Damping Representation for the Fifth-Order Generator Model in Transient Behaviors
Damping Representation for the Fifth-Order Generator Model in Transient Behaviors
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DOI：
10.1109/tpwrs.2017.2682902
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发表时间：
2017-03
影响因子：
6.6
通讯作者：
Ningqiang Jiang;H. Chiang
中科院分区：
文献类型：
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作者：
Ningqiang Jiang;H. Chiang
为了减小发电机五阶模型和七阶模型之间的差异，推导了补偿转矩的表达式。该方法是在保持电压方程和磁链方程不变的情况下，将其附加到五阶模型的摆幅方程中。基于奇异摄动理论，对定子暂态过程进行了近似。三个转子绕组的快速电流分量由产生相同定子磁链的等效d轴和q轴定子电流增量表示。从物理的角度阐明了该扭矩和阻尼之间的关系。两个系统的仿真结果表明，补偿力矩减小了模型差异。所提出的阻尼保持模型克服了阻尼转矩系数难以确定的困难，适用于在线暂态稳定分析。
An expression of the compensation torque is derived to reduce the difference between the fifth-order generator model and the seventh-order model. It is appended to the swing equation in the fifth-order model, with the voltage equations and the flux linkage equations unchanged. Based on the singular perturbation theory, the stator transients are approximated. The fast current components of three rotor windings are represented by equivalent d- and q-axis stator current increments that create the same stator flux linkage. The relationship between this torque and damping is clarified from a physical viewpoint. Simulations on two systems show that the compensation torque reduces the model difference. The proposed damping preserving model overcomes the difficulty in determining the damping torque coefficient and is applicable to online transient stability analysis.