David Dorrell - Profile on Academia.edu (original) (raw)
Papers by David Dorrell
The brushless doubly-fed reluctance machine has two sets of stator windings of different pole num... more The brushless doubly-fed reluctance machine has two sets of stator windings of different pole number linked by a reluctance type of rotor. The rotor modulates the stator MMF from one winding so that flux links the other winding creating mutual coupling. This is still a research machine and the design methodology is under development. Past works indicates that a ducted rotor with radial laminations is best suited to be the reluctance rotor. In this paper the geometry of the rotor is investigated. If the ducts are too thin then the reluctance ratio is low and the coupling is affected. If they are too wide then the reluctance path for the coupling flux is high and the machine will saturate quickly. It is found, using finite element analysis, that the duct ratio should be about 38% from the results in the paper. This is in line with previous work on synchronous reluctance machines that can also use ducted rotors (although they use axial lamination which are inappropriate for this application).
Ultracapacitor modelling and parameter identification using the Extended Kalman Filter
2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014
Dimension effect on a grid-connected brushless doubly-fed reluctance generator
2014 17th International Conference on Electrical Machines and Systems (ICEMS), 2014
Model-predictive direct power control of doubly-fed induction generators under unbalanced grid voltage conditions in wind energy applications
IET Renewable Power Generation, 2014
ABSTRACT
Measurement and Calculation of Unbalanced Magnetic Pull in Wound Rotor Induction Machine
IEEE Transactions on Magnetics, 2014
An Analytical Method Combining Equivalent Circuit and Magnetic Circuit for BDFRG
IEEE Transactions on Magnetics, 2014
ABSTRACT This paper presents an analytical method that integrates the equivalent circuit (EC) and... more ABSTRACT This paper presents an analytical method that integrates the equivalent circuit (EC) and magnetic circuit (MC) in order to analyze and design a brushless doubly fed reluctance generator (BDFRG). The proposed method is capable of evaluating the BDFRG performance at the design stage because the terminal voltage can be predicted through the MC and the torque can be calculated from the EC. The MC is used to calculate the air gap flux density so that the flux linkage can be further obtained for the calculation of the machine performance using the EC and a set of particular operating conditions. The integration of the EC and MC provides a rapid analysis for a direct connection between the physical dimensions and the machine performances, including torque, mechanical power, electric power, and efficiency. The proposed analytical method is applied to two BDFRG designs. One is a manufactured prototype. Finite element analysis and experiments are used to verify the analytical results.
Renewable Energy, 2011
This paper examines the appropriateness of the Fast Fourier Transform for decomposition and recon... more This paper examines the appropriateness of the Fast Fourier Transform for decomposition and reconstruction of wave records taken at fixed locations and transposed to a different temporal and spatial point. In marine renewable energy, advanced control methods based on the future prediction of waves are being developed. These methods are based on the assumption that a forward looking prediction is available and over the years there has been a conjecture that the FFT may perform this role and that the prediction of wave behaviour at any point on the sea surface should be realizable. The validity of this statement is tested using numerical wave records.
Issues with the design of brushless doubly-fed reluctance machines: Unbalanced magnetic pull, skew and iron losses
2011 IEEE International Electric Machines & Drives Conference (IEMDC), 2011
... literature: the Brushless Doubly Fed Induction Machine [2]-[4] and the Brushless Doubly Fed R... more ... literature: the Brushless Doubly Fed Induction Machine [2]-[4] and the Brushless Doubly Fed Reluctance Machine ... with a small degree of skew offset between them Iron losses are discussed ... Secondly, while the axially-laminated rotor in [7] produces eddy current loss, it is very ...
Fault ride-through of doubly-fed induction generator with converter protection schemes
2008 IEEE International Conference on Sustainable Energy Technologies, 2008
... j.yang@elec.gla.ac.uk). DG Dorrell is with the Mechatronics and Intelligent Systems Group, En... more ... j.yang@elec.gla.ac.uk). DG Dorrell is with the Mechatronics and Intelligent Systems Group, Engineering, University of Technology, Sydney, NSW, Australia (e-mail:david.dorrell@uts.edu.au). JE Fletcher is with the Department ...
Establishing the Power Factor Limitations for Synchronous Reluctance Machines
IEEE Transactions on Magnetics, 2015
ABSTRACT
Review of wireless charging coupler for electric vehicles
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
ABSTRACT
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
Electric vehicles (EVs) are one component in the pursuit of clean and sustainable energy sources.... more Electric vehicles (EVs) are one component in the pursuit of clean and sustainable energy sources. They allow clean electric energy to be utilized in transportation and reduce pollution in the urban environment. Hybrid Energy Storage Systems (HESS) can be utilized in EVs and these comprise of batteries and ultracapacitors. They allow for the full use of both the high energy density characteristic of the batteries and the high power density performance of the ultracapacitors to achieve a satisfying driving range while meeting transient power demands at an acceptable manufacturing cost. In this paper, component sizing is investigated as an optimization problem with the aim of minimizing the cost of the energy storage system. The problem is solved using a Genetic Algorithm (GA) for an example EV. In the implementation of the GA, the driving performance requirements are set as the constraints and formulated with penalty functions. This is because the GA is not appropriate for constrained optimization problems. In order to enhance the robustness of the sizing, three different driving cycles are incorporated into the optimization process. They are the NEDC, UDDS and CHINACITY cycles. The result is obtained and the effectiveness and reliability of the GA are further verified by implementing another optimization using the Particle Swarm Optimization (PSO) algorithm.
Brushless doubly-fed reluctance machine rotor design
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012
Loss Analysis of Circular Wireless EV Charging Coupler
IEEE Transactions on Magnetics, 2014
A comparative study of direct power control of AC/DC converters for renewable energy generation
IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society, 2011
ABSTRACT
Model Predictive Control of Grid-Connected Inverters for PV Systems With Flexible Power Regulation and Switching Frequency Reduction
IEEE Transactions on Industry Applications, 2015
ABSTRACT This paper presents a model-predictive direct power control (MPDPC) strategy for a grid-... more ABSTRACT This paper presents a model-predictive direct power control (MPDPC) strategy for a grid-connected inverter used in a PV system. Thus is aimed at use in distributed generation. The controller uses a system model to predict the system behavior at each sampling instant. The voltage vector generating least power ripples will then be selected according to a cost function and applied during the next sampling period, thus flexible power regulation can be achieved. In addition, the influences of one-step delay in digital implementation is investigated and compensated using a model based prediction scheme. Furthermore, a switching frequency reduction algorithm is developed by adding a nonlinear constraint to the cost function, which is a significant advantage in higher-power applications. The effectiveness of the proposed MPC strategy was verified numerically by using MATLAB/Simulink, and validated experimentally using a laboratory prototype.
Model-predictive direct power control of AC/DC converters with one step delay compensation
IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, 2012
ABSTRACT
2011 IEEE Energy Conversion Congress and Exposition, 2011
Predictive direct control has been proposed and well developed because of its combination of simp... more Predictive direct control has been proposed and well developed because of its combination of simplicity and excellent steady-state and transient performance. This paper presents a predictive direct control strategy of doubly fed induction generator (DFIG) for grid synchronization. In noload mode, predictive direct virtual torque control (PDVTC) is employed to meet the grid synchronization conditions. In gridconnected mode, the stator is connected to the grid, predictive direct power control (PDPC) is utilized with the purpose of flexible active and reactive power regulation. Furthermore, a rotor position sensorless scheme is proposed to make the control structure simpler during the grid synchronization process. The whole system is very simple and robust while the smooth and fast grid synchronization is achieved.
Analysis of axial voltages and inter-bar currents in cast copper cage rotors during DC current injection as an aid to identify casting faults
2009 35th Annual Conference of IEEE Industrial Electronics, 2009
Page 1. Analysis of Axial Voltages and Inter-bar Currents in Cast Copper Cage Rotors during DC Cu... more Page 1. Analysis of Axial Voltages and Inter-bar Currents in Cast Copper Cage Rotors during DC Current Injection as an Aid to Identify Casting Faults David G. Dorrell1, Lucia Frosini2, Marcello Bottani2, Giacomo Galbiati2 Min ...
Energies, 2014
Ultracapacitors (UCs) are the focus of increasing attention in electric vehicle and renewable ene... more Ultracapacitors (UCs) are the focus of increasing attention in electric vehicle and renewable energy system applications due to their excellent performance in terms of power density, efficiency, and lifespan. Modeling and parameterization of UCs play an important role in model-based regulation and management for a reliable and safe operation. In this paper, an equivalent circuit model template composed of a bulk capacitor, a second-order capacitance-resistance network, and a series resistance, is employed to represent the dynamics of UCs. The extended Kalman Filter is then used to recursively estimate the model parameters in the Dynamic Stress Test (DST) on a specially established test rig. The DST loading profile is able to emulate the practical power sinking and sourcing of UCs in electric vehicles. In order to examine the accuracy of the identified model, a Hybrid Pulse Power Characterization test is carried out. The validation result demonstrates that the recursively calibrated model can precisely delineate the dynamic voltage behavior of UCs under the discrepant loading condition, and the online identification approach is thus capable of extracting the model parameters in a credible and robust manner.
The brushless doubly-fed reluctance machine has two sets of stator windings of different pole num... more The brushless doubly-fed reluctance machine has two sets of stator windings of different pole number linked by a reluctance type of rotor. The rotor modulates the stator MMF from one winding so that flux links the other winding creating mutual coupling. This is still a research machine and the design methodology is under development. Past works indicates that a ducted rotor with radial laminations is best suited to be the reluctance rotor. In this paper the geometry of the rotor is investigated. If the ducts are too thin then the reluctance ratio is low and the coupling is affected. If they are too wide then the reluctance path for the coupling flux is high and the machine will saturate quickly. It is found, using finite element analysis, that the duct ratio should be about 38% from the results in the paper. This is in line with previous work on synchronous reluctance machines that can also use ducted rotors (although they use axial lamination which are inappropriate for this application).
Ultracapacitor modelling and parameter identification using the Extended Kalman Filter
2014 IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014
Dimension effect on a grid-connected brushless doubly-fed reluctance generator
2014 17th International Conference on Electrical Machines and Systems (ICEMS), 2014
Model-predictive direct power control of doubly-fed induction generators under unbalanced grid voltage conditions in wind energy applications
IET Renewable Power Generation, 2014
ABSTRACT
Measurement and Calculation of Unbalanced Magnetic Pull in Wound Rotor Induction Machine
IEEE Transactions on Magnetics, 2014
An Analytical Method Combining Equivalent Circuit and Magnetic Circuit for BDFRG
IEEE Transactions on Magnetics, 2014
ABSTRACT This paper presents an analytical method that integrates the equivalent circuit (EC) and... more ABSTRACT This paper presents an analytical method that integrates the equivalent circuit (EC) and magnetic circuit (MC) in order to analyze and design a brushless doubly fed reluctance generator (BDFRG). The proposed method is capable of evaluating the BDFRG performance at the design stage because the terminal voltage can be predicted through the MC and the torque can be calculated from the EC. The MC is used to calculate the air gap flux density so that the flux linkage can be further obtained for the calculation of the machine performance using the EC and a set of particular operating conditions. The integration of the EC and MC provides a rapid analysis for a direct connection between the physical dimensions and the machine performances, including torque, mechanical power, electric power, and efficiency. The proposed analytical method is applied to two BDFRG designs. One is a manufactured prototype. Finite element analysis and experiments are used to verify the analytical results.
Renewable Energy, 2011
This paper examines the appropriateness of the Fast Fourier Transform for decomposition and recon... more This paper examines the appropriateness of the Fast Fourier Transform for decomposition and reconstruction of wave records taken at fixed locations and transposed to a different temporal and spatial point. In marine renewable energy, advanced control methods based on the future prediction of waves are being developed. These methods are based on the assumption that a forward looking prediction is available and over the years there has been a conjecture that the FFT may perform this role and that the prediction of wave behaviour at any point on the sea surface should be realizable. The validity of this statement is tested using numerical wave records.
Issues with the design of brushless doubly-fed reluctance machines: Unbalanced magnetic pull, skew and iron losses
2011 IEEE International Electric Machines & Drives Conference (IEMDC), 2011
... literature: the Brushless Doubly Fed Induction Machine [2]-[4] and the Brushless Doubly Fed R... more ... literature: the Brushless Doubly Fed Induction Machine [2]-[4] and the Brushless Doubly Fed Reluctance Machine ... with a small degree of skew offset between them Iron losses are discussed ... Secondly, while the axially-laminated rotor in [7] produces eddy current loss, it is very ...
Fault ride-through of doubly-fed induction generator with converter protection schemes
2008 IEEE International Conference on Sustainable Energy Technologies, 2008
... j.yang@elec.gla.ac.uk). DG Dorrell is with the Mechatronics and Intelligent Systems Group, En... more ... j.yang@elec.gla.ac.uk). DG Dorrell is with the Mechatronics and Intelligent Systems Group, Engineering, University of Technology, Sydney, NSW, Australia (e-mail:david.dorrell@uts.edu.au). JE Fletcher is with the Department ...
Establishing the Power Factor Limitations for Synchronous Reluctance Machines
IEEE Transactions on Magnetics, 2015
ABSTRACT
Review of wireless charging coupler for electric vehicles
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
ABSTRACT
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
Electric vehicles (EVs) are one component in the pursuit of clean and sustainable energy sources.... more Electric vehicles (EVs) are one component in the pursuit of clean and sustainable energy sources. They allow clean electric energy to be utilized in transportation and reduce pollution in the urban environment. Hybrid Energy Storage Systems (HESS) can be utilized in EVs and these comprise of batteries and ultracapacitors. They allow for the full use of both the high energy density characteristic of the batteries and the high power density performance of the ultracapacitors to achieve a satisfying driving range while meeting transient power demands at an acceptable manufacturing cost. In this paper, component sizing is investigated as an optimization problem with the aim of minimizing the cost of the energy storage system. The problem is solved using a Genetic Algorithm (GA) for an example EV. In the implementation of the GA, the driving performance requirements are set as the constraints and formulated with penalty functions. This is because the GA is not appropriate for constrained optimization problems. In order to enhance the robustness of the sizing, three different driving cycles are incorporated into the optimization process. They are the NEDC, UDDS and CHINACITY cycles. The result is obtained and the effectiveness and reliability of the GA are further verified by implementing another optimization using the Particle Swarm Optimization (PSO) algorithm.
Brushless doubly-fed reluctance machine rotor design
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012
Loss Analysis of Circular Wireless EV Charging Coupler
IEEE Transactions on Magnetics, 2014
A comparative study of direct power control of AC/DC converters for renewable energy generation
IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society, 2011
ABSTRACT
Model Predictive Control of Grid-Connected Inverters for PV Systems With Flexible Power Regulation and Switching Frequency Reduction
IEEE Transactions on Industry Applications, 2015
ABSTRACT This paper presents a model-predictive direct power control (MPDPC) strategy for a grid-... more ABSTRACT This paper presents a model-predictive direct power control (MPDPC) strategy for a grid-connected inverter used in a PV system. Thus is aimed at use in distributed generation. The controller uses a system model to predict the system behavior at each sampling instant. The voltage vector generating least power ripples will then be selected according to a cost function and applied during the next sampling period, thus flexible power regulation can be achieved. In addition, the influences of one-step delay in digital implementation is investigated and compensated using a model based prediction scheme. Furthermore, a switching frequency reduction algorithm is developed by adding a nonlinear constraint to the cost function, which is a significant advantage in higher-power applications. The effectiveness of the proposed MPC strategy was verified numerically by using MATLAB/Simulink, and validated experimentally using a laboratory prototype.
Model-predictive direct power control of AC/DC converters with one step delay compensation
IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, 2012
ABSTRACT
2011 IEEE Energy Conversion Congress and Exposition, 2011
Predictive direct control has been proposed and well developed because of its combination of simp... more Predictive direct control has been proposed and well developed because of its combination of simplicity and excellent steady-state and transient performance. This paper presents a predictive direct control strategy of doubly fed induction generator (DFIG) for grid synchronization. In noload mode, predictive direct virtual torque control (PDVTC) is employed to meet the grid synchronization conditions. In gridconnected mode, the stator is connected to the grid, predictive direct power control (PDPC) is utilized with the purpose of flexible active and reactive power regulation. Furthermore, a rotor position sensorless scheme is proposed to make the control structure simpler during the grid synchronization process. The whole system is very simple and robust while the smooth and fast grid synchronization is achieved.
Analysis of axial voltages and inter-bar currents in cast copper cage rotors during DC current injection as an aid to identify casting faults
2009 35th Annual Conference of IEEE Industrial Electronics, 2009
Page 1. Analysis of Axial Voltages and Inter-bar Currents in Cast Copper Cage Rotors during DC Cu... more Page 1. Analysis of Axial Voltages and Inter-bar Currents in Cast Copper Cage Rotors during DC Current Injection as an Aid to Identify Casting Faults David G. Dorrell1, Lucia Frosini2, Marcello Bottani2, Giacomo Galbiati2 Min ...
Energies, 2014
Ultracapacitors (UCs) are the focus of increasing attention in electric vehicle and renewable ene... more Ultracapacitors (UCs) are the focus of increasing attention in electric vehicle and renewable energy system applications due to their excellent performance in terms of power density, efficiency, and lifespan. Modeling and parameterization of UCs play an important role in model-based regulation and management for a reliable and safe operation. In this paper, an equivalent circuit model template composed of a bulk capacitor, a second-order capacitance-resistance network, and a series resistance, is employed to represent the dynamics of UCs. The extended Kalman Filter is then used to recursively estimate the model parameters in the Dynamic Stress Test (DST) on a specially established test rig. The DST loading profile is able to emulate the practical power sinking and sourcing of UCs in electric vehicles. In order to examine the accuracy of the identified model, a Hybrid Pulse Power Characterization test is carried out. The validation result demonstrates that the recursively calibrated model can precisely delineate the dynamic voltage behavior of UCs under the discrepant loading condition, and the online identification approach is thus capable of extracting the model parameters in a credible and robust manner.