Nonlinear Disturbance Rejection Control for A Buck-Boost Converter With Load Uncertainties
For the problem of adaptiveness degradation of Buck-Boost converters in the presence of load uncertainties,a nonlinear disturbance rejection control method is proposed based on a load disturbance estimation.Firstly,a disturbance observer is constructed to estimate the disturbances caused by load uncertainties.Then,the inductance current tracking signal which ensures offset-free tracking of the output voltage is designed based on the disturbance observation value.Finally,a nonlinear disturbance rejection control approach is proposed by using the feedback linearization technique.The proposed control method can effectively address the problem of nonlinearities and non-minimum phase characteristic involved in the system when the capacitor voltage is taken as the system output.It could also overcome the undesirable influence on the output voltage caused by the uncertainty of load change.In addition,the method can effectively avoid the singularity problem led by current zero-crossing when using the duty ratio to control the output voltage directly.The simulation results show that the proposed control strategy guarantees fast output voltage regulation and offset-free tracking performance even in the presence of sudden load changes.This will eventually improve the adaptive property against load changes for the Buck-Boost converter system.
Buck-Boost converter disturbance rejection control non-minimum-phase load uncertainty disturbance observer
CUI Hongyu YANG Jun LI Shihua
School of Automation,Southeast University,Key Laboratory of Measurement and Control of CSE,Ministry of Education,Nanjing 210096,Jiangsu
国际会议
The 33th Chinese Control Conference第33届中国控制会议
南京
英文
3788-3793
2014-07-28（万方平台首次上网日期，不代表论文的发表时间）