James Cale

James Cale
Colorado State University | CSU

Doctor of Philosophy

About

27
Publications
2,386
Reads
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389
Citations

Publications

Publications (27)
Article
Full-text available
The aerospace industry is increasingly transitioning from hydraulic and pneumatic drives to power-electronic based drive systems for reduced weight and maintenance. Electromechanical thrust reverse actuation systems (EM-TRAS) are currently being considered as a replacement for mechanical based TRAS for future aircraft. An EM-TRAS consists of one or...
Article
Mobile microgrid generator systems can provide power to electrical loads during grid outages and for off-grid applications. These systems are often configured using conventional generator sets, but can also be used with parallel energy storage. The addition of energy storage may provide advantages in terms of power quality and emissions. This paper...
Article
Full-text available
This paper describes an experimental and numerical optimization procedure for off-line extraction of parameters for unsymmetrical, single-phase induction machines with capacitorstart operation. In addition to permitting asymmetry between phase winding parameters, the approach requires only average and rms measurements as inputs; electrical phase an...
Conference Paper
Full-text available
This paper introduces an approach for pre-screening manufactured batteries before system deployment, with the goal of reducing higher lifecycle maintenance costs attributed to failure-prone batteries. The method employs a pattern recognition algorithm for classifying parts for acceptance or rejection. The paper describes the classification algorith...
Article
Full-text available
This paper describes a detailed nonlinear electromagnetic model for predicting current in transformers commonly used to supply electrical power in rural arc welding applications. Current-limiting in these welders during quenched arcs is achieved using a gap-less core design, resulting in high magnetizing impedance but also a significant degree of m...
Conference Paper
Full-text available
This paper describes a method for assessing dynamic reliability of electromechanical actuator systems using limited external sensor measurements, with the overall goal of providing optimized maintenance scheduling for a fleet of deployed systems. To account for special cause failures in the actuators, nominal reliability is adjusted using an accumu...
Article
This paper introduces a potential approach for mitigating the effects of communication delays between multiple, closed-loop hardware-in-the-loop experiments which are virtually connected, yet physically separated. The method consists of an analytical method for the compensation of communication delays, along with the supporting computational and co...
Conference Paper
Full-text available
In this paper, a method for estimating power injected into an electrical distribution system from spatially distributed residential PV systems using data from ground-based weather stations is described. This method was developed as part of the High Penetration PV Deployment Project at the Arizona Public Service (APS). Verification of this predictiv...
Conference Paper
Full-text available
This paper describes a methodology and approach used to perform clustering on distribution feeders within the service territory of Arizona Public Service (APS). This clustering process was performed in order for APS to characterize the types of feeders in their service territory and to provide a method of feeder classification to inform PV intercon...
Patent
Methods and apparatus for characterizing magnetic properties of materials, such as a material's anhysteretic B-H characteristic or its permeability as a function of B or H. A test apparatus for determining these magnetic properties is constructed to yield a symmetrical field distribution through material being tested to avoid localized saturation w...
Article
A control scheme is proposed for an islanded low-inertia three-phase inverter-based microgrid with a high penetration of photovoltaic (PV) generation resources. The output of each inverter is programmed to emulate the dynamics of a nonlinear oscillator. The virtual oscillators within each controller are implicitly coupled through the physical elect...
Conference Paper
In an effort to better understand the impacts of high penetrations of photovoltaic (PV) generators on distribution systems, Arizona Public Service and its partners are implementing a multi-year project to develop the tools and knowledgebase needed to safely and reliably integrate high penetrations of utility- and residential-scale PV. Building upon...
Article
The effectiveness of maximum power point trackers (MPPTs) is an important factor in the energy harvest economics of a PV system. Inverter manufacturers want to maximize the effectiveness of their MPPTs, and plant developers desire to choose inverters with the highest energy harvest to maximize their return on investment. However, comparing MPPTs ag...
Article
In this paper, we set forth a procedure to perform detailed inductor designs using population-based optimization methods. We chose inductor designs on the basis of design inputs, i.e., the inductor geometry and core material. The method incorporates recent research in magnetic materials characterization, advanced inductor modeling, and hysteresis l...
Article
We present a new field-extrema hysteresis loss model (FHM) for high-frequency ferrimagnetic materials, along with a parameter identification procedure. The model does not involve solving an ordinary differential equation (ODE) and is asymmetric in that it works well under dc bias conditions. In the proposed model, the loss calculations are based on...
Conference Paper
Evolutionary design refers to the use of evolutionary computing methods in the design process. Normally, this entails the formulization of the design problem as an optimization problem, which is solved using evolutionary techniques such as a genetic algorithm or particle swarm optimization. This paper provides three examples in the use of this high...
Conference Paper
In this paper a procedure is set forth to perform detailed inductor designs using population-based optimization methods. The inductor designs are chosen based on design inputs¿i.e., the inductor geometry and core material. The method incorporates recent research in magnetic characterization and advanced inductor modeling. Several case studies are...
Article
In this paper, we propose an improved method of characterizing highly permeable magnetic materials. The method is experimentally simple, inexpensive, and more accurate than that in IEEE Standard 393-1991. Our method places special emphasis on determining magnetic characteristics during saturated conditions.
Article
We present a high-fidelity magnetic equivalent circuit (HFMEC) inductor model that reduces the inaccuracies associated with a traditional MEC approach. The model can accurately predict the flux linkage versus current characteristic in a fraction of the time needed for finite-element analysis. The accuracy, computational efficiency, and simple input...
Conference Paper
Permanent magnet synchronous machines can be designed to obtain high efficiency and high torque density. Recently, there has been intense interest in the use of genetic algorithms (GAs) to design either part or all of the machine. In this work a highly structured approach to PMSM design which encompasses the machine and the machine control is consi...
Article
A new power electronics laboratory has been constructed at the University of Missouri-Rolla. Key components of the laboratory are a set of custom-designed hardware and software tools. The novel hardware tools include five mobile power electronics testbeds that each contain the semiconductor devices, gate-drive boards, voltage and current sensors, a...
Article
Automated, population-based design methods are becoming increasingly popular as design tools. When using these algorithms (e.g., Monte Carlo, genetic algorithms, particle swarm optimization), it is common to require the analysis of 10,000-1,000,000 individual designs. Unique challenges arise when using population-based methods to design magnetic co...

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