基于阻耗系数的双馈风机系统阻尼控制研究  

Damping Control for Grid Connected DFIG System Based on Dissipated Energy Coefficient

作　　者：章艳[1] 张萌 高晗 ZHANG Yan;ZHANG Meng;GAO Han(School of Electrical Engineering,Dalian University of Technology,Dalian 116024,Liaoning Province,China;State Grid Henan Electric Power Company Jiaozuo Power Supply Company,Jiaozuo 454000,Henan Province,China)

机构地区：[1]大连理工大学电气工程学院,辽宁省大连市116024 [2]国网河南省电力公司焦作供电公司,河南省焦作市454000

出　　处：《电网技术》2021年第7期2781-2790,共10页Power System Technology

摘　　要：针对风电并网所带来的系统低频振荡问题,文章基于能量法分析了双馈风机并网时系统的阻尼特性,从物理层面探讨了表征振荡能量耗散的阻耗系数与系统阻尼之间的关系。在双馈风机并网系统中,结合根轨迹法验证了阻耗系数定量分析系统阻尼的有效性,并定量分析了四机两区系统中不同振荡模态下的机组间阻尼。从补偿系统阻尼的角度,结合阻耗系数分析提出了一种模糊控制策略,根据阻耗系数选择了最优模糊控制参数,以最大化增强区间振荡下的系统阻尼。并在恒定风速和随机风速下的多机系统中验证了对区间振荡的抑制效果。In view of the low frequency oscillation caused by wind power grid integration,a damping analysis method for doubly-fed induction generator(DFIG)system by dissipated energy coefficient(DEC)is proposed.Based on the energy method,DEC shows the relationship between the dissipation of oscillating energy and the damping of system.Comparing the root locus analysis,the effectiveness of DEC is verified in grid connected DFIG system.In a typical two areas&four machines system,damping among generators under different oscillating modes are studied by DEC.From the perspective of damping compensation,a fuzzy control strategy is proposed based on DEC.The optimal fuzzy control parameters are determined by DEC,which can maximize the system damping under inter-area oscillation.Finally,time-domain dynamic simulations verify that the additional damping control has a good effect on suppressing inter-area oscillation on a grid connected DFIG four-machine system under constant and random wind speed.

关 键 词：低频振荡 能量法 双馈风机 阻耗系数 模糊控制 

分 类 号：TM721[电气工程—电力系统及自动化]