Reactive dynamic compensating device for tracting power supply system

The utility model discloses a low voltage reactive dynamic compensating device used for a tractive power supply system of an electrified railway The utility model is formed by that a filter bank turned at a designated harmonic wave is connected with a low voltage winding of a coordination transformer (Tn), and the coordination transformers are coupled with the tractive power network. A plurality of transformers which can be turned to different harmonic waves are connected with a filter in parallel. The switch is thyristor valve which is composed of low voltage thyristors. The utility model has the scheme that the use of expensive high voltage thyristors which are difficult to operate and maintain is avoided, and the voltage regulating, power factor compensating, filtering, balancing, etc. requirements for reaching the high quality of a power network can be met.