| 引用本文: | 杨兴雄,曲延滨,宋蕙慧,等.基于同步挤压小波变换的双馈风电场送出变保护研究[J].电力系统保护与控制,2022,50(12):22-32. |
| YANG Xingxiong,QU Yanbin,SONG Huihui,et al.Wind farm transmission transformer protection based on synchrosqueezed wavelet transform[J].Power System Protection and Control,2022,50(12):22-32 |
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| 摘要: |
| 目前，电力变压器的保护研究及优化多是针对传统电源，少有文献研究双馈风电场电源下计及RSC控制电路的变压器保护。而当双馈风电场并入弱电网时，传统变压器差动保护又存在动作性能变差的问题。基于此，分析了系统发生故障时，计及Crowbar保护电路与计及RSC控制电路的短路电流特性，推导了两种运行条件下短路电流经傅里叶算法提取后的误差表达式。在此基础上，分析了致使传统差动保护性能降低的原因，从而提出利用同步挤压小波变换进行故障特征提取并联合归一化二维轨迹图对故障进行识别并动作的保护新方案。该方案不受风电场短路电流特性的影响，在双馈风电场送出变中具有更好的适用性和更高的精确性。最后，在Matlab/Simulink平台上搭建双馈风电场仿真模型，验证了该方案在不同故障类型、励磁涌流、不同大小噪声及非同步数据传输影响下的有效性。 |
| 关键词: 双馈风机 频率偏移特性 同步挤压小波变换 变压器保护 二维轨迹图 |
| DOI：DOI: 10.19783/j.cnki.pspc. 211229 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(61773137)；山东省自然科学基金项目资助(ZR2019MF030)；中国博士后科学基金项目资助(2018M641830) |
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| Wind farm transmission transformer protection based on synchrosqueezed wavelet transform |
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YANG Xingxiong1, QU Yanbin2, SONG Huihui2, HUANG Kehao1, FAN Xiaohong1
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(1. Kunming University of Science and Technology, Kunming 650500, China;
2. Harbin Institute of Technology (Weihai Branch), Weihai 264200, China)
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| Abstract: |
| At present, protection research and optimization of a power transformer are mostly aimed at the traditional power supply, and there is little work on transformer protection considering an RSC control circuit under the power supply of doubly fed wind farm. When the doubly-fed wind farm is connected to a weak current network, the action performance of the traditional transformer differential protection becomes worse. Based on this, this paper analyzes the characteristics of short-circuit current with a crowbar protection circuit and RSC control circuit when the system fails, and deduces the error expression of short-circuit current extracted by a Fourier algorithm under two operating conditions. The reasons for the degradation of the performance of the traditional differential protection are analyzed, and a new protection scheme is proposed, one which uses a synchronous squeezed wavelet transform to extract the fault features and combines the normalized two-dimensional trajectory diagram to identify and act on the fault. The scheme is not affected by the short-circuit current characteristics of the wind farm. It has better applicability and higher accuracy in the output transformer of a doubly-fed wind farm. Finally, a simulation model of doubly fed wind farm is built on Matlab/Simulink platform to verify the effectiveness of the scheme under the influence of different fault types, inrush current, different noise and asynchronous data transmission.
This work is supported by the National Natural Science Foundation of China (No. 61773137). |
| Key words: doubly-fed induction generator frequency offset characteristics synchrosqueezed wavelet transform transformer protection two-dimensional trajectory figure |
