Verification of the equivalent model of the inverter in microgrid

Microgrid has become the focus of the researchers around the world because of the more emphasis on the flexibility and reliability of power system and low carbon society. Most of the microsources are connected to the microgrid through inverters, thus the modeling of inverter is quite important to the modeling and analysis of microgrid. Considering only the fundamental component of the input and output variables of the inverter, the equivalent model using controlled voltage source and controlled current source is established based on the instantaneous power balance law of the circuit. The validity of the equivalent model is verified through simulations on the platform of MATLAB-Simulink, which is proved to be of high accuracy to imitate the real inverter in both steady and transient state. Based on the equivalent model, two control algorithms are implemented, and the simulation results validate the effectiveness of the equivalent model and the control methods.