Multilevel Modular Converter for VSC-HVDC Transmission Applications: Control and Operational Aspects

Control methods for a new class of converter, the multilevel modular converter (MMC), recently introduced for HVDC transmission are discussed. The paper discusses converter-level controls including firing pulse generation and capacitor voltage balancing. It also covers higher level controls for incorporating the converter into a larger power network, with a weak ac receiving end. The performance behavior is studied using electromagnetic transients simulation. Keywords-Voltage Source Convert (VSC), Multilevel Modular Converter (MMC), HVDC Transmission, Weak ac networks

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