基于矢量偏离度的风电场集电线路故障定位方法

为解决风电场集电线路因短路故障造成的弃风窝电问题,提出了基于矢量偏离度的风电场集电线路故障区间定位方法。该方法根据各终端测量装置的电气量信息,采用综合矢量误差和三相总不平衡度构建了风电场短路故障时的理论计算值与真实测量值的矢量偏离度目标函数。根据偏离度计算结果,判断真实故障时的故障信息与假想故障区间信息的差异程度,最小差异对应的假想故障区间即为真实的故障区间。PSCAD/EMTDC仿真验证了所提方法在不同故障位置、故障区间、过渡电阻情况下的可行性,能够满足风电场对其集电线路故障定位精度的要求。

Fault Location Method of Wind Farm Collection Line Based on Vector Deviation Degree

In order to solve the problem of wind curtailment and poor power transmission ability caused by short-circuit faults in wind farm collection lines, a fault location method for wind farm collection lines based on vector deviation is proposed. According to the electrical information of each terminal measurement device, the objective function of vector deviation between the theoretical calculation value and the real measurement value is constructed by using total vector error(TVE)and total three-phase unbalance. According to the calculation results of deviation degree, the difference between the information of real fault and imaginary fault interval is judged. The imaginary fault interval corresponding to the minimum difference is the real fault interval. PSCAD/EMTDC simulation results show that the proposed method is feasible for different fault locations, different fault intervals and different transition resistances, and can meet the requirements of wind farm for the accuracy of collection line fault location.