Computationally Efficient Predictive Control of Three-Level NPC Converters with DC-Link Voltage Balancing: A Priori State Selection Approach

We propose a novel framework for multistep predictive current control for induction machines. The main contribution of this work is the achievement of the control goal over a long prediction horizon while reaching DC-link balancing for the accompanying three-level neutral point clamped (3L-NPC) inverters at the same time. The multistep prediction horizon is implemented using a sphere decoding algorithm. The DC-link balancing is guaranteed by modifying the sphere decoder such that only neutral point affecting states are selected if the DClink voltage is imbalanced. Since those states are not uniquely defined for the 3L-NPC inverter, the state that minimizes the DC-link voltage is then selected within a preprocessing stage. The framework is verified by means of simulations.     «

We propose a novel framework for multistep predictive current control for induction machines. The main contribution of this work is the achievement of the control goal over a long prediction horizon while reaching DC-link balancing for the accompanying three-level neutral point clamped (3L-NPC) inverters at the same time. The multistep prediction horizon is implemented using a sphere decoding algorithm. The DC-link balancing is guaranteed by modifying the sphere decoder such that only ne...     »