构网型风电-串补输电系统的次同步振荡特性分析  

Analysis of Sub-synchronous Oscillation Characteristics of Grid-type Wind Power-series Supply Transmission System

作　　者：郝锦文 马永光[1] 孙大卫 HAO Jinwen;MA Yongguang;SUN Dawei(Department of Automation,North China Electric Power University,Baoding 071003,China;State Grid Jibei Electric Power Research Institute,Beijing 100045,China)

机构地区：[1]华北电力大学自动化系,河北保定071003 [2]国网冀北电力科学研究院(华北电力科学研究院有限责任公司),北京100045

出　　处：《电力科学与工程》2023年第9期55-62,共8页Electric Power Science and Engineering

基　　金：国家电网公司总部科技项目(5108-202218280A-2-306-XG)。

摘　　要：针对构网型直驱风电–串补系统的次同步振荡特性,在Simulink仿真软件中建立了风电–串补输电系统的等值模型。利用阻抗分析法,具体分析了次同步振荡风险在不同电网强度下与风机并网数量以及关键控制参数的关系。研究表明,串补度增大,次同步振荡风险增加。无串补时,系统在各种工况下稳定性良好;有串补时,构网型直驱风电机组并网系统在电网强度较弱时无谐振风险,在强电网接入条件下的次同步谐振风险增加;随着并网风机数量的增多,系统次同步谐振风险先增大后减小;风速增大会导致次同步谐振风险增加,直流电压和输出转速的比值增大也会导致次同步谐振风险增加。According to the sub-synchronous oscillation characteristics of grid-based direct-driven wind power-series compensation system,the equivalent model of wind power-series compensation system is built in Simulink.By using impedance analysis method,the relationship between the risk of sub-synchronous oscillation under different power grid strength and the number of fans connected to the grid and the key control parameters is analyzed.The results show that the risk of sub-synchronous oscillation increases with the increase of series compensation degree.without series compensation,the stability of the system under various operating conditions is good;with series compensation,the grid-connected direct-drive wind turbine system has no resonance risk when the power grid strength is weak,and the sub-synchronous resonance risk increases when the power grid is connected to the strong power grid;with the increase of the number of wind turbines connected to the grid,the sub-synchronous resonance risk increases first and then decreases;the increase of wind speed will lead to the increase of the sub-synchronous resonance risk,and the increase of the ratio of DC voltage to output speed will also lead to the increase of the sub-synchronous resonance risk.

关 键 词：风力发电机组 构网型 次同步振荡 串补系统 短路比 

分 类 号：TM614[电气工程—电力系统及自动化] TM712