Research On Adaptive Sliding Mode Control Theory Of Inverter

Inverter is the component that converts DC power into AC power.It is widely used in distributed generation and all kinds of components.In view of the nonlinear and strong coupling characteristics of the inverter,an adaptive sliding mode control(SMC)method is studied.This method integrates the extended state observer(ESO)in active disturbance rejection control with tracking differentiator(TD)and sliding mode reaching law.It not only guarantees the disturbance rejection ability of sliding mode control,but also fundamentally eliminates buffeting problem.At the same time,the introduction of tracking differentiator makes the control method track the real signal and its differential signal.This control is of great value not only in the inverter system but also in the other systems.The main research work of this paper is as follows:(1)This paper describes the development background,process and current situation of the inverter control method,expounds several common control methods of inverters,and points out the existing problems of the existing inverter control methods.This paper introduces the control method of sliding mode control,introduces its concept and principle,and obtains the superiority of its control effect through analysis.At the same time,aiming at the inherent problems of sliding mode control,several solutions were summarized,which laid the foundation for further discussion and research.(2)The control method of extended state observer(ESO),tracking differentiator(TD)and self-learning sliding mode control(self learning sliding mode control)is studied.The introduction of the extended state observer can simultaneously observe the state of the system at the same time,which also solves the problem that some system states are difficult to calculate.The tracking differentiator can track the target value and obtain its differential.The introduction of a class of nonlinear smooth functions can avoid chattering caused by symbol functions.The stability of control and convergence of components are proved by analysis and Matlab simulation is carried out for control.(3)The inverter model has many variables as a nonlinear model,and there is a characteristic of coupling between the variables.Therefore,the switching cycle average model of the inverter is established by using the switching function method,and the inverse system method is used to realize the feedback linearization and decoupling control.An extended state observer can be used to estimate the unknown and uncertain items in the system,which solves the problem of the imprecise model of the pseudo linear system.The tracking differentiator is used to track the quantity,and the differential quantity required for control is obtained.For the designed controller,the control is simulated on the Matlab platform.The simulation results show that the control method has good control effect on the inverter system,and has strong anti-interference ability,and the control quantity has no chattering.