to the inability of existing frequency security deterministic indicators to comprehensively and accurately represent the frequency security level.Therefore,new probabilistic indicators are proposed with the frequency nadir as the research object.By analyzing the initial conditions of frequency dynamics variation after system is disturbed,including the probabilistic distribution characteristics of the active power deficit caused by disturbances,the initial frequency deviation prior to disturbances and system frequency response capability,as well as their impact on frequency dynamic characteristics,the probability distribution patterns of frequency dynamics process are revealed.Based on analysis results and following design principles of frequency security indicators,two probabilistic indicators for the frequency security are designed according to the losses from under-frequency load shedding and the distance between the disturbed frequency and the under-frequency load shedding threshold,and their calculation method and process are provided.Simulation results validate the correctness of the probabilistic characteristic analysis of frequency dynamics process,and the designed indicators can comprehensively and accurately represent the system frequency security level.关键词
电力系统/频率安全/频率动态过程/概率分布/概率指标/低频减载Key words
power system/frequency security/frequency dynamics process/probability distribution/probability indicator/under-frequency load shedding引用本文复制引用
李卫东,王祥旭,于瀚林,葛延峰..大扰动下电力系统频率安全概率指标初探[J].电力系统自动化,2025,49(10):12-19,8.基金项目
国家自然科学基金资助项目(U22A20223) （U22A20223）
已申请国家发明专利(申请号:CN202410494338.0). This work is supported by National Natural Science Foundation of China(No.U22A20223). （申请号:CN202410494338.0）
