双馈风机故障穿越期间转速波动特性分析及其抑制方法  

Analysis and Suppression of Rotor Speed Fluctuation of DFIG-based Wind Turbines During Fault Ride Through

作　　者：王志浩[1] 史文轩 丁磊[1] 孙勇 应有 WANG Zhihao;SHI Wenxuan;DING Lei;SUN Yong;YING You(Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University),Ministry of Education,Jinan 250061,Shandong Province,China;Zhejiang Windey Co.,Ltd.,Hangzhou 310012,Zhejiang Province,China)

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市250061 [2]浙江运达风电股份有限公司,浙江省杭州市310012

出　　处：《电网技术》2021年第5期1707-1715,共9页Power System Technology

基　　金：国家重点研发计划项目“大容量风电机组电网友好型控制技术”(2018YFB0904000)。

摘　　要：随着风电渗透率不断增加,为维持电网运行安全稳定,要求风电机组具有故障穿越(fault ride through,FRT)能力。在目前双馈风电机组(doubly fed induction generator,DFIG)故障穿越的控制策略下,电网故障引起的有功功率不平衡,可能会导致转速较大幅度的波动。基于此,首先考虑风功率捕获、桨距角控制、故障穿越控制及转子运动等因素,建立起用于观察双馈风机故障穿越期间转速波动特性的数学模型。然后,对转速波动的特点及其出现的原因进行了理论分析,并据此提出了基于桨距角控制模式切换的控制方式,来改善故障穿越期间双馈风机的转速波动特性。最后,在DIgSILENT PowerFactory仿真平台上建立了双馈风机时域精细仿真模型,并验证了所提控制策略的有效性。With the increasing penetration of wind power,wind turbines are required to have the fault ride through(FRT)capability to maintain the security and stability of the power grid.Under the current control strategy of doubly fed induction generator(DFIG)-based wind turbines,due to the power imbalance caused by a grid fault,the rotor speed may fluctuate severely.In this paper,the wind power model,the pitch angle control model,the FRT control model and the rotor motion model are taken into account to establish a mathematical model to observe the speed fluctuation during the FRT process.Then,the characteristics and causes of speed fluctuation are analyzed theoretically,and a control method based on the pitch angle control mode switching is proposed to improve the speed characteristics of DFIG in the FRT process.Finally,a time-domain simulation model of the DFIG considering the speed fluctuation in the FRT process is established based on the DIgSILENT PowerFactory software,and the effectiveness of the improved method is verified.

关 键 词：双馈风机 故障穿越 转速波动 桨距角控制 

分 类 号：TM614[电气工程—电力系统及自动化]