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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.

Research on the calculated model of Protective Relaying of considering wind power connected to the grid