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Cuzner R.,University of Wisconsin - Milwaukee | Drews D.,DRS Power and Control Technologies | Venkataramanan G.,University of Wisconsin - Madison
IEEE Transactions on Industry Applications | Year: 2015

The benefits of variable-frequency drives (VFDs) have not been fully realized in many applications because they compete in the power density of legacy equipment, such as electromechanical motor controllers. This is particularly the case in Navy shipboard systems where sensitive equipment is in close proximity to VFDs. This paper compares the power densities, efficiency, and costs of both voltage-source- and current-source-based VFDs. A meaningful comparison is made based on actual hardware implementations that meet stringent power quality and electromagnetic compatibility requirements. The hardware results of a current-source-rectifier (CSR)-fed voltage-source inverter (VSI), or a CSR-VSI-based VFD, are provided in order to support the findings of this paper. Special consideration is given to operation at light loads. © 1972-2012 IEEE. Source


Rose M.W.,DRS Power and Control Technologies | Cuzner R.M.,University of Wisconsin - Milwaukee
2015 IEEE Electric Ship Technologies Symposium, ESTS 2015 | Year: 2015

This paper provides experimental verification of a fault isolation sequence in a DC Zonal Electrical System. Three electrical zones consisting of phase controlled rectifier interfaces to medium voltage AC distribution, two DC distribution buses and downstream converters, inverters feeding loads are energized and bolted faults are applied to various locations. The Fault Isolation and Reconfiguration approach utilizes no load switches for fault isolation aided by de-energization of the affected buses. Three electromechanical no load switches in a single assembly are utilized at the interface between electrical zones. The instantaneous peak fault currents were captured at each switch and sent to adjacent modules over a Ethernet-based Local Area Network in order to locate and isolate the fault to the nearest bus segment. Experimental results show that in most cases full output capacity was restored autonomously. Loss of communications scenarios are tested showing limited power restoration. © 2015 IEEE. Source


Cuzner R.M.,DRS Power and Control Technologies | Venkataramanan G.,University of Wisconsin - Madison
2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013 | Year: 2013

While operation of the three phase Current Source Rectifier (CSR) for ac-to-dc conversion using phase control or low frequency pulse control is well established in a wide variety of applications, CSR realization using high frequency Pulse-Width-Modulation (PWM) control is being studied recently as a potentially competitive alternative to a Voltage Source Rectifier (VSR). In the CSR reverse blocking gate turn-off switches are realized using series connected diodes, which prevent any reversal of the dc link current. A significant consequence of this limitation occurs at light load conditions. The dc link inductor current enters discontinuous mode of operation and leads to loss of control of output voltage and highly distorted input current, which compromises the potential advantages of the approach. This paper characterizes the CSR while operating in discontinuous conduction mode and proposes a modulation strategy which restores control of output voltage and ensures nearly sinusoidal current at light loads. Simulation and hardware results are provided for a 3kW laboratory scale prototype system. © 2013 IEEE. Source


Cuzner R.,DRS Power and Control Technologies | Drews D.,DRS Power and Control Technologies | Kranz W.,Trans Coil International | Bendre A.,Trans Coil International | Venkataramanan G.,University of Wisconsin - Madison
IEEE Transactions on Industry Applications | Year: 2012

A variable-frequency drive (VFD) having a 440-V front-end current source rectifier (CSR) interface to a voltage source inverter (VSI) feeding a Permanent-Magnet Axial-flux Air Core motor combination is a solution for low-horsepower pump and fan control that is both power dense and compatible with a shipboard environment. This paper describes the control and power platforms for the CSR/VSI and provides experimental results for a 250-V 3.3-kW system. Power density and efficiency comparisons are made between equivalent CSR/VSI-and voltage-source-conversion-based VFDs to demonstrate that the CSR/VSI-based VFD is more power dense. © 1972-2012 IEEE. Source


Drews D.,DRS Power and Control Technologies | Cuzner R.,DRS Power and Control Technologies | Venkataramanan G.,University of Wisconsin - Madison
2014 IEEE Energy Conversion Congress and Exposition, ECCE 2014 | Year: 2014

This paper identifies the characteristics of a Current Source Inverter (CSI) operating in discontinuous conduction mode (DCM) and proposes a new multi-objective Pulse-Width Modulation (PWM) method to mitigate voltage boosting and harmonic distortion effects. The method takes into account load impedance effects. The concept is verified experimentally on a 3kW test bed. © 2014 IEEE. Source

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