| 引用本文: | 高淑萍,宋晓辰,宋国兵.基于VMD能量熵的混合双端直流输电线路纵联保护方案[J].电力系统保护与控制,2022,50(14):123-132.[点击复制] |
| GAO Shuping,SONG Xiaochen,SONG Guobing.Longitudinal protection scheme of hybrid double-terminal DC transmission linesbased on VMD energy entropy[J].Power System Protection and Control,2022,50(14):123-132[点击复制] |
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| 摘要: |
| 为提高混合双端高压直流输电线路故障快速清除能力，确保输电系统安全运行，提出了一种基于变分模态分解(Variational Mode Decomposition, VMD)能量熵的混合双端直流输电线路纵联保护方法。根据高压直流输电线路边界元件两侧的电压能量不同，同时考虑故障类型以及过渡电阻的影响，构造了电压故障分量的能量熵保护方案。将故障时测量点采集的电压故障分量进行VMD分解，得到若干固有模态分量并计算能量熵。根据区内外故障时电压故障分量的能量熵大小不同构造区内外故障判据，由正负极电压故障分量的能量熵之比构造故障极判据。通过PSCAD/EMTDC建模仿真，并利用Matlab结合保护判据对该方法进行验证。结果表明，该保护方法快速性好、可靠性高、耐过渡电阻能力强。 |
| 关键词: 混合双端直流输电系统 继电保护 故障 变分模态分解 能量熵 |
| DOI：DOI: 10.19783/j.cnki.pspc.211115 |
| 投稿时间：2021-08-17修订日期：2021-12-13 |
| 基金项目:国家自然科学基金面上项目资助(51777166)；国家自然科学基金联合基金重点支持项目资助(U1766209)；中国国家留学基金项目资助 |
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| Longitudinal protection scheme of hybrid double-terminal DC transmission linesbased on VMD energy entropy |
| GAO Shuping,SONG Xiaochen,SONG Guobing |
| (1. College of Electrical and Control Engineering, Xi'an University of Science and Technology, Xi'an 710054, China;
2. School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China) |
| Abstract: |
| To improve the quick fault clearing ability of hybrid dual-terminal HVDC transmission lines and ensure the safe operation of the transmission system, a hybrid dual-terminal HVDC transmission line longitudinal protection method based on variational mode decomposition energy entropy is proposed. Given the different voltage energy on both sides of HVDC boundary elements, and considering the fault types and the influence of transition resistance, a protection scheme of energy entropy of the voltage fault component is constructed. The voltage fault components are collected at measurement points when faults are decomposed by VMD to obtain some inherent modal components and calculate the energy entropy. The fault criteria are constructed according to the values of energy entropy of the voltage fault components in and out of the zone, and a fault pole criterion is constructed according to the ratio of the energy entropy of the components in and out of the zone. The method is verified using PSCAD/EMTDC modeling and simulation, Matlab and protection criteria. The results show that the protection method is fast, and has high reliability and strong resistance to transition resistance.
This work is supported by the General Program of National Natural Science Foundation of China (No. 51777166). |
| Key words: hybrid double-ended DC transmission system relay protection fault variational mode decomposition energy entropy |
