摘要
伴随着风能的大规模应用，双馈发电机（DFIG）在风电机组内的应用愈发常见，不过在长期运行期间诸如发电机轴电流之类的问题逐步凸显，给机组的稳定性和运行效率带来了不良影响。轴电流大多是由变流器产生的高频电压尖峰，借助电容耦合至转子轴从而对轴承形成损害。本文对双馈风电机组的轴电流和接地问题予以剖析，并给出了对应的监测、预警、维修办法以及接地系统设计的优化方案，通过这些技术措施能够提高风电机组的运行稳定性与可靠性。
关键词： 双馈发电机；轴电流；轴电压；发电机接地；监测系统；预警策略
Abstract
With the large-scale application of wind energy, the application of doubly-fed generator (DFIG) in wind turbines has become more and more common. However, during the long-term operation, problems such as generator shaft current have gradually become prominent, which has brought adverse effects on the stability and operation efficiency of wind turbines. The shaft current is mostly a high-frequency voltage spike generated by the converter, which is coupled to the rotor shaft by means of capacitance, thus damaging the bearing. In this paper, the shaft current and grounding problems of doubly-fed wind turbine are analyzed, and the corresponding monitoring, early warning, maintenance methods and optimization scheme of grounding system design are given. These technical measures can improve the stability and reliability of wind turbine operation.
Key words： Double-fed generator; Axial current; Shaft voltage; Generator grounding; Monitoring system; Early warning strategy
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