Modeling, analysis, and design of stationary reference frame droop controlled parallel three-phase voltage source inverters

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In this paper, a grid simulator based on a back-to-back inverter topology with resonant controllers is presented. The simulator is able to generate three-phase voltages for a range of amplitudes and frequencies with different types of perturbations, such as voltage sags, steady state unbalanced voltages, low order harmonics and flicker. The aim of this equipment is to test the performance of a given system under such distorted voltages. A prototype of the simulator, consisting of two inverters connected back-to-back to a 380 V three-phase grid and feeding a micro-grid composed of two inverter interfaced distributed generators and a critical load was built and tested. A set of experimental results for linear purely resistive loads, non-linear loads and current controlled inverters is presented to prove the capabilities of the simulator. Finally, a case study is presented by testing a micro-grid.

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