直驱永磁风力发电系统并网特性研究

Research on the Grid-connected Operation Characteristics for Direct Drive Permanent Magnet Wind Power Generation

随着大规模风电机组的并网运行,风电机组或电网故障导致风机脱网的情况时有发生,这主要是由于对风电系统的并网运行特性没有深入的研究,而针对电网故障情况下的运行特性研究则更加薄弱。对使用背靠背全功率变流器的直驱永磁风电系统的综合控制策略进行了研究,并针对风速变化以及不同电网电压跌落情况下的响应情况进行分析。根据仿真结果可以看出,机组有着较好的动态响应,在风速大范围连续波动状态下有相对稳定的输出,且在系统发生故障后亦能够较快地恢复稳定,从而实现低电压穿越,保证风机的稳定并网运行。

With the large-scale wind turbines connected to the grid,the fault from wind turbine or the grid will result in the turbine off-grid.This is mainly due to not further study of grid-connected operation characteristics for wind power systems,while the study of operating characteristics in the case of grid failure is even weaker.The basic control strategies of direct drive permanent magnet wind power system using back to back full power converter are studied,and its response in case of variable wind speed and different power grid voltage drops are analyzed.The simulation results indicate that the turbine has a good dynamic response,and the output is relatively stable with large range continuous fluctuation of wind speed,in addition that the system restores stability quickly after clearing the fault,which achieves low voltage ride through and ensures stable network operation of the turbine.