计及多频率耦合特性的双馈风电-串补并网系统引发次同步振荡建模与分析  

Modeling and analysis of sub-synchronous oscillation induced by doubly-fed wind farm grid-connected system considering multi-frequency coupling characteristics

作　　者：郑絮 马覃峰 Zheng Xu;Ma Qinfeng(School of Elctrical Engineering,Guizhou University,Guiyang 550025,China;Power Dispatching Control Center of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China)

机构地区：[1]贵州大学电气工程学院,贵州贵阳550025 [2]贵州电网有限责任公司电力调度控制中心,贵州贵阳550002

出　　处：《可再生能源》2022年第6期830-838,共9页Renewable Energy Resources

基　　金：中国南方电网有限责任公司重点科技项目(GZKJXM20210372)。

摘　　要：针对“双高”电力系统与电网间交互作用引起的新型次同步振荡问题,首先分析了双馈风机变流器控制回路与电网之间具有多频率耦合特性的次同步控制相互作用机理,建立双馈风电场经串补并网的等值模型;其次通过风电并网模型,采用基于定子电压定向的矢量控制方式进行双馈风机RSC,GSC控制;然后通过对双馈感应发电机(DFIG)并网次同步振荡机理的分析,建立电力电子变流器与电网之间的次同步控制模型;最后通过PSCAD/EMTDC软件搭建的仿真模型,采用所提出的控制策略,并结合负阻尼效应及次同步控制方法进行分析对比验证,结果表明,文章所提出的方法能够有效地解决双馈风电-串补并网系统引发的次同步振荡问题。Aiming at the problem of new sub-synchronous oscillation(SSO) caused by the interaction between the "double high" power system and the grid,this paper first established a simplified equivalent system of doubly-fed wind farms connected to the grid via series compensation,and derives the control loop of the doubly-fed wind turbine converter. The interaction mechanism of sub-synchronous control with multi-frequency coupling characteristics between power grids. Then,using an actual wind farm as a prototype, build its simulation model with the help of PSCAD/EMTDC software,and obtain the stator and rotor current waveform spectrum analysis results and theoretical analysis results in different coordinate systems through time domain simulation to verify its rationality. The above analysis further analyzes the influence of system operating parameters, control loop parameters, and limiting nonlinearity on the SSO caused by the series-compensated grid connection of doubly-fed wind farms. Finally, combined with the negative damping effect and the sub-synchronous control interaction(SCCI), the characteristics of the new type of SSO caused by the series-compensated grid connection of the doubly-fed wind farm are summarized.

关 键 词：双馈风电场 电力电子 多频率耦合特性 次同步振荡 次同步控制相互作用 稳定性分析 

分 类 号：TK89[动力工程及工程热物理—流体机械及工程] TM743[电气工程—电力系统及自动化]