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| Equivalent Circuit Model and Small-Signal Model of Synchronous Generator With 4-Wire Rectifier Load |
| Wei Keyin1, Liu Dezhi1, Ouyang Bin1, Lin Zhaoyang2, Zhai Xiaofei1, Yan Ming1 |
| 1. Naval University of Engineering Wuhan 430033 China 2. Commanding Communications Academy Wuhan 430033 China |
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Abstract A synchronous generator with 4-wire rectifier load operates in an asymmetric mode all the time. In order to perform the analytical solution of performance, the d-and q-axis variables of generator are decomposed into low-and high-frequency components and treated separately. The effects of the rotor resistances on high-frequency currents and the damper windings on low-frequency components are neglected. The equivalent circuit model of synchronous generator with the d-axis sub-transient reactance equal to the q-axis one is developed. The small-signal model of equivalent generator is obtained with linearizing method at the steady-state operation point. The Park's equations, phasor diagram and calculation methods of steady-state variables of equivalent generator are also presented. The developed equivalent circuit model is validated against a generator-rectifier hardware system via experiment and against the detailed model via simulation in PSCAD/EMTDC environment, which proves the correctness of small-signal model too. The circuit model and small-signal model can be respectively used for performance analysis and stability assessment with small disturbance for such systems.
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Received: 31 August 2009
Published: 04 March 2014
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2010, Vol. 25 
