Comparative Study of Predictive-Fixed Switching Techniques for a Cascaded H-Bridge Two level STATCOM

Finite state model predictive control methods are distinguished by a variable switching frequency which causes large current ripples at low sampling frequency. This paper presents a comparative study of two enhanced predictive current control techniques with fixed switching frequency applied to the three-wire cascaded H-bridge two level converter for active power filter applications. Simulation results are developed to demonstrate the performance of the two proposed predictive control techniques in terms of mean square error, root mean square and total harmonic distortion as figures of merit, thus concluding the advantages and limitations of each technique at transient and steady states.

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