DRS Power and Control Technologies

Milwaukee, WI, United States

DRS Power and Control Technologies

Milwaukee, WI, United States
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Fleming F.E.,DRS Power and Control Technologies | Edrington C.S.,Florida State University
IEEE Transactions on Industrial Electronics | Year: 2016

This work proposes to develop a novel real-time (RT) magnetic equivalent-circuit machine model, for providing accurate electromagnetic (EM) device characteristics in a time frame acceptable for RT applications. Utilizing this model with the Hardware-in-the-Loop (HIL) concept enables a wide variety of useful applications. HIL concept requires accurate, RT models to emulate the characteristics of the modeled system, thus the proposed method provides a larger range of observable dynamics for large-scale simulations, controller tests, or hardware emulations. The proposed model is implemented for a switched reluctance machine (SRM) on a field-programmable gate array (FPGA). Finite-element analysis (FEA), lumped parameter modeling, and an experimental test bed serve to benchmark the modeling accuracy and RT applicability under static, dynamic, and controlled test conditions. © 1982-2012 IEEE.


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.


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.


Chawla R.S.,DRS Power and Control Technologies | Stanford T.L.,DRS Power and Control Technologies | Wrate S.A.,DRS Power and Control Technologies
2011 IEEE Electric Ship Technologies Symposium, ESTS 2011 | Year: 2011

The Navy Electronic Motor Operator, a next generation shipboard control product is discussed. The product's modularity, network capability, programming flexibility is highlighted. Key testing data from qualified products list (QPL) testing is included. Some of the product applications are expanded upon herein. © 2011 IEEE.


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.


Cuzner R.,DRS Power and Control Technologies | Drews D.,DRS Power and Control Technologies | Venkataramanan G.,University of Wisconsin - Madison
2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012 | Year: 2012

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 electro-mechanical motor controllers. This is especially the case in Navy shipboard systems where sensitive equipment is in close proximity to VFDs. In this context, this paper compares the power densities, efficiencies and costs of a Voltage Source Converter (VSC), Current Source Converter (CSC) and mixed VSC/CSC based VFDs. A meaningful comparison is made based upon an actual hardware implementation that meets stringent power quality and electromagnetic compatibility (EMC) requirements. Hardware results of a CSC/VSC based VFD are provided in order to support the findings of the study. Special consideration is given to operation at light loads. © 2012 IEEE.


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.


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.


Cuzner R.M.,DRS Power and Control Technologies | Bendre A.R.,DRS Power and Control Technologies | Widmann J.D.,DRS Power and Control Technologies | Stonger K.A.,DRS Power and Control Technologies | And 3 more authors.
2011 IEEE Electric Ship Technologies Symposium, ESTS 2011 | Year: 2011

Power continuity is maintained to critical loads in shipboard DC distribution systems by diode auctioneering the outputs of DC/DC power converters fed from separate main DC buses. In order to minimize the size/weight of power conversion non-isolated three-level buck converters are used to convert voltage from a higher main bus voltage level (typically 1000VDC) to lower ship load DC voltages (i.e. 650VDC, 850VDC, etc.). Two buses of the same voltage level are paralleled without issue. However if more than one buck converter or group of paralleled buck converters are used to create more than one voltage feed that is paralleled with similar converters connected to the opposite main bus through auctioneering diodes then paths for circulating currents may be created during the unsynchronized commutation states of opposite bus power semiconductors. In addition, the auctioneering of two or more buses presents particular challenges to maintaining power continuity throughout the ship when more than one ground fault is applied. This paper documents the lessons learned based on simulation and tests on a 3MW system and identifies measures that can be taken to ensure robust operation during normal modes of operation and survive multiple ground fault scenarios. © 2011 IEEE.


Kranz W.R.,DRS Power and Control Technologies | Cuzner R.M.,DRS Power and Control Technologies | Drews D.J.,DRS Power and Control Technologies | Bendre A.R.,DRS Power and Control Technologies | Venkataramenan G.,University of Wisconsin - Madison
2011 IEEE Electric Ship Technologies Symposium, ESTS 2011 | Year: 2011

A 15kW Brushless DC (BLDC) motor drive system suitable shipboard applications has been developed. This platform meets shipboard interface requirements with low cost and high power density. It consists of a Pulse-Width Modulated (PWM) Current Source Rectifier (PWM-CSR) and front end Voltage Source Inverter (VSI) modules feeding a high efficiency PM Motor. Converter modules can be interchanged in order to optimize the power conversion function to the application. The design also includes controls networkability and flexibility to enable automation and end-user customization. This paper also investigates the optimal configuration in order to meet performance objectives without increasing size/weight. Experimental results are provided. © 2011 IEEE.

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