风电场并网振荡的频域网络分析及抑制

Frequency-domain Network Analysis and Suppression for Oscillations in Grid-connected Wind Farm

针对当前风电场振荡原因难以确定的问题,提出一种能够定位振荡失稳要素的频域网络分析方法。首先,计及风电场拓扑信息,建立节点频域网络模型;然后,基于该模型的零极点分布,给出判稳依据并提取主导模式;利用模态分解以及导数链式法则,建立节点参与因子和参数灵敏度指标,确定主导节点与关键参数;最后,评估关键参数对于失稳模式的牵引作用,通过逆向调节实现振荡抑制。在Matlab/Simulink平台中搭建一个典型风电场测试案例,验证了所提分析及抑制方法的有效性。

At present,it is difficult to determine the cause of oscillations in a wind farm.To address this issue,a frequency-domain network analysis method is proposed in this paper,which can accurately locate the critical elements of oscillation instability.First,by considering the complete topology of the wind farm,a node frequency-domain network model is established.Second,based on the pole-zero distribution of this model,the system stability criterion is given and the dominant oscillation mode is extracted.Third,the mode decomposition and derivative chain rule are adopted to formulate the node participation factor and parameter sensitivity index,based on which the dominant nodes and critical parameters can be determined.Finally,the traction effect of critical parameters on the instability mode is estimated,where the reverse regulation is applied to realize oscillation suppression.A typical wind farm is built on the Matlab/Simulink platform,and simulation results validate the effectiveness of the proposed theoretical analysis and the oscillation suppression method.