Flexible compensator for systems with non-ideal supply voltage

A control technique for shunt voltage source converter based compensators is presented that utilizes a computationally efficient moving-window DFT along with an orthogonal decomposition of the current instead of the filters typically used to extract the desired components of the current. Each orthogonal component of the current can be adjusted independently in any percentage, thus providing selective current compensation. When compensators are employed in systems with higher frequency variability and potentially non-ideal supply voltage such as micro-grids, the compensation performance is degraded. The method presented here provides near immunity to high frequency variability as well as non-ideal supply voltage including both distortion and voltage asymmetry.