Design Of Genetic Algorithm Based Fuzzy Controller For Buck-Boost Dc-Dc Converters

Abstract

Switch-Mode DC-DC Converters Convert A Direct DC Input Voltage To A Regulated DC Output Voltage Quickly And Effectively. Solid-State Devices Such As Transistors And Diodes Are Used In Switching Power Sources To Act As A Switch, Turning On Or Off Completely. Capacitors And Inductors, Among Other Energy Storage Elements, Are Used For Energy Transfer And Serves As A Low-Pass Filter. So Far, This Has Forced The Use Of More Advanced Control Mechanisms To Fulfill The Actual Demand. For The Control Of DC-DC Converters, A Variety Of Control Approaches Have Been Developed. This Converter Output Voltage Usually Has Oscillation, Large Overshoot, And Takes A Long Time To Settle. It Is Also Unable To Provide The Desired Output Voltage When The Input Voltage And Load Change. Because Of Their Simplicity, PID Controllers Are Commonly Used To Acquire The Desired Output Voltage From Converters. However, In The Case Of Non-Linear Systems, The Use Of A PID Controller Is Not Reliable Or Satisfactory. To Improve System Performance, Non-Linear Controls Are Required. The Proposed GA, GA-Fuzzy Controller, Sliding Mode Controller Based On The Specified Convergence Method Are Proposed And Designed In This Thesis To Achieve Fast And Stable Buck-Boost Converter Performance. The Transfer Function And Mathematical Representation Of A DC-DC Buck Boost Converter For Duty Ratio And Input Change Will Be Obtained. In MATLAB/Simulink, The Modeled System, GA, GA-Fuzzy, And Sliding Mode Controller Are Implemented. It Is Clear That GA Fuzzy, Control Gives The Desired Output Voltage More Rapidly Than GA-PID And SM Control. GA Fuzzy Control Has A Relatively Small Rising And Settling Time, But SM Control Has A Long Rise And Settling Time. The Overshoot Is Reduced From 29.6 % To 0.132% When Using GA-Fuzzy Controller, From 29.6% To 0.515% When Using GA-PID Controller, And From 29.6% To 0.312% When Using Sliding Mode Controller. GA-Fuzzy Controller Is Insensitive To The Input Voltage And Resistance Variation In Terms Of Performance, The Proposed Control Mechanisms Are Compared. The Effectiveness Of Controllers Is Also Tested Under The Influence Of A Random External Disturbance