摘要
在DIgSILENT/PowerFactory仿真软件中建立了双馈感应发电机(Double fed induction generator,DFIG)和实际电力系统模型,验证了不同短路点对风电场低电压穿越(low voltage ride through,LVRT)功能的的影响。仿真结果表明:当电网侧发生严重故障时,双馈电机转子侧变频器由于转子绕组过电流而被crow-bar保护短接闭锁,此时双馈风电机组将失去控制用功、无功的能力,风电场的暂态电压稳定能力将影响到电网的安全稳定,短路点与DFIG的电气距离越远,DFIG的LVRT效果越好,即短路点与DFIG的电气距离越远时,DFIG的LVRT相对而言更容易实现,电网的LVRT相对而言更难实现。
The double fed induction generator model and actual electrical power system grid are established in the simulated program DIgSILENT/PowerFactory,the influence of different short-circuit point on the LVRT(Low Voltage Ride Though) of the wind farm is studied.The simulation results show that when connected to the grid and during a grid fault,the Rotor Side Converter(RSC) of DFIG may be blocked to protect it from overcurrent in the rotor circuit,for the time being,the DFIG loses the ability to control active and reactive,then transient voltage stability of wind farm will influence the security and stability of grid.The longer electrical distance from the short-circuit point to the wind farm,the more difficult for LVRT on wind farm to realize.
出处
《四川水力发电》
2011年第A02期216-218,222,共4页
Sichuan Hydropower
