Improved Linear Active Disturbance Rejection Control of Wind Power Inverter Based on Filter Function

Abstract

In view of the problem that the DC bus voltage measurement link of grid connected inverter in wind power system is easy to be polluted by noise, this paper combines the linear active disturbance rejection control with the filter to construct an improved linear active disturbance rejection control technology based on the filter function. Firstly, the mathematical model of wind power grid connected inverter is constructed, and the traditional LADRC is analyzed. In order to improve the rejection of the LADRC to the high frequency noise, the filtered voltage is expanded into a new state variable, and the voltage filtering is estimated by using the linear extended state observer as the feedback. Considering the noise in the system output, the frequency characteristics of the improved LADRC are analyzed. The results show that the improved control strategy has better noise suppression ability. Finally, the feasibility and effectiveness of the control strategy is verified through the establishment of the simulation platform of the grid connected inverter of the wind power system.