弱电网下风电有功出力对次同步振荡特性影响分析及参数调整

Influence of Active Power Output of Full-converter Wind Farm on Subsynchronous Oscillation Characteristics and Parameter Adjustment in Weak Grid

针对弱电网下直驱风电场有功出力对次同步振荡特性(subsynchronous oscillation,SSO)的影响问题,建立了并网系统动态数学模型,利用特征值分析法和参与因子计算,得到主导振荡模式以及主要参与的控制环节。通过分析在不同控制参数和系统结构参数下有功出力与SSO特性的关系,解释学术界和工程中关于有功出力对SSO阻尼影响存在不同观点的原因,确定影响有功出力与SSO阻尼之间关系的主导因素。同时,根据有功出力与SSO阻尼相关特性制定具有抑制SSO作用的参数调整方案,以求对实际工程起到重要的指导作用。时域仿真验证了相关特性和参数调整方案的正确性与有效性。

To analyze the influence of the active power output of direct-drive wind farms in weak grids on the subsynchronous oscillation(SSO),a dynamic mathematical model of the grid-connected system is established.Using the eigenvalue analysis and the participant factor calculation,the dominant oscillation mode and the main participating control link are obtained.By analyzing the relationship between the active power output and the SSO characteristics under different control parameters and system parameters,the reasons for different reviews on the influence of the active power output on the SSO damping in academia and engineering are illustrated,and the dominant factors influencing the relation between the active power output and the SSO damping is determined.Meanwhile,according to the relevant characteristics of the active power output and the SSO damping,a parameter adjustment scheme to suppress the SSO is developed to play an important guiding role in actual engineering.The time-domain results verify the correctness and validity of the relevant characteristics and parameter adjustment scheme.