双馈-直驱混合风电场次同步振荡影响因素分析

Research on influencing factors of DFIG-PMSG hybrid wind farm sub-synchronous oscillations

本文以中国河北沽源双馈-直驱混合风电场2016年发生的次同步振荡事件为例,基于现场实测数据分析了次同步振荡特性及影响因素,并在理论上建立了双馈-直驱混合风电场小信号数学模型。通过振荡模态和相关因子分析,探究了混合风电场中影响次同步振荡的因素并对其进行了仿真验证。理论分析和仿真结果表明,风电场中双馈与直驱风机的比例、串联补偿水平以及风力发电机变流控制器参数等是影响次同步振荡的重要因素,且在不同的风机比例下起主要作用的影响因素不同。

In this study,taking the sub-synchronous oscillation event that occurred in Guyuan hybrid wind farm of Hebei Province,China,in 2016 as an example,the characteristics and influencing factors of the sub-synchronous oscillation are analyzed in detail based on the field measured data.This paper builds a small signal mathematical model of DFIG-PMSG hybrid wind farm in theory,and through the modal analysis and correlation factor analysis,the influencing factors of sub-synchronous oscillation in hybrid wind farm are explored and verified in simulation.Theoretical analysis and simulation results show that the proportions of wind farm,series-compensated degree,controller parameters of wind turbine and power grid strength are important factors on sub-synchronous oscillation and the main influencing factors are different under the different proportion of wind farm.