防止风电机组连锁脱网事故的动态无功备用需求分析  

The analysis of dynamic reactive power reserve command to prevent cascading trip-off of wind turbine generators

作　　者：李亚龙[1] 但扬清[2] 朱艳伟[3] 刘文颖[1] 蔡万通 Li Yalong Dan Yangqing Zhu Yanwei Liu Wenying Cai Wantong(School of Electrical ＆ Electronic Engineering, North China Electric Power University, Beijing 102206, China State Grid Zhejiang Electric Power Company Economic Research Institute, Hangzhou 310007, China State Grid Zhejiang Electric Power Company Ningbo Power Supply Company, Ningbo 315010, China)

机构地区：[1]华北电力大学电气与电子工程学院,北京102206 [2]国网浙江省电力公司经济技术研究院,浙江杭州310007 [3]国网浙江省电力公司宁波供电公司,浙江宁波315010

出　　处：《可再生能源》2016年第12期1792-1798,共7页Renewable Energy Resources

基　　金：国家科技支撑计划项目(2015BAA01B04);国家电网公司重大项目(52272214002C);中央高校基本科研业务费专项资金(JB2015121)

摘　　要：对风电机组连锁脱网事故的调查表明,双馈风电机组触发Crowbar保护进入低电压穿越区需要从电网吸取大量的无功,造成风电场电压进一步恶化。文章对大型风电场的无功需求和运行状况进行深入分析,推导出大型风电场的临界运行电压和无功备用容量计算公式,为风电场无功电压协调控制提供理论支撑。采用酒泉风电基地的实际算例进行了仿真分析,结果表明,风电场机组处于鼠笼异步运行状态时需要从电网吸收大量无功,同时风电场周边场站电压下降明显;而当动态无功备用容量达到临界动态无功备用容量及以上时,则能有效地改善风电场相关站点的电压分布。According to the investigation on the cascading trip-off of wind turbine generators, the main reason is that wind turbine generators do not possess the capacity of low voltage ride-through. In other words, upgrading the wind turbine generators＂ capacity of low voltage ride-through can effectively prevent the cascading trip-off failures. However, when the power system goes failure, doubly Fed Induction Generator will get into the low voltage ride-through area because crowbar protection is triggered. The doubly fed Induction generators need to absorb a large amount of reactive power from the grid. If this fault can＇t be removed and recovered promptly, the voltage of the substations around the wind farm will deteriorate further, which is still likely to trigger large scale cascading trip-off-grid failures. The reactive power demand and the operation conditions of the large wind farm is analyzed deeply in this paper, and the critical operating voltage and reactive power reserve capacity is given for large wind farms. It provides theoretical support for coordinated control of reactive voltage of wind farms. Jiuquan wind power base was adopted as a practical example to do simulation analysis, the results show that the wind farm turbines in squirrel cage asynchronous operation state need to absorb a large amount of reactive power from the grid, and the voltage of the substations around the wind farm decreases significantly in the meantime; when the dynamic reactive power reserve capacity reaches the critical dynamic reactive power reserve capacity or above, the voltage distribution of the substations related to the wind farm can be effectively improved.

关 键 词：风电机组连锁脱网 Crowbar保护 风电场动态无功备用容量 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程]