摘要
为研究双馈风力发电机的低电压穿越特性,建立了磁链状态方程并求解其特征根。对几种典型的改进励磁电流控制方法进行分析,得出此类方法均是通过控制转子电流指令值来加快磁链的暂态衰减,从而提出在电流环参考值的基础上添加定子磁链暂态分量的补偿项,来改善系统欠阻尼特性,针对PI控制器对交流量调节能力有限,引入电流前馈补偿项,对其进行修正。仿真表明,改进的阻尼控制方法加速了暂态磁链的衰减,提高了故障穿越能力。
In order to research the low voltage ride through characteristics of doubly-fed induction generators, the equation of state is established and the characteristic roots is solved. By analyzing several typical improved excitation current control strategies, it is concluded that these methods used to control the rotor current reference value to accelerate the transient decay of flux. Conse- quently, the compensation term of the stator flux transient component is added on the basis of the reference value of the current loop, in order to optimize the system under-damping characteristics. Because the PI controller has limited capacity to adjust the AC reference,the feed forward current compensation term is introduced to correct it.Simulation results show that the improved damping control method can accelerate the decay of transient flux linkage and improve the low voltage ride through capability.
作者
陆仕信
刘国荣
LU Shi-xin;LIU Guo-rong(College of Infirmation Engineering,Xiangtan University,Xiangtan,Hunan 411105,China;Hunan Institute of Engineering,Xiangtan,Hunan 411104,China)
出处
《计算技术与自动化》
2018年第3期50-55,72,共7页
Computing Technology and Automation
关键词
双馈感应电机
欠阻尼特性
前馈补偿
低电压穿越
doubly fed induction generator
under-damping characteristics
feed forward compensation
low voltage ride through
