毕业设计直趋式永磁同步风力发电系统的控制研究.docVIP

摘要 风能作为可再生、洁净无污染、取之不尽用之不竭的能源，成为世界可再生能源发展的重要方向。永磁直驱风力发电机机械损耗小、运行效率高、维护成本低等优点而成为研究的。本文主要研究两方面，一是直驱风力发电系统的模拟仿真，二是最大功率跟踪方法。 Abstract Wind as a renewable, clean non-polluting, inexhaustible energy, become an important direction of the worlds renewable energy development. Permanent magnet direct drive wind turbines due to mechanical loss is small, efficient operation, low cost for maintenance have become the focus of research models. This paper studies two aspects, one is direct-drive wind power system simulation, the other is the maximum power point tracking. Comparative advantages and disadvantages of the common topology. The paper has done full-scale study on the direct-dirve variable-speed constant-frequency wind power generation from theory to simulation.The author has done thoroughly description on the characteristic of the direct-drive wind power generation and based on the existent Maximum Power Point Tracking Algorithm,established the topology configuration of Permanent Synchronous Generator,three-phase uncontrolled Rectifier,DC-DC boost circuit, full-bridge Inverter circuit.A new Maximum Power Point Tracking Algorithm and speed-estimated control was put forward to increase the response of the systemBy a dc circuit can boost energy-storage big inductance, and make the hair generator power output, and reduce the system stable torque ripple. A three-phase permanent synchronous generators, through rectifier bridge rectifier voltage and pulse smaller after rectifying dc voltage, particularly suitable for large inductance filter, electromagnetic torque ripple, low noise, small vibration system. The motor can be directly coupled with wind speed, suitable for large wind power system. Three-phase controlled rectifying has high reliability, simplified the hardware circuit, Dc transformation can be after rectifying circuit dc voltage inverter needed to basic constant amplitude, the dc voltage grid inverter after inverter. The power of tracking algorithm proposed can make