Accelerated model of Modular Multilevel Converters in PSCAD/EMTDC

Modular Multilevel Converters (MMC) is an effective option for continuously growing demands of Voltage Sourced Converter based High Voltage Direct Current (VSC-HVDC) transmission. However, accurate modeling of MMC with high level in PSCAD/EMTDC is extremely time-consuming and hardware-requiring. Based on the Kirchhoff's Law, an equivalent accelerated model for MMC is proposed. The essence of the new model is partition of one large-scale admittance matrix into substantial small-scale matrices, which is mathematically demonstrated with Nodal Analysis Method. Finally, the detailed electromagnetic transient simulations are implemented for comparisons of steady state and transient performances, and the results validate the proposed model.