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The Impact of Modular Multilevel Converter Control on DC Short-Circuit Currents of HVDC Systems

In Modular Multilevel Converter (MMC) based DC systems, during the initial stage of a DC fault, the control system operates normally, inserting and bypassing submodules. Conse- quently, each MMC control technique would provide a different characteristic to the DC short-circuit behavior. Therefore, this pa- per presents a comparative analysis of MMC control techniques, providing a better understanding on how the control techniques impact the fault currents. The analyses were performed by simulating and applying DC faults to a two-terminal VSC-HVDC system with different groups of control techniques. It was found that the DC fault current was not influenced either by control parameters, modulation or output-current control techniques. The arm-balancing control influenced the DC fault currents as it has an impact on the modulation reference signal.

Author(s):

Vinícius Lacerda    
University of São Paulo
Brazil

Nayara Suzuki    
University of São Paulo
Brazil

Denis Coury    
University of São Paulo
Brazil

Renato Monaro    
University of São Paulo
Brazil

 

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