Abstract
The model predictive control (MPC) is one of the promising approaches to control the multilevel converters. The main features of MPC are fast dynamic response and easy to achieve multiple control objectives with a single cost function. This paper presents a new five-level nested neutral point clamped (5L-NNPC) converter for medium-voltage, high-power applications. For reliable operation, the flying capacitor voltages of 5L-NNPC topology needs to be regulated at one-fourth of the dc-link voltage along with the output current control. To achieve these objectives, an MPC approach is proposed in this paper. To implement the MPC scheme, a discrete-time model of 5L-NNPC topology is developed. The control objectives of 5L-NNPC are included in a cost function and evaluated for all possible switching states. The switching state which minimizes the cost function is selected and applied to the converter. The steady-state and transient performance of 5L-NNPC with MPC scheme are validated through MATLAB simulations.
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