Transient analysis of an inverter based source operating in microgrids

Traditional microgrids have sources whose transient response is limited by process or mechanical time constants depending on the technology used. Inverter based sources provide the flexibility in designing and tuning the controller parameters so as to operate microgrid within specified constraint in voltage and frequency. For this it is imperative to investigate the effect of controller parameters and different operating conditions on inverter response and define the response in terms of standard transient parameters such as damping, natural frequency and inertia. In this work a methodology has been defined to model the inverter based source as voltage magnitude and phase transfer function. Effect of controller and filter parameters as well as different operating conditions on low, medium and high frequency inverter transients is then obtained and analyzed. Simulation of an inverter based source, is done using Simulink/MATLAB software to validate the analysis.