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摘要
The AC side admittance modeling of modular multilevel converter (MMC) is the theoretical basis for the study of resonance. In the process of admittance modeling, most of the existing studies regard the converter as a single input and single output system without considering the frequency coupling effect, or consider that the frequency coupling has little effect on the admittance characteristics in the medium and high frequency band, which may affect the accuracy of the stability analysis result based on the admittance model. In this paper, the frequency coupling effect of MMC control loop and bridge arm dynamic process is considered. First, based on the multi-harmonic linearization method, the frequency coupling admittance matrix model in the wide frequency band of MMC from the AC side port is established. Then, the frequency coupling coefficient (FCC) is defined, the influence of MMC parameters on FCC is analyzed, and a frequency coupling suppression strategy based on power loop symmetry control is proposed. Finally, taking Guangxi side model of Luxi back-to-back HVDC project as an example, the correctness of admittance matrix and the effectiveness of frequency coupling suppression strategy are verified by PSCAD/EMTDC simulation. ? 2023 Chinese Society for Electrical Engineering.
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