Research On Power Of The Of Brushless Doubly-fed Machine

Brushless Doubly-Fed Machine (BDFM) is a new type of motor, the induction motor is derived from the cascade. not only The BDFM has a simple structure, run constantly, speed characteristics, and the drive capacity of the advantages is small. but also needing the kind of inverter capacity is small, the power factor control and so on, consequently the variable speed constant frequency generation system and energy-saving control system mechanical have been broad application prospects.In this paper, direct torque control's strategy of the BDFM power applied to the mode is simulated. Firstly, introduced the BDFM's structure , basic principle of the magnetic modulation method, and then using the rotor speed d-q axis drawn the mathematical model, which is built by Matlab/Simulink simulation software to simulate system, to study synchronous, dual-mode and open-loop feed characteristics, simulation results provide the foundation of control of BDFM. On the basis of asynchronous motor DTC(direct torque control) strategy and the principle of BDFM, contrive simulation model of direct torque control system which is based on u-i flux, by observing the speed and torque wave forms in different occasions to verify the BDFM good speed regulation performance. Studying on costumed wind turbines structure and double PWM converter; and then establishing the combined simulation model of BDFM,and then given the result. Finally, a simple designment of the dual PWM frequency control system devices, including the major circuit, controlled circuit, sampling circuit, the speed inspection circuit and the synchronization circuit, using T1 companies TMS320F2812DSP realizes that the simulation of SVPWM waveform.Direct torque control is used in BDFM power system, can achieve tracking the maximum energy control system. The control system lays the foundation for BDFM's wind and hydroelectric power system.