DC Current Elimination for MPC for CHB-STATCOM Employing Current Transformer Sensors

Current transformers are widely used as sensors in high-power converters. However, they are incapable of handling DC components, resulting in potential malfunctions. This paper shows that, in a cascaded H-bridge static synchronous compensator with finite control set model predictive control, they can be easily suppressed by adding a cluster balancing optimization algorithm. Experimental evidence is provided by implementing the proposed cluster balancing optimization algorithm on a three-phase, 5-level STATCOM.