引入负载扰动观测的Boost变换器定频滑模控制
Fixed-frequency Sliding Mode Control with Load Disturbance Observation for Boost Converter
许加柱 1王家禹 1刘裕兴 1曾林俊 1梁志宏 1钟朝峰1
作者信息
- 1. 湖南大学电气与信息工程学院,长沙 410082
- 折叠
摘要
针对传统线性控制方法下 Boost 变换器存在系统动态性能差和对负载扰动鲁棒性不强的问题,从功率平衡的角度提出 1 种定频滑模电流控制方法.首先,利用负载电流观测值计算维持输出电压稳定所需的输入功率;其次,通过控制电感电流调整变换器输入功率,从而将系统的状态轨迹限制在对负载扰动具有不变性的滑模面上,保证系统大信号稳定并提升其动态性能;最后,基于等效控制原理,通过 PWM 技术实现等效滑模控制,避免了传统滑模控制中存在的抖振及开关频率不稳定问题.在Simulink中对Boost变换器负载阶跃变换的工况进行仿真,将所提方法与传统线性控制方法对比.结果表明,采用所提方法,系统的动态性能更好,且能保证系统在负载大范围扰动下的大信号稳定.
Abstract
The traditional linear control method for a Boost converter has a poor dynamic performance and weak robustness to load disturbance.To solve this problem,a fixed-frequency sliding mode current control method based on power balance is proposed.First,the observed value of load current is used to calculate the input power,which is required to maintain the stability of output voltage.Then,the input power of the converter is adjusted by controlling the inductor current,so that the system's state trajectory is restrained on the sliding mode surface that possesses invariance to load disturbance,thus ensuring the system's large signal stability and improving its dynamic performance.Finally,based on the equivalent control principle,the equivalent sliding mode control is achieved through the PWM technique to avoid problems of chattering and unstable switch frequency.Simulations of the Boost converter under the condition of step load change are carried out in Simulink,and the proposed method is compared with the traditional linear control method.Results show that when using the proposed method,the system's dynamic performance is better and its large signal stability under large load disturbances is guaranteed.
关键词
Boost变换器/等效滑模控制/负载扰动/功率平衡/大信号稳定Key words
Boost converter/equivalent sliding mode control/load disturbance/power balance/large signal stability引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据