| 引用本文: | 寇凌岳,王耀函,刘永欢,宁联辉,吴林林,龚超,张峻源.低频风电系统故障快速识别及故障控制策略[J].电力自动化设备,2026,46(2):85-93. |
| KOU Lingyue,WANG Yaohan,LIU Yonghuan,NING Lianhui,WU Linlin,GONG Chao,ZHANG Junyuan.Rapid fault identification and fault control strategy in low-frequency wind power system[J].Electric Power Automation Equipment,2026,46(2):85-93. |
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| 摘要: |
| 工/低频交流故障的快速定相与穿越技术是保障低频风电系统安全稳定运行的关键。分析广东某1 GW风电场低频单通道送出设计场景下的电压电流波形特性，提取故障后电压电流信号的突变特征量，分别设计启动判据Ⅰ、Ⅱ，实现故障的快速识别与定相；针对工频侧故障期间系统动态过程，根据风电场电压穿越标准设计辅助控制器，动态调整有功/无功电流参考值，实现模块化多电平矩阵式换流器(M3C)联合风电场的高/低电压穿越；针对低频侧三相对称故障，以避免M3C退出运行为优先，提出无闭锁故障穿越控制；针对低频侧单相故障，采用抑制有功功率直流分量为0的故障穿越控制。仿真结果表明所提检测方案能够在3 ms内实现故障的识别与定相，在此之后系统能够针对不同的故障选择相应的穿越控制，保证M3C平均子模块电容电压的稳定，实现系统的安全可靠运行。 |
| 关键词: 低频输电 模块化多电平矩阵式换流器 海上风电 故障识别 故障定相 故障穿越 |
| DOI：10.16081/j.epae.202509009 |
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| 基金项目:国网冀北电力有限公司科技项目新能源低频发电运行特性与评价技术研究(B3018K230007) |
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| Rapid fault identification and fault control strategy in low-frequency wind power system |
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KOU Lingyue1, WANG Yaohan2, LIU Yonghuan3, NING Lianhui3, WU Linlin2, GONG Chao2, ZHANG Junyuan3
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1.State Grid Jibei Electric Power Co.,Ltd.,Beijing 100053, China;2.State Grid Jibei Electric PowerCo.,Ltd. Research Institute, Beijing 100034, China;3.School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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| Abstract: |
| The rapid phase identification and ride-through technology of power-/low-frequency AC fault are critical to ensuring the secure and stable operation of low-frequency wind power system. The voltage and current waveform characteristics of a 1 GW wind farm in Guangdong under a low-frequency single-channel delivery design scenario is analyzed. By extracting transient features from post-fault voltage and current signals, Starting Criteria Ⅰ and Ⅱ are designed to achieve rapid identification and phase determination of fault. Furthermore, for the dynamic process during the system fault period at power-frequency side, an auxiliary controller is developed based on voltage ride-through standards of wind farm, enabling dynamic adjustment of active and reactive current references to coordinate modular multilevel matrix converter(M3C) and wind farms for high-and low-voltage ride-through. For the symmetrical three-phase fault at low-frequency side, a blocking-free ride-through control strategy is proposed to prevent M3C shutdown as a priority. For the single-phase fault at low-frequency side, a fault ride-through strategy suppressing the DC component of active power to zero is implemented. The simulative results demonstrate that the proposed detection scheme achieves fault identification and phase determination within 3 ms, so that the system can select the corresponding ride-through control for different faults, maintain the stability of the average capacitor voltage of M3C submodule, and ensure the secure and reliable operation of the system. |
| Key words: low-frequency transmission modular multilevel matrix converter offshore wind power fault identification fault phase determination fault ride-through |
