对称电压跌落条件下双馈风电机群馈出电流与线路电流保护的交互影响

发布时间：2019-02-25 07:56

【摘要】：随着风电机组低电压穿越能力的加强和风电场规模的扩大,风机提供的短路电流变得不可忽视,对现有的风电场保护配置形成了挑战。首先介绍了大量含有双馈异步风电机组的酒泉风电场结构及保护配置,理论推导并仿真研究了单一风机对称电压跌落条件下定子电流的时频域特征,进而针对保护能够感受到的工频交流分量,研究不同风机侧及网侧参数条件下的风电集群馈出电流与集电线路电流保护的交互影响,并指出保护可能存在的误动风险。研究结果表明,中压集电线路故障可能引发邻近线路电流保护的误动,而合理的Crowbar电阻阻值及风电场资源配置可降低其误动风险。加装方向元件可在上述参数无法形成有效配合时避免电流保护误动,从而能够增强风电场的故障穿越能力。
[Abstract]:With the enhancement of low voltage traversing ability of wind turbine and the expansion of wind farm scale, the short-circuit current provided by wind turbine can not be ignored, which poses a challenge to the existing wind farm protection configuration. Firstly, the structure and protection configuration of Jiuquan wind farm with doubly-fed asynchronous wind turbine are introduced, and the time-frequency characteristics of stator current under the condition of symmetrical voltage drop of single fan are theoretically deduced and simulated. According to the AC component of power frequency which can be felt by the protection, the interaction between the feedback current of the wind power cluster and the current protection of the collector line under different parameters of the fan side and the grid side is studied, and the possible misoperation risk of the protection is pointed out. The results show that the fault of the middle voltage collector line may cause the misoperation of the current protection of the adjacent lines, and reasonable Crowbar resistance and the allocation of wind farm resources can reduce the misoperation risk. Adding directional elements can avoid the misoperation of current protection when the above parameters can not be effectively matched, thus enhancing the fault traversing ability of wind farm.
【作者单位】：强电磁工程与新技术国家重点实验室(华中科技大学);
【基金】：国家重点基础研究发展计划项目(973项目)(2012CB215100) 国家自然科学基金项目(51207064)~~
【分类号】：TM614;TM773

【相似文献】