双馈风电机组经串补并网的振荡模式分析  

Modal Analysis of Doubly-fed Induction Generator Integrated to Compensated Grid

作　　者：赵书强[1] 李忍[1] 高本锋[1] 宋瑞华[2] 杨大业[2] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,保定071003 [2]中国电力科学研究院,北京100192

出　　处：《高电压技术》2016年第10期3263-3273,共11页High Voltage Engineering

基　　金：国家自然科学基金(51507064);中央高校基本科研业务费专项资金(2015MS84)~~

摘　　要：大规模风电经串补并网系统存在稳定性问题,为全面分析双馈风电机组(DFIG)经串补并网系统的振荡模式,建立了双馈风电机组经串补并网详细的状态空间模型。采用小信号分析法计算系统26阶状态矩阵特征值、阻尼比,基于模态频率和参与因子分析,甄别出待研系统的主要振荡模式。结果表明,该系统主要有高频振荡模式、轴系主导的振荡模式、由固定串补与变频器相互作用引起的次同步控制相互作用(SSCI)模式。变频器PI参数对SSCI频率和阻尼具有一定的影响,其中电网侧变频器(GSC)内环PI参数起主导作用;SSCI的频率受串补度的影响较大,且振荡频率在串补模态频率附近。The stability problem may exist in large-scale wind power system integrated to compensated grid.In order to analyze oscillation modes of the DFIG-based wind farm interfaced with compensated system, we established the state space model of regarding system. The small signal analysis method was adopted to compute eigenvalue and damping ratio of 26 ranks state space model related to the aforementioned system, and the modes pertaining to system under studied were screened out through mode frequency and damping ration analysis. The results show that the system contains highfrequency mode caused by inductance and capacitance（LC）, modes dominated by the shaft, the sub-synchronous control interaction（SSCI） caused by series compensation and converter. The characteristics of the frequency and damping ratio were delved into. It is showed that the proportional and integral（PI） parameters have effects on the frequency in some sense, of which the effects the inner loop PI parameters belonging to grid side converter（GSC） are dominant. However, the compensation level is the key factor on the frequency which is in harmony with the mode frequency of series compensation.

关 键 词：双馈风电机组 次同步控制相互作用 状态空间模型 小信号法 模式分析 参与因子 

分 类 号：TM614[电气工程—电力系统及自动化]