| 引用本文: | 张振宇,柯贤波,张 钢,等.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(08):82-92. |
| ZHANG Zhenyu,KE Xianbo,ZHANG Gang,et al.Ip-SFR model for frequency security assessment of DC sending-end regional power grids and its application[J].Power System Protection and Control,2026,54(08):82-92 |
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| 摘要: |
| 随着西北等地区新能源基地与特高压直流外送的快速发展，送端电网呈现弱支撑、强外送特征。换相失败
与直流闭锁等故障可引发短时大功率盈余，导致频率快速上升并呈现时空非一致特性，传统单惯量中心系统频率
响应(system frequency response, SFR)难以准确评估峰值。为此，提出两区域脉冲-系统频率响应(impulse-system
frequency response, Ip-SFR)模型，划分近故障区与远故障区。计及联络线同步功率耦合及稳定控制动作时延，建立
解析频率响应模型并推导峰值频差快速计算式，构建可嵌入日前机组组合的频率安全约束。算例表明，该方法与
时域仿真吻合。西北送端典型直流故障最大频差由0.53 Hz/0.49 Hz降至0.44 Hz/0.41 Hz，可为在线评估与调度优
化提供支撑。 |
| 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 |
| DOI：10.19783/j.cnki.pspc.250951 |
| 分类号: |
| 基金项目:国家科技重大专项 (2025ZD0805101)；国家电网公司科技项目 (5100-202255328A-2-0-YS) |
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| Ip-SFR model for frequency security assessment of DC sending-end regional power grids and its application |
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ZHANG Zhenyu, KE Xianbo, ZHANG Gang, WANG Jili, NIU Shuanbao, BIE Chaohong, LIU Shiyu
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1. School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; 2. Northwest Branch of State Grid Corporation of China, Xi'an 710048, China
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| Abstract: |
| With the rapid expansion of renewable energy bases 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. This paper proposes a two-area impulse-system frequency response 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. Case studies show that the proposed method aligns well with time-domain simulations and can provide effective support for online assessment and dispatch optimization. |
| Key words: high proportion of renewable energy DC fault disturbance impulse frequency response frequency security and stability |
