| 引用本文: | 赵 耀,高泽华,李东东,等.基于柔性合环装置SAPST的配电网自适应电流保护研究[J].电力系统保护与控制,2025,53(10):176-187.[点击复制] |
| ZHAO Yao,GAO Zehua,LI Dongdong,et al.Research on adaptive current protection for distribution networks based on flexible loop closing device SAPST[J].Power System Protection and Control,2025,53(10):176-187[点击复制] |
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| 摘要: |
| 使用单芯不对称移相变压器(single-core asymmetric phase shifting transformer, SAPST)进行柔性合环操作可提高传统配电网合环成功率。但SAPST本身复杂的结构和本体特性增加了保护装置配置的复杂性，易引起保护装置拒动、误动，降低保护灵敏度。针对上述问题，提出一种含SAPST合环网络自适应电流保护方法。首先，建立含SAPST合环网络的等值模型，分析SAPST接入对传统电流保护的影响机理。然后，基于SAPST挡位信息，利用故障复合序分量关系计算短路电流构建I段保护方案，通过调整分支系数构建II段保护方案。同时设计保护方案切换判据以实时评估合环状态，并制定合环保护方案流程图。最后，基于PSCAD/EMTDC以及RTlab半实物仿真平台对所提保护方案进行验证。实验结果表明，所提方案具有较高的选择性与可靠性，为SAPST的工程应用提供了理论支撑。 |
| 关键词: 配电网 单芯不对称 移相变压器 柔性合环 自适应电流保护 |
| DOI：10.19783/j.cnki.pspc.241033 |
| 投稿时间：2024-08-02修订日期：2025-03-03 |
| 基金项目:国家自然科学基金项目资助(52377111)；西藏自治区科技项目资助(XZ202401ZY0037)；教育部春晖计划合作科研项目资助(HZKY20220084) |
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| Research on adaptive current protection for distribution networks based on flexible loop closing device SAPST |
| ZHAO Yao,GAO Zehua,LI Dongdong,HE Yiyang,LI Chengzhi,XU Jiangjiao |
| (College of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China) |
| Abstract: |
| Flexible loop closing using single-core asymmetric phase shifting transformer (SAPST) can improve the success rate of traditional distribution network loop closures. However, the complex structure and intrinsic characteristics of SAPST increase the complexity of configuring protection devices, which may lead to malfunction or failure of protection actions and reduce protection sensitivity. To address these issues, an adaptive current protection method for loop closing networks employing SAPST is proposed. First, an equivalent model of the loop closing network containing SAPST is established, and the mechanism by which SAPST affects traditional current protection is analyzed. Then, based on the SAPST tap position information, a stage-I protection scheme is developed by calculating the short-circuit current using the fault compound sequence component relationships. A stage-II protection scheme is established by adjusting the branch coefficients. Additionally, switching criteria for protection schemes are designed to evaluate the loop closing status in real-time, and a flowchart for the loop closing protection scheme is proposed. Finally, the proposed protection scheme is verified using PSCAD/EMTDC and the RTlab hardware-in-the-loop simulation platforms. Experimental results demonstrate that the proposed scheme offers high selectivity and reliability, providing theoretical support for the engineering application of SAPST. |
| Key words: distribution network single-core asymmetric phase shifting transformer flexible loop closing adaptive current protection |
