中国电机工程学报2025，Vol.45Issue(z1)：113-126,14.DOI:10.13334/j.0258-8013.pcsee.251446
基于关键准稳态的新能源电力系统暂态频率安全快速评估
Rapid Evaluation of Transient Frequency Security for Renewable Energy Power System Based on Critical Quasi-steady-state
摘要
Abstract
The frequency dynamics of the new power system are significantly influenced by the fault ride-through behavior of renewable energy generators(REGs).Currently,accurate transient frequency stability assessment can only be achieved by electromechanical transient simulation,which is challenging for real-time application.To tackle this challenge,this paper proposes a quantitative evaluation method for transient frequency security based on critical quasi-steady-state(CQSS)calculation.By directly computing several CQSS snapshots during fault conditions,the proposed method effectively determines the operating states of REGs and enables accurate and rapid calculation of frequency security indicators during the transient process.In specific,this paper first develops a CQSS calculation method during fault conditions which is used to assess the rate of change of frequency.Subsequently,a generalized method for directly solving the post-fault steady-state frequency is proposed by introducing the system frequency variable.Finally,the average system frequency model based on quasi-steady-state(QSS-ASF)is established considering the power deficit characteristics of REGs under different operating states.Based on the QSS-ASF model simulation,the frequency nadir can be estimated under given short circuit fault events.The effectiveness of the proposed model and method is validated on a modified IEEE 39-bus system.The results demonstrate that the proposed method can effectively determine the operating states of each REG under various disturbances or different power supply configurations.Moreover,the relative errors of frequency security indices are all under 2%validating both high accuracy and computational efficiency.关键词
关键准稳态/频率变化率/频率极值/故障后稳态频率/平均系统频率模型/低电压穿越Key words
critical quasi-steady-state/rate of change of frequency/frequency nadir/post-fault steady-state frequency/average system frequency model/low voltage ride-through分类
动力与电气工程引用本文复制引用
李聪,戴博伟,段超,李崇涛,张建新,刘映尚..基于关键准稳态的新能源电力系统暂态频率安全快速评估[J].中国电机工程学报,2025,45(z1):113-126,14.基金项目
智能电网重大专项(2024ZD0801200) （2024ZD0801200）
国家自然科学基金项目(52307135). Project Supported by Smart Grid National Science and Technology Major Project(2024ZD0801200) （52307135）
Project Supported by National Natural Science Foundation of China(52307135). （52307135）
