Abstract-Grid connected power converters play a key role in several applications such as integration of renewable energy sources and motor drives. For this reason, the development of high performance control strategies for this particular class of power converters has increasingly attracted the interest of both academic and industry researchers. This paper presents the predictive Optimal Switching Sequence Direct Power Control (OSS-DPC) algorithm for grid connected converters. The OSS-DPC method belongs to the predictive direct power control (P-DPC) family and provides the desired power references by calculating globally optimal switching sequences. To address computational and implementation issues, an efficient control algorithm, named reduced OSS-DPC (ROSS-DPC) is introduced. The implementation of the proposed control strategy in a standard DSP is evaluated on a two-level power converter prototype working as a STATCOM. Experimental results show algorithm's potential to provide high performance during both transient and steady states.

We present a finite control set model predictive controller for closed loop control of an active front-end rectifier. Our method operates in discrete-time and does not require additional modulators. The key novelty of the control algorithm presented lies in the way dynamic references are handled. The control strategy is capable of providing suitable references for the source active power and the rectified voltage, without requiring additional control loops. Experimental results show that fast and accurate tracking of dynamic DC-voltage and reactive power references can be achieved, while respecting restrictions on maximum power levels of the rectifier.

In this work, a cost function design, based on Lyapunov stability concepts, for Finite Control Set Model Predictive Control is proposed. This predictive controller design allows one to characterize the performance of the controlled converter while providing sufficient conditions for local stability for a class of power converters. Simulation and experimental results on a buck dc-dc converter and a 2-level dc-ac inverter are conducted to validate the effectiveness of our proposal.

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