计及风电接入电网后继电保护计算模型的研究

Research on the Calculated Model of Protective Relaying of Considering Wind Power Connected to the Grid

摘要: 随着大规模风场的接入，在电力系统计算的过程中，必须要考虑风场的接入对电力系统的影响。本文首先分析了单个风机模型，分析了Crowbar电阻是否接入、风场实际运行的风机数量，得出单个风机的大小方式两种正负序阻抗；然后根据现场接线方式，考虑箱变接入的影响，将风机和箱变串联等效成一个风机箱变组；最后通过实际参数计算出风场的等效阻抗，并通过故障计算中验证结果的正确性。

Abstract: Due to large-scale wind farms connected to the grid, the grid computing needs to consider the impact of wind farm when integrated into the power grid. Firstly, the single turbine model is analyzed; the positive and negative sequence impedance of a single turbine in the large and small operating modes are got by analyzing whether Crowbar resistance is accessed and the number of wind turbines put in actual operation. Then, according to the wiring way of wind farm and the influence of transformer accessed, wind turbine and transformer will be equivalent to wind Chassis variant Group. Finally, according to the actual parameter calculation of wind farm we get the equivalent impedance, and use the results verify the correctness of fault calculation.