电力系统保护与控制2026，Vol.54Issue(8)：82-92,11.DOI:10.19783/j.cnki.pspc.250951
用于直流送端区域电网频率安全评估的Ip-SFR模型及其应用研究
Ip-SFR model for frequency security assessment of DC sending-end regional power grids and its application
摘要
Abstract
With the rapid expansion of renewable energy bases in regions such as Northwest China and large-scale power transmission via ultra-high-voltage DC systems,HVDC sending-end grids are increasingly characterized by weak support and strong power export.Faults such as commutation failure and DC blocking can lead to short-term large power surplus,causing rapid frequency rise with spatiotemporal non-uniformity.Conventional center-of-inertia system frequency response models are insufficient for accurately evaluating peak frequency deviations.To address this issue,this paper proposes a two-area impulse-system frequency response(Ip-SFR)model to partition the grid into near-fault and remote areas.Considering tie-line synchronous power coupling and emergency control delays,an analytical frequency-response model is derived and a closed-form expression for the peak frequency deviation is obtained.Furthermore,frequency-security constraints suitable for day-ahead unit commitment is formulated.Case studies show that the proposed method aligns well with time-domain simulations.For typical DC faults at the sending end in Northwest regions,the maximum frequency deviation is reduced from 0.53 Hz/0.49 Hz to 0.44 Hz/0.41 Hz.The proposed approach can provide effective support for online assessment and dispatch optimization.关键词
高比例新能源/直流故障扰动/脉冲频率响应/频率安全稳定Key words
high proportion of renewable energy/DC fault disturbance/impulse frequency response/frequency security and stability引用本文复制引用
张振宇,柯贤波,张钢,王吉利,牛拴保,别朝红,刘诗雨..用于直流送端区域电网频率安全评估的Ip-SFR模型及其应用研究[J].电力系统保护与控制,2026,54(8):82-92,11.基金项目
This work is supported by the National Science and Technology Major Program of China(No.2025ZD0805101). 国家科技重大专项资助(2025ZD0805101) （No.2025ZD0805101）
国家电网公司科技项目资助(5100-202255328A-2-0-YS) （5100-202255328A-2-0-YS）
