Abstract:

A new type of single-phase high power factor charging and discharging equipment for accumulator is presented. The equipment is comprised of two parts, i.e., single-phase PWM rectifier and bidirectional DC/DC converter. The single phase PWM Rectifier is controlled on the basis of d-q reference frame, and it is combined with PLL so that the charging and discharging equipment can achieve sinusoidal current at the network side and unit power factor charging and discharging. The bi-directional DC/DC converter can not only achieve bidirectional flow of energy in the equipment, but can also charge the accumulator at a constant current and a constant voltage, and discharge it at a constant current. Experimental results verifies the effectiveness of the equipment.

Key words: accumulator; rectifier; DC/DC; charging and discharging equipment