The invention discloses an improved control strategy for reducing the shafting vibration of a doubly fed wind turbine. The invention of doubly fed wind power generator mathematical model including mechanical transmission system based on, first calculate the theoretical expression of the electromagnetic torque of the power grid voltage swell, and combined with the mathematical model of two mass shafting torsional vibration mechanism, which has carried on the analysis to the high voltage fault; then, put forward a kind of compensation in the electromagnetic torque and torque the differential is proportional to the amount of compensation for the torque control strategy, increase the damping of the two mass model. By calculating the eigenvalues of small signal models of speed loop, the stability and free attenuation characteristics of the system after increasing the compensation torque are analyzed, and the torque observer is introduced to extract the compensated torque that needs to be superimposed.
【技术实现步骤摘要】
一种双馈风力发电机轴系震荡抑制的改进控制策略所属
本专利技术涉及一种双馈风力发电机控制策略,尤其涉及一种双馈风力发电机轴系震荡抑制的改进控制策略。
技术介绍
基于双馈感应发电机(doublyfedinductiongenerator,DFIG)的风力发电机组是目前应用较为普遍的机型,同时也是对电网故障较为敏感的风电机组。其定子直接与外部电网相连,转子通过变流器与电网相连,变流器容量约为机组容量的20%~30%。当外部电网发生电压骤升故障时,机端电压造成转子冲击电流、直流母线过电压和转矩振荡等一系列暂态过程。目前风力发电机组高电压穿越标准主要关注于电网电压骤升时对双馈风力发电机组电磁暂态过程的影响,不同于电压跌落故障,高电压故障发生时,定子磁链和电磁转矩中稳态分量骤升,发电机转子的瞬间“刹车”,电压骤升恢复后电磁转矩又反向变化,使得电磁转矩和传动轴扭矩不匹配,造成柔性传动链的扭曲振荡。风电机组的机械传动链由叶片、轮毂、低速轴、齿轮箱、高速轴、刹车、联轴器、发电机组成。随着单机容量的不断增加,传动链主要零部件的固有频率不断降低,柔性不断增加,导致电磁转矩波动时传动链更 ...
【技术保护点】
一种双馈风力发电机轴系震荡抑制的改进控制策略,其特征在于:包括轴系振荡相关建模、基于附加阻尼补偿的控制策略和电磁转矩补偿量提取三个部分。
【技术特征摘要】
1.一种双馈风力发电机轴系震荡抑制的改进控制策略,其特征在于:包括轴系振荡相关建模、基于附加阻尼补偿的控制策略和电磁转矩补偿量提取三个部分。2.如权利要求1所述的双馈风力发电机轴系震荡抑制的改进控制策略,其特征在于所述轴系振荡相关建模是在电网电压骤升情况下的建模,建立了风力机传动链两质量块...
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