Comparative Study on Impact of Different Models on Large Signal Stability Analysis Accuracy in MMC-HVDC Systems
Modular multilevel converter based high voltage direct current(MMC-HVDC)systems are inevitably subjected to large-signal disturbances during operation,which may lead to instability.The large signal stability of MMC-HVDC system under three different models is compared and analyzed based on the mixed potential theory(MPT).Firstly,the full order model,reduced order model and equivalent constant power load(CPL)model of MMC-HVDC system are established,and the differences among the three models are compared and analyzed from theoretical perspective.Then,the large-signal stability criteria for MMC-HVDC system based on three different models are derived through MPT,and the effects of three different models on the stability analysis results of large-signal are compared and studied.The system stable operating boundary under large disturbances of grid voltage sag is determined.Finally,the correctness of theoretical analysis is verified through Matlab/Simulink time domain simulation.
MMC-HVDClarge signal stabilitycomparison of model accuracymixed potential theory
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