The Research Of Control Technology Of Doubly-Fed Induction Generator

With the development of society, human progress and unprecedented prosperity of industrial economy, the energy shortage problems attendant is also commonplace. To find new energy for sustainable development has’become a hot topic of research. Renewable energy instead of fossil energy sources has become a top priority. Wind energy appears to bring a huge boon as a clean and renewable energy in the case of energy shortage situation today. Doubly fed VSCF wind power generation system is compared of the traditional power system with bidirectional power flow, frequency converter has the advantages of small volume, light weight, and low cost advantages, become the focus of current research, widely used in industrial engineering. In this paper, research and analysis of the VSCF doubly fed wind turbine control system.Firstly, this paper analyzes the operation principle of doubly fed induction generator, analyzed three kinds of running status and power flow; by generators convention, derived the mathematical model of DFIG at the three-phase static reference system and the two-phase synchronous rotating reference frame. Secondly, doubly fed induction generator control system control principle of grid side PWM converter control strategy is analyzed, the network side using the grid voltage oriented vector control strategy, established the mathematical model of control strategy. Simulation model is built in Matlab/Simulink simulation environment, and analysis the simulation waveform. The rotor side PWM converter control strategy is analyzed, used the stator flux oriented vector control strategy, established the mathematical model of the rotor side control strategy, simulation model is built on the rotor side control, be simulated, and the simulated waveform is analyzed, to verify the correctness of theoretical analysis. Finally, aiming at the problem of phase accuracy of important link in vector control-phase detection is analyzed, the design and simulation, simulation analysis verifies the feasibility of the improved phase detection method under non ideal grid voltage.