Research on Train Grid Low-frequency Oscillation Based on AC-DC-AC Drive Mode

If the low-frequency and large-scale oscillation strikketøy oppbevaring of the traction grid voltage continues, the grid voltage protection of locomotive or EMU traction system will be influenced, resulting in converter traction blocking and affecting the normal operation of the train.In view of this practical engineering problem, the main influencing factors of apac1/60/1/cw train network oscillation were analyzed with impedance ratio criterion and Bode diagram, and verified according to computer simulation.Without adding any hardware circuit,the method of suppressing low-frequency oscillation of pantograph catenary by optimizing control parameters was proposed.The feasibility of the method was verified by hardware in the loop simulation.