| 摘要: |
| 提出一种潮流转移条件下评价距离后备保护安全性的方法，为及早阻断后续过负荷连锁跳闸发展路径提供支持。首先，根据阻抗测量值与保护动作边界在阻抗平面上的相对位置，量化评价保护躲避过负荷阻抗的能力。在考虑支路传输功率大小的同时，进一步引入支路功率因数角、保护整定值和阻抗元件动作特性信息，提高评价的精准度。其次，将电网突发多重支路切除事件时保护躲避过负荷阻抗能力的最小值，作为潮流转移条件下保护安全性的评价指标，进而将保护安全性评价转化为一个以多重支路切除事件为决策变量的最优化问题，并给出相应的数学模型和基于二进制粒子群算法(binary particle swarm optimization, BPSO)的模型求解方法。实验结果表明，所提方法能够体现支路潮流和保护自身性能对保护安全性的共同影响，更精准地明确保护过负荷跳闸可能发生的初始位置。 |
| 关键词: 后备保护 安全性 潮流转移 过负荷 连锁跳闸 初始位置 |
| DOI：10.19783/j.cnki.pspc.250191 |
| 投稿时间：2025-02-25修订日期：2025-08-19 |
| 基金项目:国家自然科学基金项目资助(52407118) |
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| Security evaluation of distance backup protection under power flow transfer conditions |
| YANG Wenhui1，2,LIU Huiying1 |
| (1. College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China; 2. Hubei
Provincial?Engineering?Technology?Research?Center?for?Microgrid,?China?Three?Gorges?University, Yichang 443002, China) |
| Abstract: |
| A method is proposed to evaluate the security of distance backup protection under power flow transfer conditions, providing support for early interruption of cascading tripping caused by subsequent overload. First, based on the relative position between the measured impedance and the protection operation boundary on the impedance plane, the protection’s ability to avoid overload impedance is quantitatively evaluated. In addition to considering branch transmission power, the method further incorporates factors such as branch power factor angle, protection settings, and operation characteristics of the impedance relay to improve evaluation accuracy. Second, the minimum value of the protection’s ability to avoid overload impedance under multiple simultaneous branch outage events is defined as the evaluation index of protection security under power flow transfer conditions. Consequently, the protection security evaluation problem is transformed into an optimization problem, where multiple branch outage events serve as decision variable. A corresponding mathematical model and a solution approach based on binary particle swarm optimization (BPSO) are developed. Experimental results show that the proposed method effectively captures the combined influence of branch power flow and protection characteristics on overall protection security, allowing for more accurate identification of the initial locations where overload tripping may occur. |
| Key words: backup protection security power flow transfer overload cascading trip initial location |
