The Research Of BUCK Circuit Based On Ant Colony Algorithm Fractional PID Controller

In recent years,with the rapid development of electric vehicles,energy storage and other industries,the control technology for efficient and safe charging of batteries has become a research hotspot.Since the BUCK circuit occupies a small space and is easy to control,it is widely used in charging control and management circuits.The BUCK switching circuit is used to study the constant current charging control of multi-batteries.This dissertation studies and deduces the algorithm for solving the state equation established by the BUCK circuit and battery model based on the Differential Quadrature Method(DQM),and realizes the state observation and modeling of BUCK circuits.This dissertation analyzes the shortcomings of the traditional PID controller in the BUCK control.The application of the fractional-order PID controller with more freedom of control to the BUCK circuit is studied.The feedback control of the constant current charging of multiple batteries is studied.In the BUCK charging circuit,based on the integrated time absolute error criterion(ITAE)as the objective function,this dissertation studies and proposes the parameter optimization method of the fractional PID controller based on ACA(Ant Colony Algorithm).The simulation results show that the optimization method can make the output current of BUCK charging circuit quickly reach the stability,the adjustment time is shorter and the output transient process is relatively better,that have verified the relative superiority of BUCK circuit charging control based on ACA-Fractional PID.