| 引用本文: | 温志文,贾 科,余 磊,等.基于时频特性相似度的新能源场站T接型送出线路高速保护[J].电力系统保护与控制,2023,51(4):1-11.[点击复制] |
| WEN Zhiwen,JIA Ke,YU Lei,et al.High speed protection based on time-frequency characteristic similarity for a Teed transmission line connected to renewable energy power plants[J].Power System Protection and Control,2023,51(4):1-11[点击复制] |
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| 摘要: |
| 新能源短路电流呈现幅值受限的非工频特征，导致差动保护的动作性能下降。在分析新能源电源与传统同步发电机故障特性的基础上，提出基于时频特性相似度的新能源场站T接型送出线路高速保护原理。该方法首先利用压缩感知压缩高频率采样信号，传输低频率压缩信号，降低保护通信量。然后利用小波变换提取故障电流的时频特征，利用主成分分析法(principal component analysis, PCA)剔除时频特征的冗余信息，得到时频特征矩阵。最后利用堪培拉距离衡量时频特征矩阵相似度，提出基于时频特性相似度的高速保护原理。所提保护理论上可以在故障5 ms内可靠识别区内外故障，具有较强的耐受故障电阻和系统噪声的能力，并且适用于新能源弱出力的场景。硬件在环实验结果和现场录波数据验证了所提保护的有效性。 |
| 关键词: 新能源场站 T接型送出线路 压缩感知 堪培拉距离 高速保护 |
| DOI：10.19783/j.cnki.pspc.220789 |
| 投稿时间：2022-05-24修订日期：2022-08-31 |
| 基金项目:国家自然科学基金项目资助(51725702，52061635102) |
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| High speed protection based on time-frequency characteristic similarity for a Teed transmission line connected to renewable energy power plants |
| WEN Zhiwen,JIA Ke,YU Lei,LIU Xin,KONG Fanzhe,BI Tianshu |
| (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
(North China Electric Power University), Beijing 102206, China) |
| Abstract: |
| The short-circuit current of renewable energy resources presents non power frequency characteristics with limited amplitude, resulting in performance degradation of differential protection. Based on the analysis of the fault characteristics of renewable energy resources and traditional synchronous generators, this paper puts forward a high-speed protection of a Teed line connected to renewable energy power plants. It is based on the similarity of time-frequency characteristics. First, compressed sensing is used to compress the high-frequency sampling signal, transmit low-frequency compressed data and reduce the digital quantity of protection communication. Then wavelet transform is used to extract the time-frequency characteristics of the fault current, and principal component analysis (PCA) is used to eliminate the redundant information of the time-frequency characteristics to obtain the time-frequency characteristic matrix. Finally, Canberra distance is used to measure the similarity of time-frequency characteristic matrices, and a high-speed protection principle based on time-frequency characteristic similarity is proposed. The proposed protection can reliably identify internal and external faults within 5 ms, and has strong ability to withstand fault resistance and system noise. It is also applicable to the scenario of weak output of renewable energy resources. The effectiveness of the proposed protection is verified by a ‘hardware in the loop’ experiment and field recorded data.
This work is supported by the National Natural Science Foundation of China (No. 51725702 and No. 52061635102).
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| Key words: renewable power plant Teed transmission line compressed sensing Canberra distance high speed protection |
