摘要
为了进一步提高变换器的输入功率因数,避免峰值电流模式控制下可能产生的不稳定现象,设计一种适用于单相升压式变换器功率因数校正的滑模控制策略。首先建立Boost变换器的数学模型,根据理想状态下系统输入和输出功率的平衡关系,获得电感电流参考指令最大值;然后采用积分滑模面,设计系统的控制策略;最后根据面积等效原理,将所设计的控制函数转换为PWM控制,控制变换电路器件的通断,提高Boost PFC的动稳态性能。仿真验证表明,该方法能够在系统输入电压和负载变化的情况下保持较高功率因数以及较小谐波畸变率。
To improve the input power factor of the converter and avoid unstable phenomena under the peak current mode control,a sliding mode control method is designed in this paper.Firstly,the dynamic model of Boost converter is established,and the inductance current reference is obtained according to the relationship between input and output power in ideal state.The integral sliding mode surface is built and the control strategy is designed.According to the principle of equivalent control,the control function is converted into equivalent PWM control,which can be used to control of the electronic device on/off.The dynamic and stable performance of Boost converter can be improved.The simulation results show that this method can be used to keep the power factor higher and the total harmonic distortion smaller under the variance of input voltage and load of the system.
作者
王冬
游超
周照宇
王麒云
WANG Dong;YOU Chao;ZHOU Zhaoyu;WANG Qiyun(College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China)
出处
《机械制造与自动化》
2019年第2期184-187,共4页
Machine Building & Automation
关键词
滑模变结构
功率因数校正
BOOST变换器
谐波畸变率
sliding mode variable structure
power factor correction
Boost converter
total harmonic distortion
