Nonlinear model of synchronous generator for autonomous electrical power systems analysis

This paper presents the nonlinear lookup table model for synchronous generator (SG) analysis. The saturation effects of the SG magnetic circuit have been considered. The saturated characteristic of the SG magnetic circuit are based on the open circuit saturation curve for magnetizing inductances. The model has been implemented into the Synopsys/Saber software using the MAST modelling language. To implement the no-load voltage characteristic of SG into the MAST model the table look-up tool has been used. Normal and fault operation of SG can be effectively studied. Developed model exhibits a network with the same number of external terminals as the real SG and represents its behaviour in terms of the electrical and mechanical variables as well. Accuracy and robustness of the nonlinear lookup table modelling approach has been confirmed by measurements performed on the 3 kVA synchronous generator.