Enhancement of Power Quality and Energy Storage Using A Three – Terminal Ultra Capacitor and CCM Converter for Regenerative controlled Electric Drives

Most of modern controlled electric drive applications, such as lifts, cranes, and tooling machines, are characterized by a high ratio of the peak to average power. In addition, such applications have high demand for braking at the full rated power. In ordinary drives, the braking energy, which represents 30%–50% of the consumed energy, is dissipated on a brake resistor. Apart from this ―energetic‖ issue, power supply interruption and the input current quality are two additional issues to be solved. The ultra capacitor with an interface of soft-switched continuous conductionmode (CCM) boost converter suitable for high-power applications such as power factor correction, hybrid electric vehicles, and fuel cell power conversion systems is presented in this paper. Continuous Conduction Mode dc–dc converter is used to store and recover the braking energy. In addition, the dc–dc converter controls the rectifier current and reduces the drive input current total-harmonicdistortion factor down to 30%. Moreover, the dc bus voltage is boosted and controlled to be constant and ripple free regardless of the load The proposed converter achieves zero-voltage-switched (ZVS) turn-on of active switches in CCM and zero-current-switched turn-off of diodes leading to negligible reverse-recovery loss. The presented solution is theoretically analyzed and experimentally verified. Keywords— CCM,Ultra capacitor, Soft Switching,electric drives, THD, Loss Free Transformer(LFT)