摘要
因系统故障导致电网高电压时,在传统的双馈风机高电压穿越(简称高穿)控制策略下系统可能存在稳定问题。为此,首先考虑了高穿期间双馈风机电流可行域,基于并网系统机端电压与电流关系(Ut-Id)研究了因平衡点不存在导致的系统高穿期间暂态电压失稳问题,分析高电压水平、电网强度和无功电流增益系数等关键因素的影响。然后,建立双馈风机高穿控制下的系统小信号模型,分析上述关键因素对系统小干扰稳定的影响,结合暂态电压稳定分析结论对无功电流增益系数和分配系数进行选取。最后,基于MATLAB/Simulink仿真验证理论分析的合理性。
High voltage ride-through(HVRT)control strategy may cause stability problems of a doubly-fed induction generator(DFIG)integrated system when over-voltage occurs due to system faults.To tackle this problem,firstly the current feasible region of DFIG during HVRT process was analyzed.Based on the Ut-Id characteristics of DFIG integrated system,the transient voltage instability mechanism caused by the absence of the equilibrium point was revealed.The influence of key factors such as over-voltage level,grid strength,and reactive current gain coefficient was analyzed.Then,the system small signal model during HVRT was derived,and the effects of reactive current control dynamics on small disturbance stability were studied.Based on the stability analysis,two key parameters of the reactive current gain and the distribution coefficients were designed.Finally,the simulation of the typical system of DFIG integrating to infinite grid through the line based on MATLAB/Simulink verifies the rationality of the theoretical analysis.
作者
周昌平
汪震
甘德强
袁辉
辛焕海
ZHOU Changping;WANG Zhen;GAN Deqiang;YUAN Hui;XIN Huanhai(College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第20期7415-7425,共11页
Proceedings of the CSEE
基金
国家自然科学基金项目(52077196,U2166601)。
关键词
双馈风机
高电压穿越
暂态电压稳定
小信号建模
doubly fed induction generator
high voltage ride-through
transient voltage stability
small signal modeling
