To facilitate rapid analysis of the oscillation stability mechanism in modular multilevel converter-based high voltage direct current(MMC-HVDC)systems and streamline the simulation process for determining MMC impedanc...To facilitate rapid analysis of the oscillation stability mechanism in modular multilevel converter-based high voltage direct current(MMC-HVDC)systems and streamline the simulation process for determining MMC impedance characteristics,a simplified mathematical simulation model for MMC closed-loop impedance is developed using the harmonic state space method.This model considers various control strategies and includes both AC-side and DC-side impedance models.By applying a Nyquist criterion-based impedance analysis method,the stability mechanisms on the AC and DC sides of the MMC are examined.In addition,a data-driven oscillation stability analysis method is also proposed,leveraging a global sensitivity algorithm based on fast model results to identify key parameters influencing MMC oscillation stability.Based on sensitivity analysis results,a parameter adjustment strategy for oscillation suppression is proposed.The simulation results from the MATLAB/Simulinkbased MMC model validate the effectiveness of the proposed method.展开更多
潟湖体系的潮汐动力对其地貌演变、生态环境保护与海岸带资源的可持续开发利用等具有重要影响。以广东惠州双月湾潟湖为研究靶区,基于2020—2023年4次潮位观测资料,采用基于光滑导纳原理的短时调和分析(modified harmonic analysis mode...潟湖体系的潮汐动力对其地貌演变、生态环境保护与海岸带资源的可持续开发利用等具有重要影响。以广东惠州双月湾潟湖为研究靶区,基于2020—2023年4次潮位观测资料,采用基于光滑导纳原理的短时调和分析(modified harmonic analysis model on the basis of the credo of smoothness,MHACS)模型和数理统计方法初步探讨该潟湖体系潮波传播和变化过程。结果表明,双月湾潟湖体系平均潮差为0.52~0.69m,潮波从口门传播至潟湖上段,其能量明显减小,特别是上游区域的潮波衰减率为近口门段20倍,潮波传播速度亦降低至近口门段的12%。在潟湖中,半日潮M2、全日潮K1和浅水潮M4占据主导,其振幅分别为23.06cm、30.4cm和7.74cm。其中,全日潮和半日潮的振幅月变化较为稳定,而浅水分潮的季节波动更加明显,尤其是向上游传播时,分潮的振幅和迟角季节性变化更为显著。潮波通过口门传入双月湾潟湖,受地形辐聚与底床摩擦效应影响,不同河段的潮波传播速度差异显著,尤其是半日潮在口门区的传播速度普遍高于全日潮。各分潮在潟湖内的振幅衰减明显,特别是S2、M4和MS4分潮的振幅梯度最为显著(4×10^(−6)m^(−1))。展开更多
基金National Natural Science Foundation of China(52307127)State Key Laboratory of Power System Operation and Control(SKLD23KZ07)。
文摘To facilitate rapid analysis of the oscillation stability mechanism in modular multilevel converter-based high voltage direct current(MMC-HVDC)systems and streamline the simulation process for determining MMC impedance characteristics,a simplified mathematical simulation model for MMC closed-loop impedance is developed using the harmonic state space method.This model considers various control strategies and includes both AC-side and DC-side impedance models.By applying a Nyquist criterion-based impedance analysis method,the stability mechanisms on the AC and DC sides of the MMC are examined.In addition,a data-driven oscillation stability analysis method is also proposed,leveraging a global sensitivity algorithm based on fast model results to identify key parameters influencing MMC oscillation stability.Based on sensitivity analysis results,a parameter adjustment strategy for oscillation suppression is proposed.The simulation results from the MATLAB/Simulinkbased MMC model validate the effectiveness of the proposed method.
文摘潟湖体系的潮汐动力对其地貌演变、生态环境保护与海岸带资源的可持续开发利用等具有重要影响。以广东惠州双月湾潟湖为研究靶区,基于2020—2023年4次潮位观测资料,采用基于光滑导纳原理的短时调和分析(modified harmonic analysis model on the basis of the credo of smoothness,MHACS)模型和数理统计方法初步探讨该潟湖体系潮波传播和变化过程。结果表明,双月湾潟湖体系平均潮差为0.52~0.69m,潮波从口门传播至潟湖上段,其能量明显减小,特别是上游区域的潮波衰减率为近口门段20倍,潮波传播速度亦降低至近口门段的12%。在潟湖中,半日潮M2、全日潮K1和浅水潮M4占据主导,其振幅分别为23.06cm、30.4cm和7.74cm。其中,全日潮和半日潮的振幅月变化较为稳定,而浅水分潮的季节波动更加明显,尤其是向上游传播时,分潮的振幅和迟角季节性变化更为显著。潮波通过口门传入双月湾潟湖,受地形辐聚与底床摩擦效应影响,不同河段的潮波传播速度差异显著,尤其是半日潮在口门区的传播速度普遍高于全日潮。各分潮在潟湖内的振幅衰减明显,特别是S2、M4和MS4分潮的振幅梯度最为显著(4×10^(−6)m^(−1))。
