Search results for: J.W. Kimball

Items from 1 to 19 out of 19 results

article

Predicting Solar Irradiance Using Time Series Neural Networks

A. Alzahrani, J.W. Kimball, C. Dagli

Procedia Computer Science > 2014 > 36 > Complete > 623-628

Increasing the accuracy of prediction improves the performance of photovoltaic systems and alleviates the effects of intermittence on the systems stability. A Nonlinear Autoregressive Network with Exogenous Inputs (NARX) approach was applied to the Vichy-Rolla National Airport's photovoltaic station. The proposed model uses several inputs (e.g. time, day of the year, sky cover, pressure, and wind...

chapter

Direct power control of doubly-fed generator based wind turbine converters to improve Low Voltage Ride-Through during system imbalance

M.M. Baggu, L.D. Watson, J.W. Kimball, B.H. Chowdhury

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC) > 2121 - 2125

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition - APEC 2010

A novel control technique using direct active and reactive power control called Direct Power Control (DPC) is discussed for Low Voltage Ride Through (LVRT) of DFIG based wind turbine converters. This controller eliminates the conventional current loops and uses delta modulation comparators, which yields a faster response. The switching of the converter is done using a simple optimum switching table...

chapter

Sigma-delta modulation of multi-phase high frequency converters

J.W. Kimball, K.R. Eckler, L. Watson

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC) > 2202 - 2206

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition - APEC 2010

A power conversion control architecture is proposed that merges advanced digital modulation techniques, high frequency resonant converters, and multi-phase converters. If a converter's switching frequency is high enough, the converter may be turned on and off quickly to modulate power flow. The proposed system is composed of several high frequency converters connected in parallel, only a few of which...

chapter

Reducing common-mode voltage in three-phase sine-triangle PWM with interleaved carriers

J.W. Kimball, M. Zawodniok

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition (APEC) > 1508 - 1513

2010 Twenty-Fifth Annual IEEE Applied Power Electronics Conference and Exposition - APEC 2010

Interleaving PWM waveforms is a proven method to reduce ripple in dc-dc converters. The present work explores interleaving for three-phase motor drives. Fourier analysis shows that interleaving the carriers in conventional uniform PWM significantly reduces the common-mode voltage. New DSP hardware supports interleaving directly with changes to just two registers at setup time, so no additional computation...

chapter

Ac-ac dual active bridge converter for solid state transformer

Hengsi Qin, J.W. Kimball

2009 IEEE Energy Conversion Congress and Exposition > 3039 - 3044

2009 IEEE Energy Conversion Congress and Exposition (ECCE 2009)

This work investigates the application of an ac-ac dual active bridge converter for solid state transformer. The proposed converter topology consists of two active H-bridges and one high frequency transformer. Four-quadrant switch cells are used to ensure bi-directional power flow. The advantages of direct ac-ac conversion include fewer power conversion stages and minimized passive components. The...

chapter

TILAS: A Simple Analysis Tool for Estimating Power Losses in an IGBT-Diode Pair under Hysteresis Control in Three-Phase Inverters

A.M. Bazzi, J.W. Kimball, K. Kepley, P.T. Krein

2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition > 637 - 641

2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition (APEC)

Several techniques for analyzing and estimating power losses in insulated-gate bipolar transistors (IGBTs), diodes, MOSFETs, and other power electronics switching devices are known. Most of the approaches in the literature deal with periodic pulse width modulation (PWM) switching schemes. This paper presents a simple analysis tool to estimate these losses under aperiodic switching schemes, e.g. hysteresis...

article

A System Design Approach for Unattended Solar Energy Harvesting Supply

J.W. Kimball, B.T. Kuhn, R.S. Balog

IEEE Transactions on Power Electronics > 2009 > 24 > 4 > 952 - 962

Remote devices, such as sensors and communications devices, require continuously available power. In many applications, conventional approaches are too expensive, too large, or unreliable. For short-term needs, primary batteries may be used. However, they do not scale up well for long-term installations. Instead, energy harvesting methods must be used. Here, a system design approach is introduced...

chapter

Non-droop methods for context-sensitive sharing in multi-module switching converters

P.T. Krein, J.W. Kimball, B.T. Kuhn

2008 11th Workshop on Control and Modeling for Power Electronics > 1 - 4

Eleventh IEEE Workshop on Control and Modeling for Power Electronics

This paper introduces automatic methods that support intentional nonuniform power or current sharing in multi-module DC-DC converter configurations. Sharing that is proportional to ratings or to external weighting values is supported. The methods extend to input-series output-parallel and input-parallel output-series connections as well as to conventional parallel-parallel configurations.

chapter

A current-sensorless digital controller for active power factor correction control based on Kalman filters

J.W. Kimball, P.T. Krein

2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition > 1328 - 1333

2008 Twenty-Third Annual IEEE Applied Power Electronics Conference and Exposition (APEC '08)

For low-power AC-DC converters, power factor correction (PFC) can be accomplished simply with certain converters operating in discontinuous conduction mode (DCM). At higher power levels, DCM results in higher losses, so most PFC converters use current feedback to actively track the correct current waveshape. This work presents a way to provide PFC control without the current sensor, by replacing the...

article

A Stabilizing, High-Performance Controller for Input Series-Output Parallel Converters

J.W. Kimball, J.T. Mossoba, P.T. Krein

IEEE Transactions on Power Electronics > 2008 > 23 > 3 > 1416 - 1427

A form of sensorless current mode (SCM) control stabilizes sharing in multiphase input-series-output-parallel (ISOP) dc-dc converter topologies. Previously, ISOP converters have been proposed to reduce the voltage and current ratings of switching devices. Since the inputs are all connected in series, each phase need only be rated for a fraction of the total input voltage. Voltage and current sharing...

article

Singular Perturbation Theory for DC–DC Converters and Application to PFC Converters

J.W. Kimball, P.T. Krein

IEEE Transactions on Power Electronics > 2008 > 23 > 6 > 2970 - 2981

Many control schemes for DC-DC converters begin with the assertion that inductor currents are ldquofastrdquo states and capacitor voltages are ldquoslowrdquo states. This assertion must be true for power factor correction (PFC) converters to allow independent control of current and voltage, and is important for many other applications. In the present study, singular perturbation theory is applied...

chapter

Increased Performance of Battery Packs by Active Equalization

J.W. Kimball, B.T. Kuhn, P.T. Krein

2007 IEEE Vehicle Power and Propulsion Conference > 323 - 327

2007 Vehicle Power and Propulsion Conference

Battery packs for most applications are series strings of electrochemical cells. Due to manufacturing variations, temperature differences, and aging, the individual cells perform differently. When a complete pack is charged and discharged as a single two-terminal circuit element, some cells are chronically overcharged, undercharged, or overdischarged, all of which act to reduce cell life. The performance...

chapter

Singular Perturbation Theory for DC-DC Converters and Application to PFC Converters

J.W. Kimball, P.T. Krein

2007 IEEE Power Electronics Specialists Conference > 882 - 887

IEEE 38th Annual Power Electronics Specialists Conference

Many control schemes for dc-dc converters begin with the assertion that inductor currents are "fast" states and capacitor voltages are "slow" states. This assertion must be true for power factor correction (PFC) converters to allow independent control of current and voltage. In the present work, singular perturbation theory is applied to boost converters to provide rigorous justification...

chapter

Digital Ripple Correlation Control for Photovoltaic Applications

J.W. Kimball, P.T. Krein

2007 IEEE Power Electronics Specialists Conference > 1690 - 1694

IEEE 38th Annual Power Electronics Specialists Conference

Ripple correlation control (RCC) is a fast, robust online optimization technique. RCC is particularly suited for switching power converters, where the inherent ripple provides information about the system operating point. The present work examines a digital formulation that has reduced power consumption and greater robustness. A maximum power point tracker for a photovoltaic panel demonstrates greater...

article

Dynamic Maximum Power Point Tracking of Photovoltaic Arrays Using Ripple Correlation Control

T. Esram, J.W. Kimball, P.T. Krein, P.L. Chapman, more

IEEE Transactions on Power Electronics > 2006 > 21 > 5 > 1282 - 1291

A dynamically rapid method used for tracking the maximum power point of photovoltaic arrays, known as ripple correlation control, is presented and verified against experiment. The technique takes advantage of the signal ripple, which is automatically present in power converters. The ripple is interpreted as a perturbation from which a gradient ascent optimization can be realized. The technique converges...

chapter

Control Technique for Series Input-Parallel Output Converter Topologies

J.W. Kimball, J.T. Mossoba, P.T. Krein

2005 IEEE 36th Power Electronics Specialists Conference > 1441 - 1445

2005 IEEE 36th Power Electronic Specialists Conference

A series input-parallel output DC-DC converter topology inherently provides output current sharing among the phases, provided the input voltages are forced to share. With conventional output voltage feedback controls, input voltage sharing is unstable. Recent literature work proposes complicated feedback loops to provide stable voltage sharing, at the expense of dynamic performance. In the current...

chapter

Machine design considerations for the future energy challenge

J.W. Kimball, M. Amrhein

Proceedings Electrical Insulation Conference and Electrical Manufacturing Expo, 2005. > 448 - 453

Proceedings: Electrical Insulation and Electrical Manufacturing Conference

Motors consume a significant fraction of electricity in the United States and in the world. As part of the International Future Energy Challenge, student teams are endeavoring to improve the efficiency of fractional-horsepower machines. The present work summarizes the motor design and construction process for a 500 W prototype induction machine targeting efficiency above 80%. Analytical and finite-element...

chapter

Modeling Controlled Switches and Diodes for Electro-Thermal Simulation

J.W. Kimball

2005 IEEE 36th Power Electronics Specialists Conference > 2175 - 2179

2005 IEEE 36th Power Electronic Specialists Conference

Designers of advanced power converters may choose from a variety of switching device models for simulation. Some situations call for simple idealized models, while others require physics-based models. When evaluating thermal system performance, a behavioral model that includes both conduction and switching losses is desired. A set of models has been developed to include both unidirectional devices,...

chapter

Analysis and design of switched capacitor converters

J.W. Kimball, P.T. Krein

Twentieth Annual IEEE Applied Power Electronics Conference and Exposition, 2005. APEC 2005. > 3 > 1473 - 1477 Vol. 3

APEC 2005. Twentieth Annual IEEE Applied Power Electronics Conference and Exposition

Switched capacitor converters have become more common in recent years. Crucial to understanding the maximum power throughput and efficiency is a model of the converter's equivalent resistance. A new form for equivalent resistance is derived and discussed in a design context. Quasi-resonant operation is also explored and compared to non-resonant operation. Several capacitor technologies are evaluated...

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Search results for: J.W. Kimball

Predicting Solar Irradiance Using Time Series Neural Networks

Direct power control of doubly-fed generator based wind turbine converters to improve Low Voltage Ride-Through during system imbalance

Sigma-delta modulation of multi-phase high frequency converters

Reducing common-mode voltage in three-phase sine-triangle PWM with interleaved carriers

Ac-ac dual active bridge converter for solid state transformer

TILAS: A Simple Analysis Tool for Estimating Power Losses in an IGBT-Diode Pair under Hysteresis Control in Three-Phase Inverters

A System Design Approach for Unattended Solar Energy Harvesting Supply

Non-droop methods for context-sensitive sharing in multi-module switching converters

A current-sensorless digital controller for active power factor correction control based on Kalman filters

A Stabilizing, High-Performance Controller for Input Series-Output Parallel Converters

Singular Perturbation Theory for DC–DC Converters and Application to PFC Converters

Increased Performance of Battery Packs by Active Equalization

Singular Perturbation Theory for DC-DC Converters and Application to PFC Converters

Digital Ripple Correlation Control for Photovoltaic Applications

Dynamic Maximum Power Point Tracking of Photovoltaic Arrays Using Ripple Correlation Control

Control Technique for Series Input-Parallel Output Converter Topologies

Machine design considerations for the future energy challenge

Modeling Controlled Switches and Diodes for Electro-Thermal Simulation

Analysis and design of switched capacitor converters

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