并网双馈风电场直流电压时间尺度小干扰稳定性分析  

A Stability Analysis of Small Disturbances in Grid-Connected Doubly-Fed Wind Farms with DC Voltage Time Scales

作　　者：吕健勇 陈骁 杜文娟 LÜJianyong;CHEN Xiao;DU Wenjuan(School of Electrical Engineering,Sichuan University,Chengdu 610065,Sichuan,China;North China Branch of State Grid Corporation of China,Beijing 100053,China)

机构地区：[1]四川大学电气工程学院,四川成都610065 [2]国家电网有限公司华北分部,北京100053

出　　处：《电网与清洁能源》2024年第12期111-119,共9页Power System and Clean Energy

基　　金：国家自然科学基金资助项目(52077144)。

摘　　要：并网风电场引发的宽频振荡稳定性问题严重影响新能源电力系统的安全稳定运行。针对并网双馈风电场直流电压时间尺度小干扰稳定性问题,首先,推导了双馈风电场全阶线性化模型,在此基础上构建并网双馈风电场含转子侧换流器功率外环控制和网侧换流器直流电压外环控制的聚合模型。其次,根据劳斯-赫尔维茨定理推导出并网双馈风电场小干扰稳定性判据。基于小干扰稳定性判据,揭示了交流电网强度、风机有功功率、双馈风机控制参数和风电场网络结构是如何共同影响系统的小干扰稳定性。最后,以15台双馈风机构成的并网双馈风电场为例,验证了本文理论推导的正确性和有效性。The broadband oscillation instability caused by grid-connected wind farms seriously affects the safe and stable operation of new energy power systems.In this paper,to address the small disturbance stability problem of grid-connected doubly-fed wind farm DC voltage time scale,firstly,a full-order linearised model of the doubly-fed wind farm is derived,based on which an aggregation model of the grid-connected doubly-fed wind farm with rotor-side converter power outer-loop control and grid-side converter DC voltage outer-loop control is constructed,and then a small disturbance stability criterion of the grid-connected doubly-fed wind farm is derived based on the Rausch-Hurwitz theorem.Based on the small disturbance stability criterion,it is revealed how the AC grid strength,wind turbine active power,doubly-fed turbine control parameters and wind farm network structure jointly affect the small disturbance stability of the system.Finally,a grid-connected doubly-fed wind farm with 15 doubly-fed turbines is used as an example to verify the correctness and effectiveness of the theoretical derivation presented in this paper.

关 键 词：并网双馈风电场 小干扰稳定性 线性化模型 直流电压时间尺度 网络结构 稳定性判据 

分 类 号：TM712[电气工程—电力系统及自动化]