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| Composite control method for non-minimum phase single inductance dual output Buck-Boost converter |
Jinfeng HUANG( ),Xiaotian LI |
| School of Electrical Engineering, Shaanxi University of Technology, Hanzhong 723001, China |
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Abstract An control strategy combining improved non-singular fast terminal sliding mode (NFTSM) and active disturbance rejection control (ADRC) based on the extended state observer (ESO) of energy storage function was proposed, in view of the cross-influence and non-minimum phase characteristics of single inductance dual output Buck-Boost (SIDO Buck-Boost) converters operating in continuous inductance current mode (CCM). Firstly, the main controller was designed, and the ADRC normal form was obtained by fitting the transfer function of the system, which was used to decouple the main path. Secondly, the branch controller was designed, and the improved ESO was used to observe the energy function, and the observed value was compensated into the non-singular fast terminal sliding mode control law to achieve the branch decoupling effect. The approach law was improved in order to suppress the chattering problem of sliding mode control. Then, the stability of the system was proved by the Lyapunov theory. Finally, experiments were carried out based on the hardware-in-the-loop (HIL) experimental platform, and results showed that the proposed control strategy had better effect on overshoot and response time than PI control strategy and ESO-based sliding mode control strategy.
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Received: 01 June 2023
Published: 25 May 2024
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| Fund: 陕西省自然科学基金资助项目(2023-JC-YB-442). |
非最小相位的单电感双输出 Buck-Boost变换器的复合控制方法
单电感双输出Buck-Boost (SIDO Buck-Boost)变换器在电感电流连续模式(CCM)下工作存在交叉影响以及非最小相位特性的问题. 为了解决上述问题，提出基于储能函数的扩张状态观测器(ESO)的改进非奇异快速终端滑模(NFTSM)和自抗扰控制(ADRC)相结合的控制策略. 设计主路控制器，对系统的传递函数进行拟合得到ADRC范式，利用该范式对主路进行解耦控制.设计支路控制器，采用改进型ESO对储能函数进行观测，并将观测值反馈补偿到非奇异快速终端滑模控制律中，达到支路解耦的效果. 为了抑制滑模控制的抖振问题，对趋近律进行改进. 利用Lyapunov理论证明系统稳定性. 基于硬件在环(HIL)实验平台进行实验验证. 结果表明，所提控制策略与PI控制策略以及基于ESO的滑模控制策略相比，在超调量和响应时间上具有较好的效果.
关键词：
单电感双输出,
Buck-Boost变换器,
非奇异快速终端滑模控制,
自抗扰控制,
改进滑模趋近律
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