Control of Buck converter based on adaptive nonsingular terminal sliding mode
In order to improve the control performance of Buck converters under sliding mode control and reduce chattering,an adaptive nonsingular terminal sliding mode control method is proposed.Firstly,the Buck converter is modeled and analyzed to obtain the mathematical model in the pres-ence of disturbance.Secondly,a nonsingular terminal sliding mode surface is designed,as well as the controller design and stability analysis are carried out to make the closed-loop system converge in finite time and avoid the control singularity problem.At the same time,the adaptive law is used to obtain the dynamic control gain as small as possible and sufficient to suppress the disturbance to weaken the chattering.Finally,the effectiveness of the proposed control method is verified by theo-retical analysis and simulation.The results show that the proposed control method can make the output voltage of the Buck converter track the reference voltage in finite-time with the chattering problem attenuated.In addition,when the load resistance and input voltage of the Buck converter change abruptly,the proposed control method also shows good anti-disturbance ability.
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