Sequence component models to calculate fault current contributions from wind generators

序列分量模型计算风力发电机故障电流贡献摘要本研究的目的是建立新的双馈感应风力发电机动态序列分量模型，以计算大型风力发电厂到电网故障的正序、负序和零序电流。该方法是利用精确的机械和电力电子模型在时域模拟这些故障，并在频域建立它们的序列分量模型。保护继电器测量序列分量电流，但直到现在，公用事业保护工程师还不能准确地计算风力发电厂连接到公用事业网络的节点上的继电器设置。当风力发电机电路拓扑结构在毫秒范围内发生变化时，有必要建立时变或动态序列组件模型，并将这些信息用于继电器设置将是电力工程的一个全新领域。这种方法也可以应用于其他三相系统和机器，甚至导致全新的继电器设计。可靠和安全的电力是社会的支柱。不正确的继电器设置基于不正确的序列建模，可能导致中断故障失败，或导致讨厌的电源跳闸。未能中断可能会导致人身伤害或严重的设备损坏。研究结果将通过出版物和各种IEEE工作组传播，并包括在Harley博士教授的电机研究生课程中。来自佐治亚理工学院机会学者计划（OSP）的两名本科少数民族学生将参与其中。

SEQUENCE COMPONENT MODELS TO CALCULATE FAULT CURRENT CONTRIBUTIONS FROM WIND GENERATORSABSTRACTThe objective of this research is to develop new dynamic sequence component models for doubly-fed induction wind generators in order to calculate the positive, negative and zero sequence currents from such large wind plants to a grid fault. The approach is to simulate these faults in the time domain using accurate machine and power electronic models, and develop their sequence component models in the frequency domain. Protection relays measure the sequence component currents, but until now utility protection engineers have not been able to accurately calculate relay settings at the nodes where wind plants are connected to the utility network. When the wind generator circuit topology changes within the milli-second range, it is necessary to have time varying or dynamic sequence component models based and adapting this information to relay settings will be a fundamentally new area to power engineering. This method could also be applied to other three phase systems and machines, and even lead to completely new relay designs. Reliable and secure electricity is the backbone of society. Incorrect relay settings based on incorrect sequence modeling, can lead to failure to interrupt faults, or to nuisance tripping of the power. Failure to interrupt could in turn lead to personal injury, or severe damage to equipment. The results will be disseminated through publications and various IEEE Working Groups, and included in a graduate level course on electrical machines taught by Dr. Harley. Two undergraduate minority students from the Opportunity Scholars Program (OSP) at Georgia Tech will be involved.