基于LESO的DFIG-GSC反馈线性化直接功率控制  

DFIG-GSC feedback linearization direct power control based on LESO

作　　者：王凯 董锋斌[1] 王豪 史新涛 WANG Kai;DONG Fengbin;WANG Hao;SHI Xintao(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：《陕西理工大学学报（自然科学版）》2024年第1期10-19,共10页Journal of Shaanxi University of Technology:Natural Science Edition

基　　金：陕西省自然科学基础研究计划项目(2023-JC-YB-442)。

摘　　要：为了提高双馈风力发电机网侧变换器(DFIG-GSC)这个强耦合非线性系统的性能,提出了一种反馈线性化直接功率控制策略。首先在αβ坐标系下建立以有功功率、无功功率为变量的DFIG-GSC的数学模型,针对模型中的强耦合项采用反馈线性化进行解耦,得到其线性模型,再结合滑模控制理论设计出功率内环的控制律。由于功率内环控制律中未建模部分和不确定因素会对控制效果产生影响,采用线性扩张状态观测器对其进行观测并对其控制量进行修正。同时电压外环采用滑模控制来提高直流侧电压的响应速度。最后搭建仿真模型与传统PI控制以及直接功率控制进行比较,验证了所提控制策略的合理性和有效性。A feedback linearization direct power control strategy is proposed to improve the performance of doubly fed indution generator grid side converter(DFIG-GSC),a strongly coupled nonlinear system.Firstly,a mathematical model of DFIG-GSC with active power and reactive power as variables in theαβcoordinate system was established.The strong coupling term in the model is decoupled by feedback linearization,and the linear model is obtained.Combined with the sliding mode control theory,the control law of the power inner loop is designed.Because the unmodeled parts and uncertain factors in the power inner loop control law will affect the control effect,the linear extended state observer(LESO)is used to observe it and modify its control quantity.At the same time,sliding mode control is used in the outer voltage loop to improve the response speed of DC side voltage.Finally,the simulation model is built and compared with the traditional PI and direct power control to verify the rationality and effectiveness of the proposed control strategy.

关 键 词：双馈风力发电机 变换器 直接功率 反馈线性化 线性扩张状态观测器 

分 类 号：TM46[电气工程—电器]