直驱风力发电系统设计与仿真

对直驱风力发电系统的风力发电机和网侧变换器的数学模型进行了分析,并在此基础上设计了机侧和网侧控制器。根据风力机功率与风力机转速和转矩的关系,设计了基于最优转矩控制的最大功率点跟踪控制算法。设计了基于Crowbar的低电压穿越方案,采用Buck电路连接,减小了电流冲击。运用Matlab/Simulink软件,搭建了直驱风力发电系统模型,对并网过程,机侧变换器和网侧变换器的控制性能,以及MPPT和LVRT方案进行了验证。

Design and Dynamic Simulation on PMSG Wind Power System

The mathematic models of wind power generator and network-side inverter in PMSG wind power system are analyzed. The generator-side controller and network-side controller are designed based on the analysis. According to the relationship between wind turbine power ＆ rotation rate and torque, the maximum power tracking strategy （MPPT） of Optimized Torque Control is designed. The Low Voltage Ride-through （LVRT） strategy designed based on Crowbar applies Buck circuit to decrease the current shock. The PMSG wind power system simulation model is established in Matlab/Simulink which verifies the process of cutting-in grid, control performance of generator-side controller ＆ network-side controller and the strategies of MPPT ＆ LVRT.