Finite Time Current Tracking Of New Energy Microgrid Grid-connected Inverter

The application of new energy is a very promising field,but there are also many challenges.It is an important issue to suppress the peak resonance effectively and track the grid connected current accurately and quickly.This thesis makes the following work for fast tracking of grid connected current.Firstly,in order to better analyze and control the current of LCL grid connected inverter,using Kirchhoff’s theorem of current and voltage,the mathematical model of LCL grid-connected inverter is established.Afterwards,the controller based on sliding mode control with fast tracking of grid connected current is given under ideal grid condition.By Lyapunov stability theorem,the stability of the controller is analyzed.The effectiveness of the controller is proved by Matlab/Simulink simulation.Finally,considering the problem of grid impedance uncertainty and voltage disturbance in the non ideal grid,a sliding mode controller is designed for fast tracking grid-connected current in non-ideal state.At the same time,the stability of the controller is analyzed by using Lyapunov stability theorem.Through Simulink simulation,it is proved that the current time of grid connection is limited under the condition of non-ideal grid and the effectiveness of fast tracking.