The switched-mode DC-DC converters are among the most widely used power electronic circuits for their high conversion efficiency and flexible output voltage. These converters, used for electronic devices, are designed to regulate the output voltage against the changes of the input voltage and load current. So far this leads to the requirement of more advanced control methods to meet the real demand. Many control methods are developed for the control of DC-DC converters. The output voltage of this converter alone is usually unstable, with high oscillation, large overshoot and long settling time. Moreover, it is unable to provide the desired output voltage for input voltage and load variations. To overcome this problem and obtain constant, stable output voltage and fast system response various controllers are required. In this thesis Fuzzy PID controller and integral sliding mode controller based on the prescribed convergence algorithm is proposed and designed to achieve fast and stable performance of the buck-boost converter. Mathematical representation of a DC-DC buck-boost converter will be obtained. The modelled system, Fuzzy PID and integral sliding mode approaches are implemented in MATLAB/Simulink. The proposed control strategies compare with each other in terms of performance indexes. The performances are integral square error (ISE), integral absolute error (IAE), integral time square error (ITSE) and integral time absolute error (ITAE).Furthermore, to test the performance of proposed controllers the load resistance is increased and decreased by 35.72% from operating point while desired output voltage is decreased by 50% and increased up to 33.33% from operating point. Also, the effectiveness of both controllers is tested under the influence of external random disturbance.
DESIGN OF INTEGRAL SMC AND FUZZY PID CONTROLLER FOR VOLTAGE CONTROL OF A DC-DC BUCK-BOOST CONVERTER
2019-10-18
doi:10.20372/nadre/4169
Theses
Electronic Resource
English
DDC: | 629 |
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