双馈风电机组低电压穿越能力的提高  

Improved Low Voltage Ride Through Capability of Doubly-fed Wind Generator

作　　者：李鸿儒[1] 金炜东[1] 胡立锦[2] 

机构地区：[1]西南交通大学电气工程学院,成都610031 [2]新疆大学电气工程学院,乌鲁木齐830047

出　　处：《电力系统及其自动化学报》2013年第5期7-12,共6页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金(60971103);中央高校基本科研业务费专项资金;智能电网关键技术

摘　　要：采用Crowbar保护会使电网故障时无功不足的情况更加严重,影响电压恢复,而且故障时,变流器直流侧母线会产生过电压,尤其是故障发生点接近风电场时,转子转速会出现较大的振荡。在DIgSILENT中建立了双馈风力发电系统模型,仿真分析了通过Crowbar保护电路投入使网侧变流器以STATCOM模式运行,并额外增加动态无功补偿设备、电网发生故障时增加直流侧耗能电路和附加转速稳定器这3种策略来有针对性地解决上述问题,提高双馈风电机组的低电压穿越能力。Using the crowbar protection makes the shortage of reactive power more serious when fault happens in the power grid, which impacts on the voltage recovery rate. Also, the fault will result in over-voltage in DC bus of convert- er. Especially in the case of the fault location closing to wind farm, the rotor speed will show larger oscillation. A dy- namic model of doubly-fed wind power generation system is established in DIgSILENT. The simulation of making the grid side converter operate in STATCOM mode after the crowbar protection circuit is put into operation and increasing dynamic reactive compensation equipment are analyzed. Results show that increasing DC-link chopper and additional speed stabilizer when power grid fault happens can solve above three problems and improve the low voltage ride through （LVRT） capability of doubly-fed induction generator （DFIG）.

关 键 词：双馈风力发电机 低电压穿越 静止同步补偿器 直流侧耗能电路 附加转速稳定器 

分 类 号：TM614[电气工程—电力系统及自动化]