摘要
海上双馈风力发电机(doubly fed induction generator,DFIG)维护困难,对故障辨识精准度要求较陆上更高。转差功率使得DFIG在接近同步速运行工况时,转子绕组匝间故障特征十分薄弱,辨识困难。提出以双侧磁链观测差为特征量的海上DFIG转子绕组匝间短路早期故障的辨识方法。根据DFIG转子绕组匝间短路故障机理,推导得到匝间短路时双侧磁链观测差的表达式。通过仿真验证了该特征量对于转差变化和转速测量误差的鲁棒性。仿真和实验分析结果表明,双侧磁链观测差对于双馈电机转子绕组的早期故障辨识具有高灵敏性和高可靠性,为海上双馈风机转子匝间短路的精确辨识提供技术支撑。
The offshore wind turbine generators(DFIG) are difficult to maintain caused by their low accessibility, so the accuracy of fault identification is higher than onshore DFIGs.The slip power makes the fault characteristics very weak and difficult to identify when DFIGs are close to synchronous speed operation. An identification method was proposed for early faults of inter-turn short-circuit in rotor windings of offshore DFIGs, which was characterized by the differential value of(two-side linkage's observation,TSLO). According to the mechanism of the short-circuit fault in the DFIG rotor windings, the expression of the differential value of TSLO in the inter-turn short circuit was derived. Then the robustness of the fault feature to the slip variation and the rotational speed measurement error is verified by simulation. The simulation and experimental results show that the differential value of TSLO has high sensitivity and high reliability for the early fault identification of the rotor windings in DFIGs, which provides technical support for the accurate identification of the inter-turn short circuit of the rotor windings in DFIGs.
引文
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