Abstract
This paper presents a novel control system structure for fast arm voltage control and balancing of parallel connected Modular Multilevel Converters for modern HVDC systems. Naturally, voltage pulsations in the submodule capacitors are superimposed to the dominating DC component. In order to control the DC component, filters are commonly applied, which introduce additional delays in the control loops. Using estimated voltage pulsations, the dynamic behavior of the control system can be increased. For the case of parallel connected MMCs, voltage balancing between the converters is mandatory and can be accomplished by adding additional and independent control loops. The effectiveness of the control system is validated by EMT simulations under various operating points.
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