Research And Engineering Design On Dual PWM Converter Used In Doubly-Fed Wind-Power Generation System

With the increasingly non-renewable energy consumption and pollution problem brought by fossil fuel burning, people have to consider the development and utilization of renewable energy. Due to the wind powers unique advantages, it’s attracted the worldwild attention and has become a world hot spot.The adoption of doubly-fed wind power system technology greatly improved the utilization rate of wind power. The design and control of the AC-excited power supply is very important for this kind of system. This paper mainly focus on the control algorithm of double PWM converter which is used in the doubly-fed wind power system.And also the paper deal with engineering design of DFIG system.Firstly, the current research status of wind power generation technology was introduced.The paper analyzed the basic principle of doubly-fed wind power technology. The paper realized the decoupled control of doubly-fed induction generator’s(DFIG’s) active and reactive power based on the mathematical model in rotary two-phase coordinate and also analyzed the principle of maximal wind power capture control. The simulation results under MATLAB/SIMULINK verified the correctness of the control strategy.Secondly, the paper discussed the grid-side PWM converter mathematical mode .In order to stable the double PWM converter’s DC bus voltage and control the grid-side PWM converter’s AC side power factors, the paper have introduced the voltage-current double closed loop control strategy and have been used the MATLAB/SIMULINK to simulate grid-sid PWM converter control algorithm. The results validate the validity of the controlling strategy.Finally, the paper carried out the engineering calculation and designed the system cabinet, main circuit and parts of control circuit.The converter circuit parameters are calculated, include IGBT mode, DC bus’s capacitance selection calculation, breaker parameter calculation, etc. Also, the paper analyzed the basic principle of SVPWM and give out rotor-side PWM converter control procedures and grid-side PWM converter control procedures.