Implementation of sine-wave input/output BLDC inverter for low inductance shipboard PM motor drives using modular power platform

Power density and efficiency of system compatible, sine-wave input/output drives

“…These concerns motivated research into shipboard compatible VFDs with a front-end CSR, or Buck Rectifier, shown in Fig. 3 [10], [13], [3], [2]. The CSR-VSI limits output voltage to <300VAC for a 440VAC input because of cascaded buck converters.…”

“…4/Fig. 5 respectively were developed [13] that could be configured into VSR-VSI and CSR-VSI based VFDs with their associated filter structures as shown in Fig. 6 and Fig.…”

“…This paper presents a comparison between VSI-VSI, CSR-VSI and CSR-CSI based VFDs that meet stringent shipboard power quality and EMC requirements. Previous work by the authors indicated that the CSR-VSI and CSR-CSI require fewer mitigating components than a VSR-VSI equivalent [2], [3], [13]. This paper proposes a method for making a valid comparison of topologies based upon power density, efficiency and cost.…”

“…The VSR and LCL filter make up a significant portion of the VFD size. An alternative to the VSR is the voltage bucking 'active' Current Source Rectifier (CSR) which has the potential creating DC output with sinusoidal input current with reduced input filtering but with lower dc link voltage and hence lower VSI output [3], [8]- [13]. The CSC equivalent to a VSR-fed VSI (or VSR-VSI) is a CSR front end to a voltage boosting Current Source Inverter (CSI) to synthesize AC output.…”

Rectifier efficiency analysis for DC distributed data centers

“…The buck-type CSR topology not only reduces the number of converting stages, but also decreases the losses and improves the converter efficiency due to lower number of active and passive elements. Furthermore, the CSR is capable of forming the input current to improve power factor and can handle the input current in case of an output short circuit [1,2,3].…”