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Design of Decoupled Current Controller for Back to Back Modular Multilevel Converter Based HVDC Transmission System

The modular multilevel converter (MMC) is becoming utmost successful in-recent multilevel configurations, particularly for medium and high voltage applications. A typical application of MMC's is used to control active and reactive power. The design of a decoupled current controller presented in this paper, which allows for the effective regulation of active and reactive power. The controller parameters are fine-tuned depending on the intended output for the input disturbance. The performance of the MMC-based High voltage direct current (MMC-HVDC) transmission system joining two ac networks has been analyzed from transient simulation analysis with proposed controller parameters using MATLAB/SIMULINK.