Duty Cycle Prediction Control Technique For A DC-DC Buck Converter Based On Dominant Poles Location

Lau, Khai Xin (2017) Duty Cycle Prediction Control Technique For A DC-DC Buck Converter Based On Dominant Poles Location. Project Report. UTeM, Melaka. (Submitted)

Text Duty Cycle Prediction Control Technique For A DC-DC Buck Converter Based On Dominant Poles Location - Lau Khai Xin - 24 Pages.pdf - Submitted Version Download (441kB)

Abstract

The DC-DC converter is designed by controlling the input voltage using switch mode configuration to obtain a desired DC output voltage. DC-DC converter are divided into three types which are buck converter, boost converter and buck-boost converter. A feedback control strategy is needed to accomplish the DC-DC converter system to produce good transient response and zero steady-state error. The objective of this project is to do system modelling on DC-DC buck converter. Since the aim of this project is to achieve good transient response and zero steady-state error, a feedback controller which is modified PID controller is formulated in order to predict a duty cycle for DC-DC buck converter which called as Duty Cycle Prediction Control Technique. Finally, to analyse the transient response and steady-state error of the DC-DC buck converter. There are two methods to work on system with and without controller and for duty cycle prediction. The first method is by modeling the system and second method is by using real plant. For the first method, the modeling on DC-DC buck converter has been done to obtain the transfer function of plant system. The step response and root locus of the system with and without controller has been obtained by using coding in the MATLAB. Meanwhile, good transient response and zero steady-state error by Duty Cycle Prediction Control Technique has been verified by using MATLAB/Simulink. For the second method, there are three cases have been tested which were changes in reference voltage, load and input voltage on system with and without controller. A modified PID controller has been designed and constructed. The derivative time, derivative gain and gain value has been obtained by using root locus technique. The algorithm used in the duty cycle prediction has been derived by using the partial fraction method based on the dominant poles location. Eventually, the modified PID controller has been inserted into the system with controller and duty cycle prediction. From the result, the proposed idea, Duty Cycle Prediction Control Technique has been successfully perform the case change in reference voltage. It produced good transient response and zero steady-state error. Therefore this technique can be used as the new feedback control technique.

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