Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523709
L. Graber, M. Steurer, J. Kvitkovic, M. Kofler, S. Pekarek, R. Howard, A. Taher, M. Mazzola, A. Card
Several key performance parameters of shipboard power systems are affected by the grounding scheme applied. The grounding scheme impacts the nature of voltage transients during switching events and faults, identifiability and locatability of ground faults, fault current levels, and power quality. Power system simulations play an important role in choosing an appropriate grounding scheme and optimizing its components. The tools typically used for power system analysis need to be carefully tested to determine if they are appropriate for modeling effects of different grounding schemes and in particular the high frequency transients. This paper sheds light on modeling and validation techniques specific to grounding models. Furthermore, insight is provided to present research into new types of power system modeling techniques based on scattering parameters for improved accuracy at higher frequencies of interest. A testbed designed to study the impact of different types of grounding schemes is also introduced and first characterization measurements in the frequency domain provided. The paper concludes with an outlook to future work, which will focus on rigorous validation of the models developed.
{"title":"Time and frequency domain methods to evaluate grounding strategies for medium voltage DC shipboard power systems","authors":"L. Graber, M. Steurer, J. Kvitkovic, M. Kofler, S. Pekarek, R. Howard, A. Taher, M. Mazzola, A. Card","doi":"10.1109/ESTS.2013.6523709","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523709","url":null,"abstract":"Several key performance parameters of shipboard power systems are affected by the grounding scheme applied. The grounding scheme impacts the nature of voltage transients during switching events and faults, identifiability and locatability of ground faults, fault current levels, and power quality. Power system simulations play an important role in choosing an appropriate grounding scheme and optimizing its components. The tools typically used for power system analysis need to be carefully tested to determine if they are appropriate for modeling effects of different grounding schemes and in particular the high frequency transients. This paper sheds light on modeling and validation techniques specific to grounding models. Furthermore, insight is provided to present research into new types of power system modeling techniques based on scattering parameters for improved accuracy at higher frequencies of interest. A testbed designed to study the impact of different types of grounding schemes is also introduced and first characterization measurements in the frequency domain provided. The paper concludes with an outlook to future work, which will focus on rigorous validation of the models developed.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"149 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117179143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523707
M. Belkhayat, J. Gonzalez, J. Verhulst
Impedance based stability techniques have been developed since the 80s for stable filter and converter designs. More recently, similar impedance techniques have been used to impose stability requirements on power systems including distributed converters. Significant effort has been spent on the development of models and impedance characterizations for regulated DC-DC converters and AC-DC converters. For rotating machinery however, and in particular synchronous machines, very little has been published on impedance characterizations. In this paper, the DQ impedance of a regulated synchronous machine is developed and compared to a hardware-validated Saber model of the synchronous machine. The DQ impedance expressions are derived based on the fixed-field impedances, the droop parameter, and simplified transfer functions for the exciter and the regulator. The analytical results are compared to the numerical results obtained from the Saber model.
{"title":"DQ impedance of a regulated synchronous machine","authors":"M. Belkhayat, J. Gonzalez, J. Verhulst","doi":"10.1109/ESTS.2013.6523707","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523707","url":null,"abstract":"Impedance based stability techniques have been developed since the 80s for stable filter and converter designs. More recently, similar impedance techniques have been used to impose stability requirements on power systems including distributed converters. Significant effort has been spent on the development of models and impedance characterizations for regulated DC-DC converters and AC-DC converters. For rotating machinery however, and in particular synchronous machines, very little has been published on impedance characterizations. In this paper, the DQ impedance of a regulated synchronous machine is developed and compared to a hardware-validated Saber model of the synchronous machine. The DQ impedance expressions are derived based on the fixed-field impedances, the droop parameter, and simplified transfer functions for the exciter and the regulator. The analytical results are compared to the numerical results obtained from the Saber model.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132597246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523775
M. Gaudreau, M. Kempkes, N. Reinhardt, K. Schrock, K. Vaughan
Diversified Technologies, Inc. (DTI) has developed a connector which reliably transfers power and data to submersibles while under water. Rather than making incremental improvements to the electromechanical design of existing direct contact connectors, DTI has developed a non-contact connector which transmits power and data by inductive and capacitive coupling. The key innovation of this breakthrough is the ability to transfer power and data at high levels (10s of kWs and 10s of Gbps) over the same connector.
{"title":"Water impermeable, easy-disconnect electrical cable connector for deep sea applications","authors":"M. Gaudreau, M. Kempkes, N. Reinhardt, K. Schrock, K. Vaughan","doi":"10.1109/ESTS.2013.6523775","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523775","url":null,"abstract":"Diversified Technologies, Inc. (DTI) has developed a connector which reliably transfers power and data to submersibles while under water. Rather than making incremental improvements to the electromechanical design of existing direct contact connectors, DTI has developed a non-contact connector which transmits power and data by inductive and capacitive coupling. The key innovation of this breakthrough is the ability to transfer power and data at high levels (10s of kWs and 10s of Gbps) over the same connector.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131452138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523724
A. Asrari, M. Alattar, S. Abdelwahed, M. Mazzola
In this paper, a general method to automatically create admittance matrices for power electric networks is presented. This is a part of a joint project between Mississippi State University and University of Texas at Austin Center for Electromechanics (CEM). Starting with an electric network designed in the Mathworks software Simulink (SimPowerSystems) and output from Simulink as an XML file, we parse the XML file for the relevant information (blocks, connectivity, and parameters). The underlying algorithm consists of four stages: 1) Calculate the conductance values of the components in each block, 2) Build a matrix representing the connectivity of components, 3) Assign a unique number for each node, and finally 4) Calculate the admittance matrix using the data obtained from the previous steps. This is the initial work to support the development of a parallel computing tool where the power system will be solved using a tool developed by the University of Texas called CEMSolver. The second phase of this joint project will be finding the most optimal partitioned systems in such a way that the matrices of each partition are distributed to different CPUs and the total CPU usage for these subsystems will be minimal. Thus, the power system will be partitioned and each partition will have its own admittance matrix.
{"title":"A general algorithm to automatically create admittance matrices for electric networks","authors":"A. Asrari, M. Alattar, S. Abdelwahed, M. Mazzola","doi":"10.1109/ESTS.2013.6523724","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523724","url":null,"abstract":"In this paper, a general method to automatically create admittance matrices for power electric networks is presented. This is a part of a joint project between Mississippi State University and University of Texas at Austin Center for Electromechanics (CEM). Starting with an electric network designed in the Mathworks software Simulink (SimPowerSystems) and output from Simulink as an XML file, we parse the XML file for the relevant information (blocks, connectivity, and parameters). The underlying algorithm consists of four stages: 1) Calculate the conductance values of the components in each block, 2) Build a matrix representing the connectivity of components, 3) Assign a unique number for each node, and finally 4) Calculate the admittance matrix using the data obtained from the previous steps. This is the initial work to support the development of a parallel computing tool where the power system will be solved using a tool developed by the University of Texas called CEMSolver. The second phase of this joint project will be finding the most optimal partitioned systems in such a way that the matrices of each partition are distributed to different CPUs and the total CPU usage for these subsystems will be minimal. Thus, the power system will be partitioned and each partition will have its own admittance matrix.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"202 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124536936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523762
C. Heising, T. Schrader, R. Bartelt, V. Staudt, A. Steimel
In all-electric ship applications, energy transfer in the range of many megawatts is required. The optimal grid-voltage level in this range is medium voltage, e.g. 10 kV. For DC as well as for AC ship grids, power-electronic converters connect generators and loads to the grid. In case of a DC grid, direct connection of the converter is mandatory, for an AC grid it eliminates the transformer and increases efficiency. The most promising converter type for such requirements is the Modular Multilevel Converter (MMC). However, the control of such a converter - essential for operability and stability - is a challenge, specially during dynamics. This results from the internal single-phase structure of the converter. In this paper, a highly dynamic MMC control for electric-ship applications is introduced. It relies on the Pole-restraining principle, providing fast, stable and robust control. Time-domain analyses of the control dynamics verify the suitability of the chosen approach.
{"title":"Pole-restraining control for Modular Multilevel Converters in electric-ship applications","authors":"C. Heising, T. Schrader, R. Bartelt, V. Staudt, A. Steimel","doi":"10.1109/ESTS.2013.6523762","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523762","url":null,"abstract":"In all-electric ship applications, energy transfer in the range of many megawatts is required. The optimal grid-voltage level in this range is medium voltage, e.g. 10 kV. For DC as well as for AC ship grids, power-electronic converters connect generators and loads to the grid. In case of a DC grid, direct connection of the converter is mandatory, for an AC grid it eliminates the transformer and increases efficiency. The most promising converter type for such requirements is the Modular Multilevel Converter (MMC). However, the control of such a converter - essential for operability and stability - is a challenge, specially during dynamics. This results from the internal single-phase structure of the converter. In this paper, a highly dynamic MMC control for electric-ship applications is introduced. It relies on the Pole-restraining principle, providing fast, stable and robust control. Time-domain analyses of the control dynamics verify the suitability of the chosen approach.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114261187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523708
J. Lorenz
Operating losses directly impact the temperature profiles, life, and efficiency of electrical machines. Achieving accurate predictions of machine performance early in the design process can be a significant challenge. Finite element methods for predicting critical machine performance parameters such as operating losses and efficiency can be used, and advances in computing capabilities have allowed for more extensive use of this approach. This paper is focused on the concepts used in a new and unique method for predicting machine iron losses using transient finite element methods (FEM). A significant difference of the new method is the manner in which the predictive loss function is arrived at given lamination steel experimental loss test data. The new iron loss predictive function is compared to a common historical method for several lamination steels.
{"title":"Electrical machine iron loss predictions - A unique engineering approach utilizing transient finite element methods - Part 1: Theory and calculation method","authors":"J. Lorenz","doi":"10.1109/ESTS.2013.6523708","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523708","url":null,"abstract":"Operating losses directly impact the temperature profiles, life, and efficiency of electrical machines. Achieving accurate predictions of machine performance early in the design process can be a significant challenge. Finite element methods for predicting critical machine performance parameters such as operating losses and efficiency can be used, and advances in computing capabilities have allowed for more extensive use of this approach. This paper is focused on the concepts used in a new and unique method for predicting machine iron losses using transient finite element methods (FEM). A significant difference of the new method is the manner in which the predictive loss function is arrived at given lamination steel experimental loss test data. The new iron loss predictive function is compared to a common historical method for several lamination steels.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114832811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523755
Tianlei Zhang, R. Dougal, Yucheng Zhang
Designers of shipboard power systems must consider many tradeoffs when selecting generators in the early-stage set-based design. This is not just an “equipment problem” based on physical design requirements such as limits of size and weight. The operating strategy for generators must be considered when evaluating the goodness of the design. To this end, this paper develops a design approach to impose system-level controls onto generating plants to evaluate their optimality. Two critical design metrics-fuel consumption and quality of service (QOS) are defined to incorporate these control variables, and co-optimized to reflect mission-oriented system performance. The minimum fuel consumption is computed based on a new concept of economic dispatch algorithm, which takes active and reactive power balance, and system redundancy requirements into account. QOS metric is defined to reflect system-level control strategies based on the classical concept of mean-time-between-failure, which is defined to depend inversely on the power produced. We develop a multi-objective particle swarm optimization to effectively locate the Pareto fronts of system performance for all design alternatives over a whole given mission. Thus a set of optimal design alternatives can be rapidly selected to represent the non-dominated optimal compromises of the two metrics. This design approach is demonstrated and compared with a single-objective design approach in a design example of shipboard generating plant design. And more optimal alternatives are able to be found.
{"title":"Accounting for system-level controls during early-stage design","authors":"Tianlei Zhang, R. Dougal, Yucheng Zhang","doi":"10.1109/ESTS.2013.6523755","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523755","url":null,"abstract":"Designers of shipboard power systems must consider many tradeoffs when selecting generators in the early-stage set-based design. This is not just an “equipment problem” based on physical design requirements such as limits of size and weight. The operating strategy for generators must be considered when evaluating the goodness of the design. To this end, this paper develops a design approach to impose system-level controls onto generating plants to evaluate their optimality. Two critical design metrics-fuel consumption and quality of service (QOS) are defined to incorporate these control variables, and co-optimized to reflect mission-oriented system performance. The minimum fuel consumption is computed based on a new concept of economic dispatch algorithm, which takes active and reactive power balance, and system redundancy requirements into account. QOS metric is defined to reflect system-level control strategies based on the classical concept of mean-time-between-failure, which is defined to depend inversely on the power produced. We develop a multi-objective particle swarm optimization to effectively locate the Pareto fronts of system performance for all design alternatives over a whole given mission. Thus a set of optimal design alternatives can be rapidly selected to represent the non-dominated optimal compromises of the two metrics. This design approach is demonstrated and compared with a single-objective design approach in a design example of shipboard generating plant design. And more optimal alternatives are able to be found.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114958582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523706
N. Doerry, K. Moniri
The U.S. Navy has invested considerable funds in the research and development of electrical power technologies for future electric warships. One aspect of institutionalizing these technologies is the creation or modification of standards and specifications to incorporate the new technologies. This paper assesses the current state of standards and specifications in support of the design and construction of an all-electric naval warship. These technical documents will be evaluated in terms of the different power systems architectures to include low voltage ac generation, medium voltage ac generation, medium voltage dc generation, and zonal power distribution. Ongoing standards activity, both in industry and in the Navy, are discussed. Finally, the paper presents recommendations for updating existing specifications and standards and the creation of new specifications to cover technical areas where standards do not currently exist.
{"title":"Specifications and standards for the electric warship","authors":"N. Doerry, K. Moniri","doi":"10.1109/ESTS.2013.6523706","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523706","url":null,"abstract":"The U.S. Navy has invested considerable funds in the research and development of electrical power technologies for future electric warships. One aspect of institutionalizing these technologies is the creation or modification of standards and specifications to incorporate the new technologies. This paper assesses the current state of standards and specifications in support of the design and construction of an all-electric naval warship. These technical documents will be evaluated in terms of the different power systems architectures to include low voltage ac generation, medium voltage ac generation, medium voltage dc generation, and zonal power distribution. Ongoing standards activity, both in industry and in the Navy, are discussed. Finally, the paper presents recommendations for updating existing specifications and standards and the creation of new specifications to cover technical areas where standards do not currently exist.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115988122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523719
T. Dalton
New ship designs are required to validate their performance at sea trials to contractually it meets or exceeds its specified requirements. Two of the most important requirements to be contractually verified for a new ship design are its specified ship speed and rated shaft power of the propulsion system as installed in the ship. However, propulsion systems of new ship designs typically do not achieve their defined rated power at sea trials for various reasons unrelated to the propulsion system itself. The recent revival of electric propulsion systems aboard U.S. Navy ships has necessitated a refinement on how to define and achieve rated shaft power at sea trials because the established approach is based on mechanical propulsion systems rather than electric propulsion systems. This paper addresses the differences between electric and mechanical propulsion systems in defining and realistically achieving rated shaft power at sea trials for new ships. Accordingly, this paper reviews the U.S. Navy policy for establishing rated shaft power at sea trials and examines how these requirements now apply to ships with electric propulsion systems. The paper concludes with proposing an updated method to formally define and realistically achieve rated shaft power at sea trials via either DC or AC electric propulsion systems in full or partial configurations for new U.S. Navy ships.
{"title":"Defining and achieving rated shaft power in electric propulsion systems at sea trials for new U.S. Navy ships","authors":"T. Dalton","doi":"10.1109/ESTS.2013.6523719","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523719","url":null,"abstract":"New ship designs are required to validate their performance at sea trials to contractually it meets or exceeds its specified requirements. Two of the most important requirements to be contractually verified for a new ship design are its specified ship speed and rated shaft power of the propulsion system as installed in the ship. However, propulsion systems of new ship designs typically do not achieve their defined rated power at sea trials for various reasons unrelated to the propulsion system itself. The recent revival of electric propulsion systems aboard U.S. Navy ships has necessitated a refinement on how to define and achieve rated shaft power at sea trials because the established approach is based on mechanical propulsion systems rather than electric propulsion systems. This paper addresses the differences between electric and mechanical propulsion systems in defining and realistically achieving rated shaft power at sea trials for new ships. Accordingly, this paper reviews the U.S. Navy policy for establishing rated shaft power at sea trials and examines how these requirements now apply to ships with electric propulsion systems. The paper concludes with proposing an updated method to formally define and realistically achieve rated shaft power at sea trials via either DC or AC electric propulsion systems in full or partial configurations for new U.S. Navy ships.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123779003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-04-22DOI: 10.1109/ESTS.2013.6523736
F. W. Klatt
Choices for today's electric ship propulsion systems include the asynchronous (i.e., induction) singly-fed or doubly-fed electric machine systems or the synchronous singly-fed electric machine systems with permanent magnets or DC field-windings (e.g., superconductor). Experts theorized that the variable-speed Brushless Wound-rotor [Synchronous] Doubly-fed Electric Machine System (BWRSDF), which can symmetrically motor or generate, provides higher efficiency, higher power density, higher torque density, and lower cost than any other electric machine system but only with the discovery of a practical brushless real time control solution for its known issues of instability and the multiphase slip-ring assembly that continually elude state-of-art control methods, such as Field Oriented Control (FOC). Comprising a dual-ported transformer circuit topology with the robust characteristics common to the advanced induction electric machine system, such as field weakening, practically unconstrained torque and power rating, etc., the fully electromagnetic core of the BWRSDF uses readily available technology and materials without the cost, safety and reliability issues of market volatile, rare-earth permanent magnets. A patented with patents pending Brushless and Sensorless Real Time Control (BSRTC) method provides the only available BWRSDF.
{"title":"Brushless Wound-rotor [Synchronous] Doubly-fed Electric Machine stabilized by real-time control","authors":"F. W. Klatt","doi":"10.1109/ESTS.2013.6523736","DOIUrl":"https://doi.org/10.1109/ESTS.2013.6523736","url":null,"abstract":"Choices for today's electric ship propulsion systems include the asynchronous (i.e., induction) singly-fed or doubly-fed electric machine systems or the synchronous singly-fed electric machine systems with permanent magnets or DC field-windings (e.g., superconductor). Experts theorized that the variable-speed Brushless Wound-rotor [Synchronous] Doubly-fed Electric Machine System (BWRSDF), which can symmetrically motor or generate, provides higher efficiency, higher power density, higher torque density, and lower cost than any other electric machine system but only with the discovery of a practical brushless real time control solution for its known issues of instability and the multiphase slip-ring assembly that continually elude state-of-art control methods, such as Field Oriented Control (FOC). Comprising a dual-ported transformer circuit topology with the robust characteristics common to the advanced induction electric machine system, such as field weakening, practically unconstrained torque and power rating, etc., the fully electromagnetic core of the BWRSDF uses readily available technology and materials without the cost, safety and reliability issues of market volatile, rare-earth permanent magnets. A patented with patents pending Brushless and Sensorless Real Time Control (BSRTC) method provides the only available BWRSDF.","PeriodicalId":119318,"journal":{"name":"2013 IEEE Electric Ship Technologies Symposium (ESTS)","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128114338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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