In order to further suppress the over-voltage of the high-frequency pulse wave of the permanent magnet wind turbine converter and the transmission of the long cable, and reduce the bearing current of the motor, a new type of RLC-plus-C passive is proposed based on the common mode current attenuation method. Filter and its design method. Firstly, the equivalent circuit model of long cable transmission is established, the overvoltage generation mechanism is analyzed, the transfer function is introduced, and the filter parameters are optimized. Secondly, the parameters Rf, Cc and Cf of the new filter are designed. On this basis, a complete calculation method is designed in Matlab for the value of the inductance Lf. Finally, the simulation model of PWM converter-long cable-generator is built by Matlab/simulink software, and a new filter is introduced to analyze its overvoltage suppression effect, bearing current attenuation and power loss, and RLC and RL-C filters. Comparison. The results show that the RLC-plus-C filter further suppresses the overvoltage of the terminal and significantly reduces the bearing current.
