Research On The Grid Side Converter Of Double Fed Induction Wind Power System

Wind as a renewable energy, are attracting more and more attention, the studying of wind power technology has become more deeper and maturer, the variable pitch VSCF wind power technology to be the trends in the future, and the Doubly-fed induction wind power technology used in a growing number of large-scale wind power equipment. Compared to permanent magnetic direct-drive system, the converter of Doubly-fed induction generator exchange only need 1/4 of the power conversion, and thus have been widely used because of cost advantages in the VSCF wind power systems. This topic is the research and analysis of gird-side converter in Doubly-fed induction wind power system on these back-ground.This paper discussed the developing situation of wind power technology, analysed the working principle of Doube fed induction wind power system. And then compared with different controling strategy of grid -side converter in Double fed induction wind power system, bulit the mathmatic model and controling diagram based in Voltage and current closed-loop strategy. Using the Matlab/Simulink software get the simulation results when the converter working in unit power factor rectify and inversion, the changing from rectify to inversion and removing load suddenly. Simulation results show the correction and validity of the mathematical model and the controlling strategy.On this basis, a DSP-cored structure (TMS320LF2407A) of grid-side converter control circuit has been builded. The experimental results show that the controling of Voltage and current closed-loop strategy inplement the DC-side voltage tracking given value, active current and reactive currents independent controling and the energy bidirectional flow effectively. The hardware circuit of the system implements the protection of fault detection automaticly and the SVPWM output control functions.