基于扩张状态观测器的DFIG网侧变换器滑模控制  

Sliding mode control for DFIG grid-side converter based on extended state observer

作　　者：董锋斌[1] 刘昌建 赵永玮 皇金锋[1] DONG Fengbin;LIU Changjian;ZHAO Yongwei;HUANG Jinfeng(School of Electrical Engineering,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学电气工程学院,陕西汉中723000

出　　处：《电力工程技术》2023年第2期206-214,共9页Electric Power Engineering Technology

基　　金：陕西省自然科学基础研究计划资助项目(2023-JC-YB-442);陕西省技术创新引导专项计划资助项目(2022QFY08-05)。

摘　　要：针对双馈风力发电机网侧变换器因负载变化和滤波参数摄动导致控制效果不佳的问题,文中提出一种扩张状态观测器(extended state observer,ESO)与滑模控制相结合的网侧变换器双闭环控制策略,内环采用以功率为状态变量的基于ESO的滑模直接功率控制,外环采用以电压平方为状态变量的基于ESO的滑模控制。首先,应用ESO对系统状态变量与包含系统未建模动态、负载变化和滤波参数摄动等不确定项进行估计,无需系统的精确数学模型即可设计滑模控制方法,实现网侧变换器在复杂环境下的鲁棒控制。此外,引入功率差前馈环节,可减小负载变化时外环滑模控制非线性带来的冲击。最后,对负载变化和滤波参数摄动2个算例进行仿真。结果表明,与传统矢量控制和滑模控制相比,所提控制策略在复杂环境下具有更强的鲁棒性。Aiming at the problem of poor control effect of grid-side converter of doubly-fed induction generator due to load change and filter parameter perturbation,a double closed-loop control strategy of grid-side converter based on extended state observer(ESO)and sliding mode control is proposed.The inner loop adopts ESO-based sliding mode direct power control with power as the state variable,and the outer loop adopts ESO-based sliding mode control with voltage square as the state variable.Using ESO to estimate the system state variables and lumped uncertainties including unmodeled dynamics,load variation and filter parameter perturbation of the system,the sliding mode control method can be designed without the accurate mathematical model of the system to realize the robust control of grid-side converter in a complex environment.In addition,the power difference feedforward link is introduced to reduce the impact of the nonlinearity of the outer loop sliding mode control when the load changes.Finally,two examples of load charge and filter parameter perturbation are simulated,and the results show that the proposed control strategy has stronger robustness in the complex environment than traditional vector control and sliding mode control.

关 键 词：双馈风力发电机 网侧变换器 扩张状态观测器(ESO) 滑模控制 直接功率控制 功率差前馈 双闭环 

分 类 号：TM46[电气工程—电器]