Harmonic Current Compensation by GPS-synchronized Grid Forming Converters

In the last few years the concept of grid forming converters (GFCs) has aroused a significant of interest in the control of grid-tied electronic power system, especially for stability of large interconnected networks and systems in islanded operation. GFCs act as voltage generator behind an impedance and are able to support the grid or to generate the grid voltage when it is absent. The aim of this paper is to develop a control for the stability of GFCs to achieve harmonic current compensation in the grid. Specifically, the compensation of the harmonics is pursued by performing synchronized measurements of the current distortion at the point of common coupling (PCC) and by generating an appropriate voltage reference for the GFCs. The proposed harmonic solution is validated using a hardware in the loop (HIL) experimental set up.