Grid Connected Operation And Control Of Dual Stator-Winding Induction Generator Wind Power System Based On Virtual Synchronous Generator

The problem of energy shortage and environmental protection greatly promoted the development of wind power.Stator double winding asynchronous generator,which has the advantages of high reliability,small volume,easy maintenance and other characteristics,has been widely concerned.Dual stator winding induction generator connects to the grid through the inverter,which based on virtual synchronous generator control to improve power generation system and good friends;in the process of grid connected operation,inverter must have low voltage ride through capability.This paper bases on the control of virtual synchronous generator in stator double winding asynchronous generator and low voltage ride through,which mainly includes the following content:First of all,the mathematical model of dual stator winding induction generator stator winding induction generator system,through the decoupling of the control winding current,employs the voltage outer loop and current inner loop of the double loop control strategy to ensure the stability of the output voltage of the generator.On this basis,the mathematical model of the virtual synchronous generator establishes the relationship between active power and frequency,phase angle,the model also establishes the relationship between reactive power and the voltage amplitude,pre synchronization control strategy realizes the smooth integration of the virtual synchronous generator.Finally,the simulation based on Matlab/simulink is used to verify the correctness of the virtual synchronous generator in stator double winding asynchronous generator.Based on the virtual synchronous generator control technology integration,the mathematical model of the inverter under grid fault is established,the article puts forward the PR current controller algorithm to realize switching control algorithm and virtual synchronous generator,and to realize virtual synchronous generator low voltage ride through under grid fault.When the power system fault occurs,the switching control algorithm to limit the output current,and provide reactive power.Phase synchronization realizes smooth switching through the fault state to the normal state.On the other hand,when the fault state changes to a normal state,after the end of the power grid fault 50 ms to 200 ms,switch can be directly carried out to make the system run in the normal grid.Finally,simulation results based on Matlab/Simulink are used to verify the correctness and effectiveness of virtual synchronous generator low voltage ride through.The system hardware and software is designed.The hardware includes the selection of the power devices,the design of control side filter inductance,DC capacitor design and excitation capacitor,the analysis of the key parameters and control circuit of the generator side.The software completed the initialization procedure,the sampling voltage and current,the calibration data and the first-order inertial filter,directional angle calculation,coordinate transformation,digital hysteresis control.Finally,a prime mover instead of wind turbine drive generator is realized the dual stator winding induction generator for power generation.