Implementation of constant-parameter directly-interfaced VBR synchronous machine models in SimPowerSystems, ASMG, and PLECS toolboxes

This paper presents the implementation of a constant-parameter voltage-behind-reactance (CP-VBR) synchronous machines model that can be directly interfaced in most state-variable-based transient simulation programs. The stator is interfaced using constant and decoupled RL branches, and the rotor equations are expressed in state-space form to facilitate their implementation. The proposed model accommodates salient or round rotor machines, and its implementation is shown in three popular MATLAB/Simulink toolboxes: SimPowerSystems, ASMG, and PLECS. The presented studies compare the efficiency and accuracy of the CP-VBR models with the classical qd0 model. It is demonstrated that the CP-VBR models are faster, have higher accuracy, and are easy to implement. Additionally, the limitations of each toolbox for the simulation of different scenarios are discussed. It is also noted that the built-in toolbox models do not include zero-sequence, which may limit their application and make them invalid for some studies.