A Load Model to Reduce Computational Effort in Real-Time Simulation of Asymmetrical Short Circuits

Transient analyses of electrical networks demand highly accurate models to represent component behavior precisely, thereby increasing the computational burden of simulations. This aspect becomes critical when conducting real-time simulations, such as Hardware-in-the-Loop, as the computational weight of the models can make some case studies unfeasible and require increasingly powerful devices, significantly raising the cost of real-time test systems. This paper proposes a low computational cost approach to model single-phase dynamic resources for stationary and dynamic power system analyses. The strategy is based on the instantaneous p-q theory and avoids heavy blocks/calculations such as Root-Mean-Square, Phase-Locked-Loop, and abc-dq0 coordinate transformations. Moreover, a Single-Phase P-Q Theory-based Dynamic Load model is introduced and validated on Matlab/Simulink platform under severe transient network conditions, namely LG and LL asymmetrical short circuits. The model is compared with static and dynamic load models of the simulation platform.