Abstract:

As the backup power supply of transformer substation DC system,the regular activation is an effective means to detect the capacity of the battery pack and find out the backward battery.In view of the fact that the traditional battery activation device consumes the energy released by the battery through the resistance,which has energy waste and potential fire hazards,a set of energy feedback activation system of the transformer substation battery pack is designed.The system includes the DC/AC grid connected converter,DC/DC converter,the monitoring and battery detection device,which can realize the energy feedback of the battery pack to the power grid and the AC side high power factor.The working principle is analyzed,and finally the function of the experimental prototype is verified.

Key words: battery activation, DC/AC grid connected converter, DC/DC converter, energy feedback