Achieving Zero Steady State Error on Voltage Source Inverters with Sinusoidal References using a RST Polynomial Controller

This work presents an application of RST polynomial controllers to a Voltage Source Inverter, in order to achieve zero steady-state error while tracking a sinusoidal reference. The theory of RST controllers is presented, as well as a detailed step-by-step numeric example on how to obtain its gains based on the desired system response. Simulation results on a multilevel converter have shown the performances of the controller on both steady-state and dynamic behaviour under a reference step change and load step change. It is shown that the controller accurately compensates the phase-delay introduced by the inverter's output filter.