Analysis on the Simplified Simulation and Modelling Tech of the Microgrid Based on Thévenin-Norton Equivalent Model

Abstract

This paper proposes a simplified simulation and modelling tech for microgrid. This method can save simulation time and computational memory, compared with the simulation of the detail model. Firstly, the grid-tied inverter, the integrated load, and the nonlinear load in microgrid are analyzed and modeled. Next, their models are simplified as Thévenin-Norton equivalent models. Moreover, the consistency between hardware equivalent model and control equivalent model of power electronics devices is proved. Finally, the correctness of the simplified simulation and modelling tech is confirmed during voltage sag in the improved IEEE 13 Node Test Feeder system in MATLAB/SIMULINK. The results show that the outputs characteristics of the simplified models are consistent with those of their detailed models.