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Traction substation as a place to provide electric power for electric locomotive, stability and security of power system. Because the electric locomotive is a nonlinear load high speed carrier has unbalanced characteristics, the fundamental current in the absorption grid is also fed back to the harmonic current, The disturbance and filter distortion are brought to the power grid, threat to power supply line and load safety. Based on the comparison of three-phase matching and mismatch model, multi-sensor data acquisition and measurement data fusion technology and adaptive model correction function, change of control parameters and adjustment of structural state, find out the scheme that can control and optimize the error, ensure the safety and stability of power supply.