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Research on comparative analysis of MMC control strategies
Author(s): 
Pages: 55-63
Year: Issue:  8
Journal: Electric Machines and Control

Keyword:  modular multilevel convertermodel preditive controltraditonal PI controllerdead-time compensationcirculating current suppressingcapacitor-voltage balancing control;
Abstract: Aiming at study the MMC control strategies, model predictive control was applied to MMC sys-tem.In order to achieve the better control results, dead-time compensation was introduced in model pre-dictive control, and it made an in-depth analysis compared with the traditional PI controller.Finally, the prototype test results indicate that both control strategies can obtain good results on controlling MMC out-put voltages, currents, sub-model capacitor voltages and suppressing circulating currents.Although the output currents by model preditive control are not as good as that by traditional PI controller, the model preditive control has a great advantage on capacitor-voltages balancing.Besides, the dynamic perform-ance of model preditive control is even superior to the considered PI control, due to the prediction of the future converter behavior.
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