Exact Linearization Nonlinear Neutral-Point Voltage Control for Single-Phase Three-Level NPC Converters

摘要

This letter proposes a new control scheme for the\udneutral-point (NP) balance in single-phase three-level NP-clamped\udconverters. The control is addressed considering the plant under\udstudy, a nonlinear time-variant system. A quasi-exact linearization\udis applied allowing the application of classic control techniques.\udThe described method is simple, general, and suitable for buck\udand boost topologies, as well as for inverter or rectifier operating\udmodes under either linear or nonlinear loading. Correct operation\udis verified under simulated and experimental operation.