A Large-signal Model And Inverse System Decoupling Control Of Boost Convertor

With the development of new energy distributed DC power supply system,The DC-DC converter must be adapted to the requirements of randomness and intermittent power conversion.That is,the converter will be in a non-stationary state for a long time,The working point is constantly changing.So it is the key to ensure the stability of the output voltage and improve the performance of the converter to improve the anti-interference ability of the DC-DC converter to the input voltage.Because of the inherent limitation of the small signal modeling and linear feedback control of DC-DC converter,it is difficult to realize the stable control and high dynamic response performance of the converter.Therefore,for the characteristics of DC-DC converter under large disturbance conditions,it is necessary to use the large signal model to describe the nonlinear characteristics of the system;The disturbance decoupling,the decoupling of the voltage loop and the current loop,the decoupling of the control variables and the output variables must be solved.In this paper,the Boost converter is taken as the main research object,and the modeling of non-ideal Boost converter in the continuous state is established in the process of modeling,the parasitic resistance of inductor and the parasitic resistance of output filter capacitor is considered.Based on Boost converter large signal model is proposed and a new control method-inverse system decoupling control,the inverse system decoupling control method are discussed in detail,finally analyzed in Boost converter through inverse decoupling control system can be the relationship between the voltage loop and current loop to decoupled so,they are independent of each other without interference.Then,the voltage loop and current loop are designed by ITAE method respectively,and the optimal control parameters are obtained,To analyze the stability of the model was set up using the map.The closed-loop system model of Boost converter is built in the MATLAB/simulation analysis,validation of the Boos converter of inverse system decoupling control theory the correctness of modeling analysis,and compared with the simulation results of conventional Boost converter under the control of the PID,results show that using inverse system decoupling control of Boost converter in better robustness power disturbance and load disturbance.Finally,according to the inverse system circuit model,the object is fabricated to verify the correctness of the theory.