A Universal Controller for Grid-Connected Voltage-Source Converters

The power-synchronization control (PSC) and vector current (VCC), the latter including cascaded outer loops, are, respectively, considered to be grid-forming grid-following schemes. They have significant structural differences. Despite that, it is here shown that two schemes can unified by making a series of minor modifications PSC. This results in universal controller, allowing various combinations explored. Fundamentally, allows PSC used as guideline for robust VCC design, permitting stable well-performing operation irrespective grid strength.