MID- AND HIGH-FREQUENCY RESONANCE ANALYSIS AND SUPPRESSION OF OFFSHORE WIND POWER GENERATION MMC-HVDC GRID-CONNECTED STSTEM CONSIDERING DISTRIBUTED CHARACTERISTICS OF SUBMARINE CABLE

Li Hui; Li Qinghe; Yao Ran; Tan Hongtao; Zheng Jie; Yang Wei

doi:10.19912/j.0254-0096.tynxb.2021-1508

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (4) : 74-84. DOI: 10.19912/j.0254-0096.tynxb.2021-1508

MID- AND HIGH-FREQUENCY RESONANCE ANALYSIS AND SUPPRESSION OF OFFSHORE WIND POWER GENERATION MMC-HVDC GRID-CONNECTED STSTEM CONSIDERING DISTRIBUTED CHARACTERISTICS OF SUBMARINE CABLE

Li Hui¹, Li Qinghe¹, Yao Ran¹, Tan Hongtao¹, Zheng Jie^1,2, Yang Wei²

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Abstract

The distributed capacitive characteristics of AC submarine cable in offshore wind farm are prone to cause mid-and high-frequency resonance instability in the grid-connected system. Based on impedance stability analysis principle, the mechanism of resonance instability in the grid-connected offshore wind power generation modular multilevel converter （MMC） based HVDC system is studied and the corresponding resonance suppression method is proposed. Firstly, considering the distribution characteristics of submarine cable, the small-signal impedance model of grid-connected system is developed, which is validated by impedance scanning. Secondly, the impedance stability criterion is applied to investigate the influence of the distribution characteristics of submarine cable and the controller parameters on the mid-and high-frequency stability of system. Finally, a method is proposed to suppress the mid-and high-frequency resonance based on the optimization of controller parameters, and the accuracy of the theorectical analysis and the feasibility of the suppression method were verified by simulations. The results indicate that the mid-and high-frequency resonance in the grid-connected system are mainly induced by the interaction between the AC submarine cable and the AC/DC side equipment, and the distribution characteristics of the long-distance submarine cable will lead to multiple resonant peaks and negative damping in the system and deteriorate its stability, especially when the proportional coefficient of MMC fundamental frequency current loop is too large, which can be suppressed by the proposed parameter optimization method

Key words

offshore wind farm / MMC / harmonic resonance / distribution characteristics / impedance analysis / parameter optimization

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Li Hui, Li Qinghe, Yao Ran, Tan Hongtao, Zheng Jie, Yang Wei. MID- AND HIGH-FREQUENCY RESONANCE ANALYSIS AND SUPPRESSION OF OFFSHORE WIND POWER GENERATION MMC-HVDC GRID-CONNECTED STSTEM CONSIDERING DISTRIBUTED CHARACTERISTICS OF SUBMARINE CABLE[J]. Acta Energiae Solaris Sinica. 2023, 44(4): 74-84 https://doi.org/10.19912/j.0254-0096.tynxb.2021-1508

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