UBC Theses and Dissertations

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UBC Theses and Dissertations

Constant-parameter direct interfacing of saturable synchronous machine models for electromagnetic transient programs Mostajeran, Erfan


In today’s wider adaptation of renewable energy resources, computer simulations and power system transient studies play a vital and enabling role. For conducting the power system studies, the nodal-analysis-based electromagnetic transient program (EMT or EMTP)-type simulators have been widely accepted and used by researchers and engineers as the industry standard tools, wherein the synchronous machines are commonly represented by the general-purpose lumped-parameter models. The traditional machine models are expressed in qd0 coordinates, which represents a challenge when interfacing with external networks that are represented in abc physical variables and coordinates, often making the machine models the computational bottleneck of computer simulations. This thesis advances the state-of-the-art and develops computationally-efficient and accurate models of synchronous machines for EMTP-type solutions. To enhance the modelling fidelity, the main flux magnetic saturation is considered. Two groups of models are proposed based on voltage-behind-reactance (VBR) and phase-domain (PD) methodologies, respectively. The previously established models of this type possess rotor-position- and saturation-dependent interfacing circuit, which requires costly refactorization of the entire network conductance matrix at each time step. The new VBR and PD models are proposed that have a constant interfacing conductance matrix. Extensive computer studies demonstrate the superiority of the proposed models in terms of computational efficiency compared to other state-of-the-art models. It is envisioned that the new models will become adopted by many standard offline and real-time EMTP simulators.

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