风电柔直并网中次同步振荡抑制策略  

Sub-synchronous Oscillation Suppression Strategy in Wind Power Flexible and Direct Grid Connection

作　　者：董佳洲 赵巧娥[1] Dong Jiazhou;Zhao Qiao’e(School of Electric Power,Civil Engineering and Architecture,Shanxi University,Taiyuan Shanxi 030000,China)

机构地区：[1]山西大学电力与建筑学院,山西太原030000

出　　处：《电气自动化》2024年第1期66-69,共4页Electrical Automation

摘　　要：基于模块化多电平换流器(modular multilevel converter,MMC)的柔性直流输电技术已成为大规模远距离风电并网的重要解决方案。但由于MMC自身含有大量电力电子装置,存在引发次同步振荡的风险。针对次同步振荡问题,提出一种计及风机转子侧和环流抑制器的附加阻尼控制策略,在建立风电并网模型的基础上,采用阻抗法对次同步振荡的产生机理进行进一步分析研究。通过MATLAB/Simulink进行仿真试验。结果表明,控制策略能更快地抑制振荡,更好地提高电能质量,同时验证了方法的可行性和正确性。Flexible DC transmission technology based on modular multilevel converter(MMC)has become an important solution for large-scale long-distance wind power grid connection.However,because MMC itself contains a large number of power electronic devices,there is a risk of causing sub-synchronous oscillation.For the problem of sub-synchronous oscillation,an additional damping control strategy taking into account the rotor side of the wind turbine and the circulation suppressor was proposed.Based on the establishment of the wind power grid connection model,the generation mechanism of sub-synchronous oscillation was further analyzed and studied using the impedance method.The simulation test was carried out by MATLAB/Simulink.The results show that the control strategy can suppress the oscillation faster and improve the power quality better,and verify the feasibility and correctness of the method.

关 键 词：风电并网 柔性直流输电 次同步振荡 附加阻尼控制 阻抗分析法 

分 类 号：TM712[电气工程—电力系统及自动化]