This paper describes a photovoltaic-grid connected Nine Level Packed U Cell (PUC9) topology using a Finite Control Set – Model Predictive Control (FCS-MPC) technique. The proposed system is a singlephase multilevel inverter, with four pairs of switches that work in a complementary matter, one DC source and two flying capacitors connected to the grid through a filtering inductor. This topology has the ability to generate nine different voltage levels with less number of active and passive components comparing with conventional multilevel inverter topologies. The proposed control technique (FCS-MPC) aims at reducing the total harmonic distortion (THD) of the grid injected current while balancing the capacitors’ voltages at their nominal reference values. Robustness analysis of the proposed model including the effect of a step change in the injected current into the grid, parameters’ mismatching, and grid voltage sag and swell have been conducted on a single phase low power (PUC9) inverter. Theoretical analysis, mathematical modelling and simulation results using MATLAB/SIMULINK software are presented in this paper. The obtained THD of the injected current for the proposed model is 1.13% and the capacitors’ voltages error is less than 5%.
Multi Level Inverter, Genetic Algorithm, Packed U Cell Inverter, Total harmonic Distort
Cite this paper
Alaa’Abuqubaita, Sameer Khader, Abdel Karim Daud, Hamza Makhamreh. (2019) Finite Control Set – Model Predictive Control of a Nine Level Packed U Cell Grid Connected Multilevel Inverter. International Journal of Control Systems and Robotics, 4, 11-20
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