Study On The Converter System For Wind-Driven Doubly-Fed Generator

Now, energy sources consume increasing daily and environment empoison being serious gradually, wind power, as renewable, no pollution energy source, is paid great attention by more and more countries. The technology also become research hotspot of many country's scholar.Firstly, this thesis analyzes DFIG operation theory, including mathematic model of DFIG coordinate transformation which establishes the theoretical foundation for succeeding study. The state of the DFIG and the direction of power flow under different wind speed are analyzed.Secondly, on the part of taking control strategy, to the inverter, in order to realize decoupled control of DFIG active and reactive power, field oriented vector control technique was applied to DFIG control. A general control strategy based on stator flux oriented vector control was proposed as well. The rectifier is controlled to keep the voltage of the DC loop to be constant and to keep the power factor to be unit.At last, in order to testify the validity of the basic theory and the control strategy proposed by the antecedent part, a series of research of simulation and experiment have been carried out on VSCF wind power generation system. A simulation platform of VSCF wind power generation system was founded by Matlab/Simulink. The hardware structure of the DFIG is designed and the function of some control modules are introduced.