An Improved Method for Incorporating Magnetic Saturation in the Q-d Synchronous Machine Model

Keith Corzine, Missouri University of Science and Technology
Brian T. Kuhn
S. D. Sudhoff
H. J. Hegner

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An improved technique for incorporating saturation into the q-d axis model (Park''s model) of a synchronous machine is proposed. By choosing magnetizing flux linkage as a state variable, iterative procedures required by traditional methods are avoided. The saturation function is represented by an arctangent function which has some distinct advantages over polynomial representations and look-up tables. In particular, the parameters of the proposed function all have physical significance and the proposed function is defined over an infinite range of flux linkage. The model is verified for steady-state and transient conditions using a laboratory synchronous machine-rectifier system similar to those commonly used for naval and aerospace power generation