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The recently proposed state-of-the-art saturable voltage-behind-reactance (VBR) and phase-domain (PD) synchronous machine models offer improved numerical accuracy and stability compared to the classical qd0 models in electromagnetic transient (EMT or EMTP)-type solution. However, these new models are interfaced with the external network through a variable-parameter (i.e., both rotor-position- and saturation-segment-dependent) interfacing circuit, necessitating refactorizing the entire system conductance matrix at each time step and hindering computational efficiency. This paper extends the previous work by proposing new saturable constant-parameter phase-domain (CPPD) synchronous machine models possessing constant interfacing circuits. The proposed CPPD models are demonstrated in MATLAB and PSCAD/EMTDC and have numerical accuracy similar to other state-of-the-art models while providing considerable computational savings.
Mostajeran et al. (Tue,) studied this question.