直流汇集型风电系统阻抗建模与小干扰稳定性分析  

Impedance Modeling and Small Disturbance Stability Analysis of DC Pooling Wind Power System

作　　者：李小龙 樊艳芳[1] 侯俊杰[1] 卢俊龙 玄东旭 LI Xiaolong;FAN Yanfang;HOU Junjie;LU Junlong;XUAN Dongxu(School of Electrical Engineering,Xinjiang University,Urumqi 830017,China;Institute of Electrical Engineering,Chinese Academy of Science,Beijing 100190,China)

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830017 [2]中国科学院电工研究所,北京100190

出　　处：《高电压技术》2025年第4期1632-1644,I0011-I0015,共18页High Voltage Engineering

基　　金：国家重点研发计划(2021YFB1507000);“天山英才”培养计划(2022TSYCLJ0019)。

摘　　要：与交流汇集型风电系统相比,直流汇集方式通过高变比大容量直流变换器对直流输出型风电机组进行升压汇集,可减小系统损耗并促进远距离直流输电。该系统中电力电子装备数量较多,亟需开展阻抗建模及振荡特性分析。为此,首先提出输入并联输出串联型Boost全桥隔离变换器二端口阻抗模型,在此基础上建立串并联汇集拓扑的风电场送出端口阻抗模型,并采用多谐波线性化法建立模块化多电平换流器(modular multilevel converter,MMC)直流侧输入阻抗模型。根据小信号模型的频率特性对直流汇集型风电系统进行小干扰稳定性分析。最后,在MATLAB/Simulink中搭建系统时域仿真模型,验证了所建立阻抗模型及系统稳定性分析结论的正确性。Compared to existing AC-pooled wind power systems,the DC pooling method uses a high-variable-ratio and large-capacity DC converter to boost and aggregate DC-output wind turbine generators,which reduces system losses and facilitates long-distance DC transmission.The high number of power electronic equipment in the system requires impedance modeling and oscillation characterization urgently.To this end,a two-port impedance model of the input-parallel output-series Boost full-bridge isolation converter is first proposed.Based on this,an impedance model of the send-out port for the series-parallel pooling topology wind farm is established,and a multi-harmonic linearization method is used to establish the DC-side input impedance model of the modular multilevel converter(MMC).The stability analysis of the DC pooled wind power system is carried out according to the frequency characteristics of the small-signal model.Finally,the time-domain simulation model of the system is built in MATLAB/Simulink to verify the correctness of the established impedance model and the conclusions of the system stability analysis.

关 键 词：直流汇集 风电 Boost全桥隔离变换器 模块化多电平变换器 阻抗建模 小干扰稳定性 

分 类 号：TM614[电气工程—电力系统及自动化]