| 引用本文: | 高淑萍,周永宁,王晨清,等.基于差动正序分量波形相似度的海上风电低频输电线路保护方法[J].电力系统保护与控制,2025,53(11):95-104.[点击复制] |
| GAO Shuping,ZHOU Yongning,WANG Chenqing,et al.Protection method for offshore wind power low-frequency transmission lines based on differential positive-sequence component waveform similarity[J].Power System Protection and Control,2025,53(11):95-104[点击复制] |
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| 基于差动正序分量波形相似度的海上风电低频输电线路保护方法 |
| 高淑萍1,2,周永宁1,2,王晨清3,陈实3,宋国兵4,权喆1,2 |
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| (1.西安科技大学电气与控制工程学院，陕西 西安 710054;2.西安市电气设备状态监测与供电安全重点实验室，
陕西 西安 710054;3.国网江苏省电力有限公司电力科学研究院，江苏 南京 211103;
4.西安交通大学电气工程学院，陕西 西安 710049) |
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| 摘要: |
| 海上风电低频输电线路故障受双侧电力电子换流器控制策略影响，其故障特征以及对传统保护的影响较为复杂。基于双端换流器控制策略和故障复合序网，从理论上分析传统电流差动保护的适应性，得到存在拒动风险的结论。结合故障后电压、电流波形特点，提出基于差动正序分量波形相似度的保护方法。该方法首先提取线路两侧保护安装处电流与电压的故障分量，利用对称分量法得到故障分量所对应差动电流与差动电压的正序分量，对正序差动电压进行修正。然后，利用改进余弦相似度计算差动电流与修正差动电压正序分量的相关程度，通过相关性的差异来识别区内、外故障。最后，在PSCAD中搭建了海上低频输电系统模型，对线路中发生不同故障位置、故障类型、不同过渡电阻和采样频率的故障情况进行分析，验证了所提保护方法的快速性和有效性。 |
| 关键词: 海上风电 低频输电系统 线路保护 对称分量法 改进余弦相似度 |
| DOI：10.19783/j.cnki.pspc.241195 |
| 投稿时间：2024-09-05修订日期：2025-01-21 |
| 基金项目:陕西省自然科学基金面上项目资助(2024JC-YBMS-792)；国家电网有限公司总部科技项目资助(52094020006U) |
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| Protection method for offshore wind power low-frequency transmission lines based on differential positive-sequence component waveform similarity |
| GAO Shuping1,2,ZHOU Yongning1,2,WANG Chenqing3,CHEN Shi3,SONG Guobing4,QUAN Zhe1,2 |
| (1. School of Electrical and Control Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;
2. Xi’an Key Laboratory of Electrical Equipment Condition Monitoring and Power Supply Security, Xi’an 710054, China;
3. State Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, China;
4. School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China) |
| Abstract: |
| Fault characteristics in offshore wind power low-frequency transmission lines are significantly affected by the control strategies of power converters on both ends, making fault behavior and its impact on traditional protection schemes complex. Based on the control strategy of the converters at the two ends and the fault composite sequence network, this paper theoretically analyzes the applicability of conventional current differential protection and concludes that there is a risk of malfunction or failure to operate. Based on the characteristics of voltage and current waveforms after faults, a protection method based on the waveform similarity of the positive-sequence differential components is proposed. This method first extracts the fault components of current and voltage at the protection installation points on both sides of the line. The symmetrical component method is then used to obtain the positive-sequence components of the differential current and voltage, and the positive sequence differential voltage is corrected accordingly. Then, an improved cosine similarity measure is used to calculate the correlation between the positive sequence components of the differential current and the corrected differential voltage, while the difference in correlation is used to distinguish between internal and external faults. Finally, a PSCAD offshore low-frequency transmission system model is built, and fault scenarios with various fault locations, types, transition resistances, and sampling frequencies are analyzed. The results verify the speed and effectiveness of the proposed protection method. |
| Key words: offshore wind power low-frequency transmission system line protection symmetrical component method improved cosine similarity |
