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Influence of Different Practical Models on the First Swing Stability of Turbine Generators

机译：不同实践模型对汽轮发电机初摆稳定性的影响

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摘要

There are two popular practical models of synchronous generators used in power system simulation, both based on Park equations, defined as assumed A and assumed B respectively, according to the different assumptions. To study the influence of the different models on the first swing stability calculation precision, the physical essence of the two assumptions are revealed in theory, and it is obtained that assumed A takes account of the mutual leakage flux linkage between field and damping windings and neglects the self-leakage flux linkage of damping winding, the opposite of assumed B. Taking a 300-MW turbine generator as an example, first swing stability limits calculated by two practical models are compared; simulation results are verified by the time-step finite-element model. The influence of line reactance and excitation system on first swing stability limits is studied. Results show that the first swing stability limit calculated by the practical model with assumed A is closer to the result of the time-step finite-element model, since assumed A takes account of the larger mutual leakage flux linkage. Therefore, the practical model with assumed A is more accurate. The result provides reasonable reference to select synchronous generator models in power system simulation.
机译：电力系统仿真中有两种流行的同步发电机实用模型，均基于Park方程，根据不同的假设分别定义为假设A和假设B。为了研究不同模型对第一摆动稳定性计算精度的影响，在理论上揭示了两个假设的物理本质，并得出假设A考虑了励磁绕组与阻尼绕组之间的互漏磁链，而忽略了以阻尼绕组的自漏磁链为例，与假定的B相反。以300 MW汽轮发电机为例，比较了两个实际模型计算的第一回转稳定极限。通过时步有限元模型验证了仿真结果。研究了线路电抗和励磁系统对第一摆动稳定性极限的影响。结果表明，由于假设A考虑了较大的互泄漏通量，因此，在假设A的情况下，由实际模型计算的第一摆动稳定性极限值更接近于时步有限元模型的结果。因此，假设A的实际模型更为准确。该结果为电力系统仿真中选择同步发电机模型提供了合理的参考。

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