基于功率外环附加阻尼控制的柔性直流抑制送端火电机组次同步振荡研究  

Research on subsynchronous oscillation suppression strategy of flexible HVDC with thermal power units based on external loop damping control

作　　者：李长宇 刘博昊 肖仕武[3] 卢文清 梁倍华 李善颖 LI Changyu;LIU Bohao;XIAO Shiwu;LU Wenqing;LIANG Beihua;LI Shanying(State Grid Jibei Electric Power Research Institute,Beijing 100045,China;Binhai Power Supply Branch of State Grid Tianjin Electric Power Company,Tianjin 300450,China;School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国网冀北电力有限公司电力科学研究院,北京100045 [2]国网天津市电力公司滨海供电分公司,天津300450 [3]华北电力大学电气与电子工程学院,北京102206

出　　处：《电力科学与技术学报》2024年第2期20-27,73,共9页Journal of Electric Power Science And Technology

基　　金：国家自然科学基金(52130709)。

摘　　要：利用柔性直流控制的灵活性抑制次同步振荡被广泛研究,但是对于有功、无功控制回路的抑制效果不同的机理解释很少。针对柔直近区火电机组的次同步振荡问题,提出一种基于功率外环附加阻尼控制的柔直抑制次同步振荡策略。通过对电气阻尼曲线负阻尼频段分析,结合柔直变流器控制特点,选取附加控制的最优位置,通过基于功率外环附加阻尼控制提高火电机组电气阻尼。然后,建立复转矩系数传递函数,分析有功、无功外环附加阻尼控制效果的强弱与柔直功率外环参数相关,主要是与传输有功、无功功率大小有关,揭示柔直功率外环d轴和q轴附加阻尼控制时对电气阻尼影响差异的机理。最后,通过PSCAD时域模型仿真验证分析的正确性。The flexibility of flexible DC control has been widely studied to suppress subsynchronous oscillation,but there is little explanation of the mechanism for the different suppressive effects of active and reactive control loops.Aiming at the subsynchronous oscillation problem of thermal power units in the vicinity of flexible DC,a suppression strategy for subsynchronous oscillation of flexible DC based on additional damping control of the power outer loop is proposed.By analyzing the negative damping frequency band of the electrical damping curve and combining the control characteristics of the flexible DC converter,the optimal position for additional control is selected,and the electrical damping of the thermal power unit is improved through additional damping control based on the power outer loop.Then,a transfer function of the complex torque coefficient is established,and it is analyzed that the damping effect of the active and reactive outer loop with additional damping control is related to the parameters of the power outer loop,mainly related to the transmitted active and reactive power,revealing the mechanism of the difference in the impact of additional damping control on the electrical damping of the d-axis and q-axis of the power outer loop.Finally,the correctness of the analysis is verified through simulation of PSCAD time-domain model.

关 键 词：柔性直流输电 次同步振荡 电气阻尼 复转矩系数 附加阻尼控制 抑制效果分析 

分 类 号：TM712[电气工程—电力系统及自动化]