永磁直驱风电机组低电压穿越技术的研究

随着风电机组安装容量的不断上升,风电系统在电网故障情况下的运行变得尤为重要,一些电网导则要求风电机组在电网电压跌落时要保证在一定范围内不脱网运行.针对使用背靠背的永磁直驱风电系统,分析了双PWM控制器的网侧控制策略,并设计直流侧卸荷电阻式Crowbar电路的硬件电路和控制策略,与网侧控制配合并进行了仿真分析.结果表明直...

Low Voltage Ride Through Technology Applied to Permanent Magnet Direct-driving Wind Generator Units

With the installed capacity rising of wind turbine generators,wind power system operation in the case of power failure has become particularly important.Some grid-connection standards require the wind turbine to ensure no off-grid operation within a certain range when the grid voltage drops.Aiming at back-to-back direct-drive wind power system,net side control strategy of double PWM controller was analyzed.And unloading DC resistive crowbar circuit hardware circuit and control strategy were designed.The results showed that DC resistance unloading is simple,reliable and has greatly enhanced the fan’s low-voltage ride through capability.