并网DFIG多通道附加阻尼控制器设计及其控制参数整定

Design and parameter setting for multi-band supplementary damping controller of system integrated DFIG

针对双馈感应发电机(DFIG)并网电力系统中多低频振荡(LFO)抑制的问题,提出一种基于DFIG的多通道附加阻尼控制器(MBSDC)设计及其参数整定方法,用于增加系统多LFO模式的阻尼。建立DFIG并网系统状态矩阵,由特征值分析筛选出待抑制的LFO模式,并设计了MBSDC控制策略。在DFIG-MBSDC系统线性化模型基础上,推导目标LFO模式对相应抑制通道传递函数灵敏度的解析表达,以量化多LFO模式与MBSDC传递函数间的联系,应用于控制参数整定。特征值分析与时域仿真结果表明,所提DFIG-MBSDC能抑制DFIG系统中多LFO模式。基于传递函数灵敏度对控制参数进行整定,提高多LFO的抑制效果。

Aiming at the suppression problem of multiple low-frequency oscillation(LFO)modes in doubly-fed induction generator(DFIG)integrated system,the design and parameter setting for multi-band supplementary damping controller(MBSDC)based on DFIG are proposed to improve the damping of multiple LFO modes.The state matrix of the DFIG integrated system is established.The target LFO modes to be suppressed are selected based on the eigenvalue analysis,and the MBSDC strategy is designed.Based on the linearized model of the DFIG-MBSDC system,the analytical expression of the transfer function sensitivity to corre⁃sponding suppression bands is derived,which quantifies the relationship between the multi-LFO modes and the transfer function of the MBSDC,applied for control parameter setting.The eigen-sensitivity analysis and time-domain simulative results show that the proposed DFIG-MBSDC can effectively suppress multi-LFO modes in the DFIG system.The control parameters are adjusted based on the transfer function sensitivity to improve the suppression effect for multi-LFO modes.