基于反馈精确线性化解耦的FMSS改进滑模控制策略
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TM564

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国家自然科学基金资助项目(51877215);山东省自然科学基金资助项目(ZR2019MEE094)


Improved sliding mode control strategy for flexible multi-state switch based on feedback accurate linearization decoupling
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    摘要:

    柔性多状态开关(flexible multi-state switch,FMSS)存在非线性和强耦合的特点,传统的比例积分(pro ̄por ̄tional integral,PI)控制难以实现输出功率的完全解耦,且存在PI参数调节困难、系统动态响应速度慢及鲁棒性差等问题。文中首先利用反馈精确线性化将FMSS由高阶非线性系统转化为2个完全独立的一阶线性系统,实现了有功和无功电流的完全解耦;然后针对传统滑模控制(sliding mode control,SMC)趋近速度慢、系统收敛性能差以及运动抖振大等问题,设计了一种基于自适应趋近率的改进SMC算法,对电压外环和电流内环进行优化,并通过Lyapunov函数研究了所提算法的稳定性;最后在Simulink软件中,对三端口FMSS在输出功率扰动、交流电压暂降及系统参数摄动等工况下进行仿真分析,结果表明所提控制策略增强了系统的鲁棒性和抗干扰能力,可有效提升系统的动态响应速度。

    Abstract:

    Flexible multi-state switch (FMSS) has the characteristics of nonlinearity and strong coupling. It is difficult to achieve complete decoupling of output power through traditional proportional integral (PI)control. There are some problems in PI control such as difficulty in adjusting PI parameters,slow system dynamic response speed,and poor robustness. Firstly,feedback accurate linearization is uesd to transform the FMSS from a high-order nonlinear system into two completely independent first-order linear systems,realizing the complete decoupling of active and reactive currents. Then,aiming at the problems of slow approach speed,poor system convergence performance and large motion chattering of traditional sliding mode control,an improved sliding mode control based on adaptive approach rate is designed to optimize the voltage outer loop and the current inner loop,and the stability of the proposed algorithm is verified by Lyapunov function. Finally,the simulation analysis of the three-port FMSS are carried out in the Simulink software under the conditions of output power disturbance,AC voltage sag and system parameter perturbation. The results show that the proposed control enhances the robustness and anti-interference ability of the system,and it can effectively increase the dynamic response speed of the system.

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马文忠,余欢,李维国,孟繁丞,刘星宇,么旻蕊.基于反馈精确线性化解耦的FMSS改进滑模控制策略[J].电力工程技术,2023,42(3):92-101

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历史
  • 收稿日期:2022-12-05
  • 最后修改日期:2023-01-29
  • 录用日期:2022-09-16
  • 在线发布日期: 2023-05-19
  • 出版日期: 2023-05-28