Developing Piecewise Damping Terms for the Fifth-Order Generator Model Under Large Disturbances

Abstract It is essential to adopt an appropriate synchronous generator model for power system stability analysis. The fifth-order generator model, which neglects the stator transients, is popular in the power industry. But one key problem with the fifth-order generator model is that it may lead to over-estimation or conservativeness in stability analysis, making it inadequate at times in terms of accuracy. In this article, a piecewise damping term is proposed and developed into the fifth-order generator model, which can greatly improve the stability analysis accuracy when the fifth-order generator model is employed. An iterative method for calculating the damping coefficient of the piecewise damping term is proposed and validated via numerical studies on two test systems. The regularity of the proposed piecewise damping coefficient under different dynamic conditions is investigated. Practical applications of the proposed piecewise damping terms are presented.

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