双馈风力发电系统的非线性解耦控制

Nonlinear control of wind power generation based on DFIG

为了克服双馈风力发电系统基于近似线性化模型的分离控制方法动态性能差,抗扰能力弱的缺点,研究了双馈风力发电系统的精确线性化解耦控制.首先从电力电子装置与电机系统集成的角度,建立了双馈风力发电系统的统一模型;然后应用逆系统理论,推导出其逆系统模型,将其精确线性化成一个伪线性系统;最后运用内模控制理论对其进行综合以提高系统的鲁棒性,实现了双馈风力发电系统的高性能控制.仿真和实验结果表明,该控制策略不仅可以加快系统的响应速度,保证系统的全局稳定性,而且还可以减少所需的直流滤波储能电容,提高系统可靠性.

To deal with the undesirable performance and the low disturbance-rejection of the separated control for a double-fed induction generation（DFIG） based on a simplified model; we propose an accurately linearized decoupling control for the DFIG. First, we develop an integrated model for the assembly of electronic devices and the DFIG, and then, derive its inverse model by using the inverse system theory. This inverse model is then accurately linearized and installed in front of the original system. Thus, a pseudo linear system is developed, which is then synthesized based on the intemal-model-control（IMC） theory to improve the robustness, realizing a high-performance control for the DFIG. Simulation results and experimental data validate the desirable performance and high robustness, the suppression of dc-bus voltage fluctuations, the reduction of the size of electrolytic capacitor, and the enhancement of the reliability of the wind generation system.