摘要
针对电网电压对称跌落时永磁直驱风电系统低电压穿越能力的问题,在网侧控制中提出使用电机侧与电网侧的功率差信号来稳定直流侧电压,并且根据电压跌落深度控制无功和有功功率的输出大小,构成功率外环与电流内环双环控制系统。仿真结果表明,在电网电压跌落20%以内且持续时间不大于0.2 s时,该控制策略保证了直流侧电压稳定,有助于提高无功功率注入电网及恢复电网电压。
To improve the capability of low voltage ride-through of direct-driven wind turbine with permanent magnet synchronous generator （D-PMSG）, the signal of grid side and generator side power difference was applied to outer loop to keep DC voltage stable and based on the degree that voltage dipped to export reactive power and active power. The simulation results show that the method can improve the D-PMSG wind power system low voltage through capability, limit the DC voltage and increase reactive power output when the grid side voltage dips within the 20%.
出处
《电源技术》
CAS
CSCD
北大核心
2012年第12期1883-1886,共4页
Chinese Journal of Power Sources
基金
甘肃省科技厅科技支甘项目(1011JKCA172)
兰州市科技计划项目(2011-1-106)
关键词
永磁直驱同步风力发电机组
低电压穿越
功率外环
电流内环
无功补偿
direct-driven wind turbine with permanent magnet synchronous generator （D-PMSG）
low voltage ride-through（LVRT）
power outer loop
current inner loop
reactive compensation
