基于终端滑模和扰动观测的Buck型变换器复合控制技术
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国家自然科学基金项目(61573170、31571571)、江苏省高校优势学科建设工程项目、江苏省杰出青年基金项目(BK20180045)和安徽省教育厅自然科学基金项目(KJ2016A760)


Composite Controller Design for Buck Converters Based on Terminal Sliding Mode and Disturbance Observer
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    摘要:

    目前功率变换器的控制方法以纯状态反馈为主,当干扰较大时一般需要通过较大的增益来抑制干扰的影响,而高增益控制器通常会影响闭环系统的动态或稳态性能。为进一步提高Buck型变换器控制系统的动态和稳态性能,提出了一种基于非奇异终端滑模控制方法和扰动观测技术的复合控制方案。首先,考虑外界干扰、系统不确定以及参数变化的影响,建立Buck型功率变换器的平均状态模型;其次,基于非奇异终端滑模控制方法,设计滑模控制器,实现Buck型变换器的基本电压调节功能;最后,利用扰动观测技术,构造非线性扰动观测器实现对扰动的观测,并将扰动观测值作为前馈与状态反馈结合形成复合控制,进一步改善了系统的性能。仿真和实验验证了所提方法的有效性。

    Abstract:

    It can be seen from the literature that the existing control methods for the control of DC-DC Buck converters are mostly based on the pure state feedback. When the disturbances are large, the gains of the controllers are usually required to be tuned large enough so as to suppress the adverse effects of disturbances, while the large gains usually affect the dynamic and steady-state performance of the closed-loop systems. To tackle this problem, a composite control scheme was proposed by combining the terminal sliding mode and disturbance observer techniques to further improve the dynamic and steady-state performance of Buck converter’s control system. First of all, taking the external disturbance, system uncertainties and parameter perturbations into account, the average state model of DC-DC Buck converters should be firstly built. On this basis, a sliding mode controller by virtue of the non-singular terminal sliding mode control technique was designed for the Buck converter such that the fundamental voltage regulation can be implemented. Finally, by applying the disturbance observer technique, a nonlinear disturbance observer was constructed to estimate the unknown disturbance, and the estimated value as the feedforward term plus the state feedback constitute the composite controller, which can further improve the performance of the closed-loop system. Simulation and experimentation results verified the effectiveness of the proposed method.

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高伟,倪媛媛,丁世宏.基于终端滑模和扰动观测的Buck型变换器复合控制技术[J].农业机械学报,2018,49(12):387-392,428. GAO Wei, NI Yuanyuan, DING Shihong. Composite Controller Design for Buck Converters Based on Terminal Sliding Mode and Disturbance Observer[J]. Transactions of the Chinese Society for Agricultural Machinery,2018,49(12):387-392,428.

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  • 收稿日期:2018-06-29
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  • 在线发布日期: 2018-12-10
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