FCS-MPC Control Strategy for a New Fault Tolerant Three-level Inverter

In order to meet the high reliability of aviation inverters, the paper established a new three-level inverter which can increase the reliability in safety-critical applications, what's more, the new topology adding assistant leg to control neutral-point voltage independently. On the basis of the new topology, a mixed logic dynamic (MLD) model was established for the new inverter circuits, and takes finite control set model predictive control (FCS- MPC) for the new inverter. The method takes a discrete-time model of inverter to predict the future value of the all possible voltage vectors generated by the inverter. The vector which minimizes objective function in finite control set is selected as the control of inverter, the objective function used in this work evaluates the voltage error and the switch frequency at the next sampling time. The paper explicitly researched the solving algorithm and realization procedure of the new inverter circuit, its feasibility and validity is verified by the experiment.

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