Abstract The large-scale integration of different kinds of wind farms (WFs) in a transmission grid can bring special adaptability issues to the traditional phasor-based line differential protection in both the transient and steady states. In this paper, a novel composite fault model based differential protection (CFMDP) is proposed. The CFMDP detects the fault status by evaluating the consistency between the sampled fault data and the pre-defined differential model. Since the full-frequency fault information in time-domain is directly used in the consistency calculation, the CFMDP method performs better transient behaviours than the conventional scheme. Besides, the compensated currents are used to build the differential model, which overcomes the 'over angle difference' caused steady-state adaptability issue in the phasor based differential relay. This steady-state protective issue mainly happens with the interphase faults in large-scale Type-IV wind turbine generators (WTGs) integrated power grid. The electro-magnetic transient (EMT) simulation results demonstrate the effectiveness and merits of the proposed CFMDP schemes.

中文翻译：

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基于模型识别和非对称矢量重构的风电场连接输电线路新型差动保护

摘要 输电网中不同类型风电场（WF）的大规模集成给传统的基于相量的线路差动保护在暂态和稳态方面带来了特殊的适应性问题。在本文中，提出了一种新的基于复合故障模型的差动保护（CFMDP）。CFMDP 通过评估采样的故障数据与预先定义的差分模型之间的一致性来检测故障状态。由于时域全频故障信息直接用于一致性计算，CFMDP方法比传统方案具有更好的瞬态行为。此外，补偿电流用于建立微分模型，克服了“过角差” 在基于相量的差动继电器中引起稳态适应性问题。这种稳态保护问题主要发生在大型 IV 型风力涡轮发电机 (WTG) 集成电网中的相间故障。电磁瞬态 (EMT) 仿真结果证明了所提出的 CFMDP 方案的有效性和优点。