半直驱风电系统最大功率跟踪和变桨距集成控制

摘要

建立了包括风力机、机械传动链、永磁同步发电机和变桨距执行机构在内的半直驱风力发电系统机侧部分数学模型；针对风能随机性及风力机工况切换频繁的特点,给出了实现半直驱风力发电系统优化及可靠运行的集成控制策略.该控制策略以转速控制为基础,以风速滞环判断为条件,实现最大功率跟踪控制和变桨距控制的集成；在MATLAB/Simulink环境下建立了半直驱风力发电系统的仿真模型,仿真结果表明,在渐变风和随机风的作用下,集成控制策略能够实现最大功率跟踪控制和变桨距控制的可靠切换,获得了较为满意的控制效果,验证了该控制策略的正确性和有效性.%The mathematic model of multibrid wind power generation system ( MWPGS) ' s generator - side including wind turbine, mechanical drive train, permanent magnetic synchronous generator and pitch mechanism, was established in this paper. Because of the random wind speed and frequent working state switching in MWPGS,integrated control strategy, which was based on rotation speed control and hysteresis wind variation judgment,and realized the integration of maximum power point tracking (MPPT) and pitch control,was put forward to achieve its optimal and reliable operation. Simulation model of MWPGS was built up in Matlab/Simulink. And simulation results show that the integrated control strategy is able to implement reliable switching between MPPT and pitch control under ramp even random wind speed,and obtain satisfactory control performance. That is to say,it verifies the correctness and feasibility of the control strategy proposed in the paper.