双馈感应发电机的输入输出线性化解耦控制

Decoupling Control of Doubly Fed Induction Generator Using Input-output Linearizing Method

在双馈风力发电系统数学模型的基础上,提出基于输入输出线性化解耦控制的非线性控制策略。通过非线性坐标变换和非线性状态反馈,实现了双馈风力发电系统的输入输出线性化,达到了双馈感应发电机的有功功率、无功功率在稳态和动态情况下完全解耦的控制目标,提高了系统的动态性能,提升了响应速度,减小了功率纹波。所设计的非线性控制律仅与发电机电感的比值有关,提高了控制系统的参数鲁棒性。在7.5kW双馈风力发电测试平台上进行了验证,实验结果表明,双馈风力发电系统的输入输出线性化解耦控制策略优于传统的矢量控制策略。

Based on the mathematical model of the doubly fed induction generation system,a nonlinear control algorithm using the input-output linearizing and decoupling control strategy is introduced.By using nonlinear coordinate transform and state variable feedback control laws,the input-output linearization of the doubly fed generation system is implemented,the full decoupling of active and reactive power under both steady state and transient state is achieved,and the dynamic performance of the system is improved,which is represented by faster response speed and smaller ripples of system active and reactive power.Since the proposed nonlinear control law only relates to the ratio of generator inductance,the parameter robustness of the control system is improved.The control strategy is implemented and tested by a 7.5 kW wind power generation test rig,and the experiment results validate that the input-output linearizing and decoupling control scheme is superior to the conventional vector control scheme.