| 涌流引起换流变压器零序过电流保护误动的机理分析及对策 |
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| 引用本文： | 翁汉琍,刘雷,林湘宁,金能,李振兴,黄景光.涌流引起换流变压器零序过电流保护误动的机理分析及对策[J].电力系统自动化,2019,43(9):171-178. |
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| 作者姓名： | 翁汉琍 刘雷 林湘宁 金能 李振兴 黄景光 |
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| 作者单位： | 梯级水电站运行与控制湖北省重点实验室(三峡大学),湖北省宜昌市,443002;强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市,430074 |
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| 基金项目： | 国家自然科学基金资助项目(51607106) |
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| 摘 要： | 针对高压直流输电工程中换流变压器空载合闸及外部故障切除引起零序过电流保护误动的案例,分析了换流变压器空投和外部故障切除时励磁涌流及恢复性涌流的变化特点及其对零序电流的影响机理。采用基于工程实际参数的高压直流输电的仿真模型,对高压换流站换流变压器空投及外部故障切除导致中性线零序电流幅值较大且衰减缓慢的现象进行了仿真分析,揭示了换流变压器零序过电流保护误动的原因。利用相空间重构技术提出了基于零序电流相空间分布重心幅值变化特征的换流变压器零序过电流保护闭锁新判据,并通过仿真验证了该方案的有效性。
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| 关 键 词： | 换流变压器 零序过电流保护 涌流 相空间重构 重心分布 |
| 收稿时间： | 2018/4/23 0:00:00 |
| 修稿时间： | 2019/1/15 0:00:00 |
Mechanism and Countermeasures of Mal-operation of Converter Transformer Zero-sequence Overcurrent Protection Caused by Inrush Currents |
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| WENG Hanli,LIU Lei,LIN Xiangning,JIN Neng,LI Zhenxing and HUANG Jingguang.Mechanism and Countermeasures of Mal-operation of Converter Transformer Zero-sequence Overcurrent Protection Caused by Inrush Currents[J].Automation of Electric Power Systems,2019,43(9):171-178. |
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| Authors: | WENG Hanli LIU Lei LIN Xiangning JIN Neng LI Zhenxing and HUANG Jingguang |
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| Affiliation: | Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station(China Three Gorges University), Yichang 443002, China,Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station(China Three Gorges University), Yichang 443002, China,State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology), Wuhan 430074, China,State Key Laboratory of Advanced Electromagnetic Engineering and Technology(Huazhong University of Science and Technology), Wuhan 430074, China,Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station(China Three Gorges University), Yichang 443002, China and Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station(China Three Gorges University), Yichang 443002, China |
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| Abstract: | Aiming at the mal-operations of the zero-sequence overcurrent protection due to the energization of unloaded converter transformers and the removal of external fault in the HVDC transmission project, the variation characteristics of the two inrush currents and their influences on the zero-sequence current are analyzed. The phenomenon that the zero-sequence current is provided with quite high magnitude and decays slowly during the two inrush currents is simulated. The reason of the mal-operation of the zero-sequence overcurrent protection is revealed. Taking advantages of the phase space reconstruction technique, this paper proposes a novel blocking criterion of the zero-sequence overcurrent protection, which is based on the center-of-gravity amplitude of the phase space distribution of the zero-sequence current. The effectiveness of the proposed criterion is verified by means of simulation tests. |
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| Keywords: | converter transformer zero-sequence overcurrent protection inrush current phase space reconstruction distribution of center-of-gravity |
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