同步BUCK电路中的新型非奇异终端滑模控制性能研究  

Performance study of a new non-singular terminal sliding mode control in synchronous BUCK circuits

作　　者：刘洋[1] 马家庆 吴钦木[1] 何志琴[1] 陈昌盛[1] Liu Yang;Ma Jiaqing;Wu Qinmu;He Zhiqin;Chen Changsheng(School of Electrical Engineering,Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州大学电气工程学院,贵阳550025

出　　处：《电子测量技术》2024年第15期1-7,共7页Electronic Measurement Technology

基　　金：国家自然科学基金(62163006,52267003);贵州省科技厅计划项目(QKHZ[2021]G442,QKHZ[2022]G264,QKHZ[2023]G096,QKHZ[2023]G179)资助。

摘　　要：针对传统滑模控制趋近速度较慢、抖振较大,应用在同步Buck变换器中响应速度较慢、精度较低等问题,提出了一种新型非奇异终端滑模控制的方法。首先对传统的滑模面函数进行了修改,通过引入非线性函数并附上积分项,可以迫使系统快速收敛,从而缩短响应时间。其次在传统趋近律的基础上引入了形式为sigmoid的函数,并用饱和函数来替代符号函数,避免了符号函数在零附近高频切换,因此降低了传统滑模控制带来抖振影响。最后在MATLAB/Simulink仿真平台搭建相应的模型,结果显示,其调整时间为90μs,突加负载后恢复时间为20μs。并通过实验验证,在转速指令发生改变时,所设计的方法调整时间更快,在突加负载后,抗干扰能力更强。The traditional sliding mode control has the problems of slow approach speed,large buffeting,slow response speed and low precision when applied to a synchronous Buck converter.A novel non-singular terminal sliding mode control method is proposed.Firstly,the traditional sliding mode surface function is modified.By introducing a nonlinear function and attaching the integral term,the system can be forced to converge quickly,thus reducing the response time.Secondly,based on the traditional approach law,a function of the form sigmoid is introduced,and a saturation function is used to replace the sign function,which avoids the high-frequency switching of the sign function near zero,and thus reduces the chattering effect caused by the traditional sliding mode control.Finally,the corresponding model is built on the MATLAB/Simulink simulation platform,and the results show that the adjustment time is 90μs and the recovery time after sudden loading is 20μs.The experimental results show that when the speed instruction changes,the proposed method can adjust the time faster,and the anti-interference ability is stronger after sudden loading.

关 键 词：滑模控制 同步Buck电路 改进趋近律 滑模面函数 

分 类 号：TM132[电气工程—电工理论与新技术] TN40[电子电信—微电子学与固体电子学]