摘要
为了提高永磁直驱同步风电机组(PMSG)并入电网的运行稳定性,研究了3种低电压穿越技术,提出了结合增大网侧输出有功、投切Crowbar电路和调节电磁转矩的控制方案。同时设计了风电机组新的机侧变流器和网侧变流器的低电压穿越控制策略,利用能量平衡原理对故障后转速表达式进行了推导。在Matlab/Simulink平台电压跌落情况下对直驱风电机组进行一系列的仿真,仿真结果与理论分析一致,验证了该控制方案能优化系统低电压穿越的性能。
To improve the stability of power grid with permanent magnet direct-driven wind turbines, three LVRT control techniques of permanent magnet direct-drive wind generation system were investigated, proposed a control strategy which included increasing grid-side power output, using crowbar circuits and regulating electromagnetic torque. The LVRT control strategy of grid-side converter and generator-side converter was designed. According to power flow balance principle, the expression of generator speed when fault is cleared was deduced. The simulation of PMSG was carried out by Matlab/Simulink platform under voltage drop. The simulation results are consistent with theoretical analysis, which demonstrate the strategy can obtain better LVRT performance.
出处
《电气传动》
北大核心
2015年第6期41-45,72,共6页
Electric Drive
关键词
直驱永磁同步风电机组
低电压穿越
CROWBAR电路
控制策略
能量平衡
direct-driven permanent magnet synchronous generator （PMSG） wind turbines
low voltage ridethrough
crowbar circuits
control strategy
power flow balance
