Switching function based inverter modeling for a grid-connected SOFC system in real time

Abstract

This paper presents a switching function based modeling of a three-phase voltage source inverter along with hysteresis current control loop, which uses two-axis synchronously rotating reference frame for a grid-connected solid oxide fuel cell, SOFC system. In comparison to detailed inverter model, this inverter model gives the reduced simulation time while keeping the total harmonic distortion within limit as per the latest grid code and at the same time it maintains the required accuracy. All this is accomplished using MATLAB/SIMULINK environment. Further, a one stage ahead has been developed for the researchers by transforming this inverter model into real time model using OPAL-RT’s simulator with hardware-in-loop technology for its implementation in actual power system.