Minimum-Threshold Crowbar for a Fault-Ride-Through Grid-Code-Compliant DFIG Wind Turbine
Minimum-Threshold Crowbar for a Fault-Ride-Through Grid-Code-Compliant DFIG Wind Turbine
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DOI：
10.1109/tec.2010.2046492
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发表时间：
2010-06
影响因子：
4.9
通讯作者：
G. Pannell;D. Atkinson;B. Zahawi
中科院分区：
文献类型：
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作者：
G. Pannell;D. Atkinson;B. Zahawi
双馈感应发电机(DFIG)技术是不断增长的全球风力发电市场的主导技术，因为它结合了变速运行和经济高效的部分额定功率转换器。然而，DFIG对电源电压的下降非常敏感，如果没有针对电网故障的特殊保护，DFIG就有可能因过电流和/或过电压而损坏其功率转换器。传统的变流器保护采用转子-撬棒闭合回路，功率输出较差，定子电压持续受到抑制。本文提出了一种新的最小阈值转子-撬棒方法，通过将撬棍的施加周期缩短到11-16ms来提高故障响应，成功地转移了暂态过电流，并在故障开始和清除后45ms内恢复了良好的功率控制，从而使DFIG能够满足电网编码故障穿越的要求。使用7.5千瓦的测试设备对新方法进行了实验验证和评估。
Doubly fed induction generator (DFIG) technology is the dominant technology in the growing global market for wind power generation, due to the combination of variable-speed operation and a cost-effective partially rated power converter. However, the DFIG is sensitive to dips in supply voltage and without specific protection to “ride-through” grid faults, a DFIG risks damage to its power converter due to overcurrent and/or overvoltage. Conventional converter protection via a sustained period of rotor-crowbar closed circuit leads to poor power output and sustained suppression of the stator voltages. A new minimum-threshold rotor-crowbar method is presented in this paper, improving fault response by reducing crowbar application periods to 11-16 ms, successfully diverting transient overcurrents, and restoring good power control within 45 ms of both fault initiation and clearance, thus enabling the DFIG to meet grid-code fault-ride-through requirements. The new method is experimentally verified and evaluated using a 7.5-kW test facility.