【作者】 周渊深； 朱希荣；

【Author】 Yuanshen Zhou Xirong Zhu Department of Electronic Engineering,Huaihai Institute of Technology,Lianyungang 222005,China

【机构】 淮海工学院电子工程学院；

【摘要】 在双馈感应发电机(DFIG)矢量控制中,发电机转子电流M轴和T轴间存在的交叉耦合电压影响着风力发电系统的性能。在分析前馈解耦、反馈解耦等传统解耦方法原理和不足的基础上,讨论了常规一自由度内模解耦的原理,提出了二自由度、三自由度内模解耦方法并进行了解耦研究。理论分析和仿真结果表明:当DFIG参数同步变化时,一自由度内模解耦效果不受DFIG参数变化和电流偏差的影响;当电机参数非同步变化时,转子电流仍存在耦合现象;一自由度内模解耦只有一个可调参数,调节简单,但解耦效果较差。二自由度内模解耦有两个可调参数,但需进行折中选择,难以获得满意的解耦效果。本文提出的三自由度内模解耦控制方法,通过前馈控制器、内模控制器、反馈滤波器,从多个方面进行解耦。仿真实验表明三自由度内模解耦控制能够实现完全解耦。更多还原

【Abstract】 In a vector-controlled doubly-fed induction generator(DFIG),the cross-coupling voltage between the M and the T components of the rotor current impairs the characteristics of DFIG.The principle and the deficiency were analysed for the feedforward and feedback decoupling,and the decoupling control strategy was discussed based on the Internal Model Control(IMC).Theoretical analysis and simulation results show that,with non-synchronous changes of the parameters,the One-Degree-Freedom IMC(1DOF-IMC) decoupling of DFIG still exists coupling in the rotor current. Because of only one parameter,the adjustment is easy,but there is less effective decoupling.In Two- Degree-Freedom IMC(2DOF-IMC) decoupling method,there are two adjustable parameters,but there is still a compromise selection in robust performance,it is difficult to obtain satisfactory decoupling results.Three- Degree-freedom IMC(3DOF-IMC) decoupling is presented,by the feedforward controller,internal model controller and feedback filter,the 3DOF-IMC decoupling is implemented from multiple directions.The simulation showed that the 3DOF-IMC decoupling method has better decoupling and realizes dynamic decoupling control.更多还原