| 引用本文: | 李海锋,褚倍钰,梁远升,邓成江,王钢.基于时域卷积功率差的多端混合高压直流线路快速纵联保护方法[J].电力自动化设备,2023,43(6): |
| LI Haifeng,CHU Beiyu,LIANG Yuansheng,DENG Chengjiang,WANG Gang.Fast pilot protection method of multi-terminal hybrid HVDC line based on time-domain differential convolution power[J].Electric Power Automation Equipment,2023,43(6): |
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| 摘要: |
| 针对现有直流线路差动保护速动性不足、双端数据需要严格同步的问题，以三端混合高压直流输电系统为对象，在S域上对不同故障情况下的功率特性进行数学解析，发现利用S域功率差特征可以有效识别区内外故障，并实现故障区域的准确定位；在此基础上，构造了一种时域故障特征量——卷积功率，实现对S域功率特征的有效提取；进而提出了一种基于时域卷积功率差的多端混合高压直流线路快速纵联保护方法。基于PSCAD/EMTDC的仿真验证表明，该方案能在4 ms/10 kHz的时间窗内正确识别区内故障和故障区域，并具有故障选极的特性，无需双端数据严格同步，且具有较高的可靠性、灵敏性及抗干扰能力。 |
| 关键词: 多端混合高压直流 线路保护 卷积功率 纵联保护 继电保护 |
| DOI：10.16081/j.epae.202210005 |
| 分类号:TM77 |
| 基金项目:国家自然科学基金资助项目(52077082)；广东省基础与应用基础研究项目(2022A1515010906) |
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| Fast pilot protection method of multi-terminal hybrid HVDC line based on time-domain differential convolution power |
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LI Haifeng1, CHU Beiyu1, LIANG Yuansheng1, DENG Chengjiang2, WANG Gang1
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1.School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China;2.Guangzhou Branch of China Southern Power Grid Extra High Voltage Power Transmission Company, Guangzhou 510663, China
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| Abstract: |
| In order to solve the problems that the existing direct current(DC) line differential protections are not fast enough and the data of two terminals need to be strictly synchronized, the power characteristics of different faults in S-domain is mathematically analyzed with the three-terminal hybrid high voltage direct current(HVDC) transmission system taken as the object. It is found that using the differential power characteristics in S-domain can effectively distinguish the internal and external faults and accurately locate the fault areas. On this basis, convolution power as a kind of time-domain fault characteristic quantity is constructed to realize the effective extraction of power feature in S-domain, and then a fast pilot protection method for multi-terminal hybrid HVDC line based on differential convolution power is proposed. The simulation based on PSCAD/EMTDC shows that the proposed method can correctly identify the internal faults and locate the fault areas within the data window of 4 ms/10 kHz, and has fault pole selection characteristics, without the need for strict synchronization of data at both ends, and has high reliability, sensitivity and anti-interference ability. |
| Key words: multi-terminal hybrid HVDC line protection convolution power pilot protection relay protection |
