Analysis and Control of Single Phase Grid Connected Modular Multilevel Converter in Per Unit

Year 2020, , 179 - 184, 20.12.2020

Elif Beyhan , Eyüp Akpınar

https://doi.org/10.26701/ems.622397

Abstract

In this paper, a mathematical model and control methods of a modular multilevel converter are examined in per unit. Some control algorithms, like a sorting algorithm, circulating current control, proportional resonant controller and pulse width modulation techniques which are applicable on this converter are investigated. The average value model is used in per unit for the converter and it is combined with circulating current control method and propotional resonant current controller to suppress the second harmonic component in the circulating current. The effect of the circulating current harmonics on the resonance frequency is investigated. A Matlab/Simulink model is prepared for the simulation of converter modeled on the approach of the average value model and the results are generated from the simulation and they are discussed.

Keywords

Modular multilevel converter, average value model, circulating current control, resonance frequency, per unit

References

• Asimakopoulos P. (2013). Design And Control Of Modular Multilevel Converter In An Active Front End Application. CERN Thesis – 2013 – 274, pp. 2-3
• Lescinar A. And Marquardt R. (2003). An Innovative Modular Multilevel Converter Topology Suitable For A Wide Power Range. IEEE Bologna Power Tech Conference Proceedings, June 23 – 26, Bologna, Italy; 3: 6
• Lescinar A., Marquardt R. (2003). A New Modular Voltage Source Inverter Topology”, In Proceedings of the European Power Electronics Conference (EPE), Sep 2 – 4, Toules, France; pp. 1- 10
• Marquardt R. And Lescinar A. (2004). New Consept For High Voltage – Modular Multilevel Converter. IEEE PESC, June 20 – 25, Achen, Germany.
• Glinka, M., & Marquardt, R. (2004). A new single phase AC/AC-multilevel converter for traction vehicles operating on AC line voltage. EPE Journal, 14(4), 7-12.
• Hagiwara, M., Maeda, R., & Akagi, H. (2010). Control and analysis of the modular multilevel cascade converter based on double-star chopper-cells (MMCC-DSCC). IEEE Transactions on Power Electronics, 26(6), 1649-1658.
• Li, J., Konstantinou, G., Wickramasinghe, H. R., Pou, J., Wu, X., Jin, X. (2017). Impact of circulating current control in capacitor voltage ripples of modular multilevel converters under grid imbalances. IEEE Transactions on Power Delivery, 33(3): 1257-1267.
• Antonopoulos, A., Angquist, L., Nee, H. P. (2009, September). On dynamics and voltage control of the modular multilevel converter. In 2009 13th European Conference on Power Electronics and Applications (pp. 1-10). IEEE.
• Casadei, G., Zarri, L., Teodorescu, R. (2012). Modular multi-level converter: modeling, simulation and control in steady state and dynamic conditions. Department of Energy Technology, Aalborg University, Denmark, 21-35.
• Ilves, K., Antonopoulos, A., Norrga, S., Nee, H. P. (2011). Steady-state analysis of interaction between harmonic components of arm and line quantities of modular multilevel converters. IEEE transactions on power electronics, 27(1): 57-68.
• Wang, J., Liang, J., Wang, C., Dong, X. (2017). Circulating current suppression for MMC-HVDC under unbalanced grid conditions. IEEE Transactions on Industry Applications, 53(4): 3250-3259.
• Çerçi E. B. (2019). Analysis and Control of Single Phase Grid Connected Modular Multilevel Converter, M.Sc Thesis, Dokuz Eylul University