Abstract
When the permanent magnet direct-drive wind power converter system is disturbed by the grid side and the motor side, the output voltage of the converter and the DC bus voltage will change suddenly, and the power quality of the grid will deteriorate. The nonlinear active disturbance rejection controller (NLADRC) is used in the grid-connected inverter control system. Because of its ability to estimate and compensate disturbances, it can effectively improve the system's anti-disturbance ability and tracking accuracy. However, NLADRC still has problems such as many parameters to be adjusted and unclear physical meaning. This article explores the influence of various parameters on the dynamic performance of the entire system, and summarizes the direction and law of parameter tuning. At the same time, the frequency domain analysis method is used to express the gain parameter in the expanded state observer in the form of bandwidth, which provides a basis for parameter adjustment in actual engineering. The control algorithm proposed in this article is applied to the 3MW permanent magnet direct-drive wind power experimental platform. The experimental results under various working conditions show that NLADRC can effectively improve the anti-interference performance of the grid-connected inverter.
Highlights
In recent years, the installed capacity of wind power has gradually increased, and it has occupied a certain proportion in the power grid
Some scholars have analyzed the transient characteristics of permanent magnet synchronous motor (PMSG) and doubly fed induction generator (DFIG) faults, and proposed software and hardware solutions for different types of wind turbines according to their different structural characteristics [5]–[9]; Another research method is to increase the hardware circuit to realize the operation reliability of wind turbine [10]–[16]
The experimental results show that nonlinear active disturbance rejection controller (NLADRC) has stronger anti-interference performance than linear active disturbance rejection control (LADRC) and E-LADRC
Summary
The installed capacity of wind power has gradually increased, and it has occupied a certain proportion in the power grid. Based on the closed-loop transfer function and frequency band characteristic curve of the controller, some scholars analyzed the relationship between the system dynamic characteristics and the controller parameters, and summarized the engineering configuration method of ADRC parameters [29], [30]. In [11], a method of using root locus to study the parameter tuning of linear active disturbance rejection controller is proposed. This article focuses on the analysis of the grid-side converter system and the mathematical model of NLADRC and its anti-interference mechanism, and gives the corresponding design process; with the help of frequency domain method and a large amount of system simulation data, it compares and analyzes the effect of parameter changes on system performance. The effectiveness of the above algorithm is verified on the towing experiment platform, which shows that the NLADRC solution proposed in this article can significantly improve the anti-interference ability of the converter system
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