A generalized power control approach in ABC frame for modular Multilevel Converters based on mathematical optimization

• Published in: 2012 IEEE International Energy Conference and Exhibition pp. 158 - 165
• Main Authors: Bergna, G., Berne, E., Egrot, P., Lefranc, P., Vannier, J.-C, Arzande, A., Molinas, M.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.09.2012
• Subjects: Capacitors; Control; Energy storage; Equations; Lagrange Multipliers; Linear programming; Mathematical model; Modular Multilevel Converter; Optimization; Topology
• ISBN: 9781467314534; 1467314536
• DOI: 10.1109/EnergyCon.2012.6347744

In this work, a generalized optimization methodology based on Lagrange Multipliers was used to propose circulating current references in order to properly control the Modular Multilevel Converter (MMC) under different conditions. The optimization strategy finds the local minima of the objective function, which is typically the power losses of the MMC system, subject to equality constraints, which are previously defined by the desired operating condition. Furthermore, this control approach is developed in the ABC frame, giving more insight into the physical phenomena related to the MMC internal dynamics. Finally, equivalent controllers to existing ones, which can be found in the literature, are obtained by means of this methodology with the objective to demonstrate the versatility and generality of the present control approach.