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Buck型变换器自适应有限时间降压控制算法研究
引用本文:杨晨,程盈盈,都海波,王金平,何怡刚.Buck型变换器自适应有限时间降压控制算法研究[J].自动化学报,2016,42(2):315-320.
作者姓名:杨晨  程盈盈  都海波  王金平  何怡刚
作者单位:合肥工业大学电气与自动化工程学院 合肥 230009
基金项目:国家自然科学基金(61304007,51407054,51577046),教育部博士点基金项目(20130111120007)
摘    要:针对负载未知情况下Buck型DC-DC变换器系统, 基于有限时间控制技术和自适应控制技术, 提出了一种新的快速降压控制算法.首先, 基于时间尺度变换, 对系统的平均状态空间方程进行变换; 然后, 利用饱和有限时间控制理论设计出一类新的快速降压控制算法, 以实现输出电压在有限时间内收敛到参考电压.由于控制器设计过程中考虑了饱和约束条件, 使得变换器的占空比函数满足0到1之间的约束条件.对于负载未知情况, 设计了有限时间观测器以估计未知负载, 最终得到自适应式的有限时间控制算法.与PI控制结果进行了仿真对比, 验证了所提出的控制算法既具有快速的调节性能, 又具有较强的抗负载变化性能.

关 键 词:Buck型变换器    有限时间控制    自适应控制    有限时间观测器
收稿时间:2015-07-08

An Adaptive Finite-time Control Algorithm for Buck Converter Systems
YANG Chen,CHENG Ying-Ying,DU Hai-Bo,WANG Jin-Ping,HE Yi-Gang.An Adaptive Finite-time Control Algorithm for Buck Converter Systems[J].Acta Automatica Sinica,2016,42(2):315-320.
Authors:YANG Chen  CHENG Ying-Ying  DU Hai-Bo  WANG Jin-Ping  HE Yi-Gang
Affiliation:School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009
Abstract:For Buck DC-DC converter systems with unknown load variations, a new voltage regulation control algorithm is proposed by using the techniques of finite-time control and adaptive control. First, a time-scale transformation is used for the average state space model of the Buck converter system. Then, based on the saturation finite-time control theory, a new fast voltage regulation control algorithm is designed which can guarantee that the output voltage converges to the reference voltage in a finite time. Because the saturation constraint is considered during the controller design, the duty ratio function of the converter satisfies the constraint between 0 and 1. For an unknown load, a finite-time convergent observer is designed to estimate the unknown load. Finally, an adaptive finite-time control algorithm is developed. Compared with the PI control algorithm, numerical simulations show that the proposed algorithm has a faster regulation performance and stronger performance on load-variation rejection.
Keywords:Buck converter  finite-time control  adaptive control  finite-time observer
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