与常规直流相比，永富直流逆变站存在功率全送和功率分送运行方式，而其处于分网接入方式时电网换相换流器高压直流输电(line commutated converter based high voltage direct current，LCC-HVDC)系统的交互振荡模式及特征尚不明确。针对这一特殊运行方式，采用模块化建模的思路建立可以反映系统电气/控制回路间交互耦合路径的运动方程模型。在此基础上，依据系统整流侧-逆变侧、正极-负极间的交互耦合路径分解得到影响系统主导模式稳定性的 3 条扰动传递路径，即整流侧内部自稳性路径、逆变侧内部自稳性路径、双极交互作用致稳性路径。最后，设置不同工况下的案例，量化评估不同作用路径提供的阻尼大小，并通过仿真验证运动方程模型及扰动传递路径分析结果的正确性，为后续研究分网接入方式下LCC-HVDC系统交互振荡模式的阻尼特征提供模型基础。
Motion Equation Model and Damping Characteristic of Interactive Oscillation Modes for LCC-HVDC System in Split-connection Mode(Part I):Disturbance Transfer Path Decomposition
Compared to the conventional line commutated converter based high voltage direct current(LCC-HVDC)system,Yongfu HVDC project can operate at full power transmission mode and power distribution transmission mode for the inverter station.However,the interactive oscillation modes of LCC-HVDC system in the split-connection mode and their characteristics are unclear.Aiming at this special operation mode,this paper adopted the modular modeling method to establish the system motion equation model which the interactive coupling paths among different electrical and control loops.On this basis,according to the interactive coupling paths between the rectifier and inverter sides or between the positive and negative poles,three disturbance transfer paths which influence the stability of the system dominant mode were separated,i.e.,the self-stabilizing path of the rectifier side,the self-stabilizing path of the inverter side and the en-stabilizing path of bipolar interaction.Finally,the cases under different working conditions were set to quantitatively evaluate the damping provided by different transfer paths.Also,the motion equation model and the analysis results based on the disturbance transfer paths were verified by simulation,which provided the model basis for the subsequent investigation on the damping characteristics of the interactive oscillation modes of the LCC-HVDC system in the split-connection mode.
line commutated converter based high voltage direct current(LCC-HVDC)split-connectionmotion equation modelmodular modelingdisturbance transfer path
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