Wind Power Grid-connected Converter Fault Simulation Experiment Platform Design And Implementation

Wind turbines often work in remote area,where harsh complex environments make grid-connected converters malfunction.As the energy exchange link between the grid side and the machine side of the wind power generation system,the converter is very important for the stable operation of the system.Therefore,it is of great significance to establish an experimental platform capable of realizing fault simulation of wind power grid-connected converters.Benefits from the experimental platform capable,it is easier to make the in-depth analysis of fault characteristics of the converter and design new fault diagnosis methods.This article relies on the National Natural Science Foundation of China's project "Study on Fault Feature Extraction and Diagnosis of Wind Power Grid-connected Converters" to design and develop a 2.5 kW wind power grid-connected converter fault simulation experiment platform.In the process of designing and implementing this fault simulation platform,this paper mainly completed the following work:Firstly,the basic concept of grid-connected converter and its development status are analyzed.Then the fault diagnosis methods for grid-connected converters are classified and summarized,and the failure simulation of the grid-connected converter fault simulation platform is determined.Types and types of fault signals completed the preliminary requirements analysis of the platform design,and determined that the permanent magnet direct-drive wind power system with greater development potential is the research object.Then,the mathematical modeling and control strategy simulation analysis of permanent magnet direct-drive wind power generation system was carried out.The simulation model of 2.5 kW permanent magnet direct-drive wind power generation system was built using Simulink platform in Matlab.The simulation results showed the established mathematical model and The rationality of the control strategy.Finally,according to the previous system demand analysis and theoretical modeling,a small-scale wind power grid-connected converter fault simulation experiment platform was built.The fault simulation platform uses an inverter to drive an asynchronous motor to simulate the fan torque input;the TMS320F28335 controller with excellent computing and memory performance realizes the double closed-loop control on the machine side and the network side;the use of multiple contactor groups and the soft turn-off method The fault injection of different types of grid-connected converters is realized;finally,an FPGA-based multi-channel sampling board is used to achieve rapid collection and storage of various types of characteristic signals.