永磁同步风力发电系统最大功率追踪新方法

Research on New Method for Maximum Power Point Tracking of Permanent Magnet Synchronous Wind Power Generation System

风力发电系统的输出功率随着风速变化而变化，引起输出功率的波动。因此提出一种采用永磁同步电机作为发电机实现最大功率输出的永磁同步风力发电控制系统。建立了风力机模型、最大功率追踪算法模型，采用二分法和停止机制算法，使风机按最大功率点跟踪方式运行，通过二分法实现变步长，并加入停止机制降低转速振荡，防止在最大功率点的波动。介绍了传统爬山法和改进的爬山法，通过对比仿真研究，表明新方法可以有效提高最大功率追踪效率，并减少系统在最大功率点的波动。

Output power of wind power generation system varies with random wind,and may lead tracking power to appear oscillation.So it is necessary to track the maximum power point tracking （MPPT） of wind power generation system.Wind turbine model and MPPT algorithm model were established.A new power tracking algorithm was proposed to improve the performance under variable conditions according to the method of bisection and stop mechanism.Varied step length was achieved by the bisection method,and wave on the maximum power point was improved by the stop mechanism.The traditional hill-climbing method and the improved hill-climbing method introduced.Simulation showed that proposed algorithm can achieve MPPT fast,and can improve the efficiency of wind power capture.