The Experts below are selected from a list of 216 Experts worldwide ranked by ideXlab platform
Eric M Clementoni - One of the best experts on this subject based on the ideXlab platform.
-
Transient Power Operation of a Supercritical Carbon Dioxide Brayton Cycle
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2017Co-Authors: Eric M Clementoni, Martha A King, Timothy L. Cox, Kevin D. RahnerAbstract:The Naval Nuclear Laboratory has been operating the Integrated System Test (IST) with the objective of demonstrating the ability to operate and control a supercritical carbon dioxide (sCO2) Brayton power cycle over a wide range of conditions. The IST is a two shaft recuperated closed sCO2 Brayton cycle with a variable speed Turbine-driven compressor and a constant speed Turbine-driven generator designed to output 100 kWe. This paper presents a thermal-hydraulic lead control strategy for operation of the cycle over a range of operating conditions along with predicted and actual IST system response to power level changes using this control strategy.
-
Steady-State Power Operation of a Supercritical Carbon Dioxide Brayton Cycle With Thermal-Hydraulic Control
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2016Co-Authors: Eric M Clementoni, Timothy L. Cox, Martha A KingAbstract:The Bechtel Marine Propulsion Corporation (BMPC) Integrated System Test (IST) is a two shaft recuperated closed Brayton cycle using supercritical carbon dioxide (sCO2) as the working fluid. The IST is a simple recuperated Brayton cycle with a variable speed Turbine driven compressor and a constant speed Turbine driven generator designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an sCO2 Brayton power cycle over a wide range of conditions. IST operation has reached the point where the system can be run with the Turbine-compressor thermal-hydraulically balanced so that the net power of the cycle is equal to the Turbine-generator output. In this operating mode, power level is changed by using the compressor recirculation valve to adjust the fraction of compressor flow that goes to the Turbines as well as the compressor pressure ratio. Steady-state operational data and trends are presented at various system power levels from near zero net cycle power to maximum operating power using a simplified thermal-hydraulic based control method. Confirmation of stable steady-state operation of the system with automatic thermal-hydraulic control is also discussed.
-
Steady-State Power Operation of a Supercritical Carbon Dioxide Brayton Cycle
2016Co-Authors: Eric M Clementoni, Timothy L. CoxAbstract:Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The Integrated System Test (IST) is a two shaft recuperated closed Brayton cycle with a variable speed Turbine drive compressor and a constant speed Turbine driven generator using S-CO2 as the working fluid designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. IST operation has been limited in power level due to issues with the permanent magnet rotor and motor-generator controller for the Turbine-generator. Remagnetization of the rotor along with motor-generator controller improvements have increased the power output capability of the generator to at least 40 kWe. Steady-state operation at various power levels from near zero net system power to maximum operating power of 40 kWe is presented
-
off nominal component performance in a supercritical carbon dioxide brayton cycle
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2015Co-Authors: Eric M Clementoni, Martha A KingAbstract:Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The Integrated System Test (IST) is a simple recuperated closed Brayton cycle with a Variable-Speed Turbine-driven compressor and a constant-speed Turbine-driven generator using S-CO2 as the working fluid designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. Therefore, the IST was designed to operate in a configuration and at conditions that support demonstrating the controllability of the closed S-CO2 Brayton cycle. Operating at high system efficiency and meeting a specified efficiency target are not requirements of the IST. However, efficiency is a primary driver for many commercial applications of S-CO2 power cycles. This paper uses operational data to evaluate component off-nominal performance and predict that design system operation would be achievable.Copyright © 2015 by ASME
-
Off-Nominal Component Performance in a Supercritical Carbon Dioxide Brayton Cycle
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2015Co-Authors: Eric M Clementoni, Timothy L. Cox, Martha A KingAbstract:Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The Integrated System Test (IST) is a simple recuperated closed Brayton cycle with a Variable-Speed Turbine-driven compressor and a constant-speed Turbine-driven generator using S-CO2 as the working fluid designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. Therefore, the IST was designed to operate in a configuration and at conditions that support demonstrating the controllability of the closed S-CO2 Brayton cycle. Operating at high system efficiency and meeting a specified efficiency target are not requirements of the IST. However, efficiency is a primary driver for many commercial applications of S-CO2 power cycles. This paper uses operational data to evaluate component off-nominal performance and predict that design system operation would be achievable.
Timothy L. Cox - One of the best experts on this subject based on the ideXlab platform.
-
Transient Power Operation of a Supercritical Carbon Dioxide Brayton Cycle
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2017Co-Authors: Eric M Clementoni, Martha A King, Timothy L. Cox, Kevin D. RahnerAbstract:The Naval Nuclear Laboratory has been operating the Integrated System Test (IST) with the objective of demonstrating the ability to operate and control a supercritical carbon dioxide (sCO2) Brayton power cycle over a wide range of conditions. The IST is a two shaft recuperated closed sCO2 Brayton cycle with a variable speed Turbine-driven compressor and a constant speed Turbine-driven generator designed to output 100 kWe. This paper presents a thermal-hydraulic lead control strategy for operation of the cycle over a range of operating conditions along with predicted and actual IST system response to power level changes using this control strategy.
-
Steady-State Power Operation of a Supercritical Carbon Dioxide Brayton Cycle With Thermal-Hydraulic Control
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2016Co-Authors: Eric M Clementoni, Timothy L. Cox, Martha A KingAbstract:The Bechtel Marine Propulsion Corporation (BMPC) Integrated System Test (IST) is a two shaft recuperated closed Brayton cycle using supercritical carbon dioxide (sCO2) as the working fluid. The IST is a simple recuperated Brayton cycle with a variable speed Turbine driven compressor and a constant speed Turbine driven generator designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an sCO2 Brayton power cycle over a wide range of conditions. IST operation has reached the point where the system can be run with the Turbine-compressor thermal-hydraulically balanced so that the net power of the cycle is equal to the Turbine-generator output. In this operating mode, power level is changed by using the compressor recirculation valve to adjust the fraction of compressor flow that goes to the Turbines as well as the compressor pressure ratio. Steady-state operational data and trends are presented at various system power levels from near zero net cycle power to maximum operating power using a simplified thermal-hydraulic based control method. Confirmation of stable steady-state operation of the system with automatic thermal-hydraulic control is also discussed.
-
Steady-State Power Operation of a Supercritical Carbon Dioxide Brayton Cycle
2016Co-Authors: Eric M Clementoni, Timothy L. CoxAbstract:Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The Integrated System Test (IST) is a two shaft recuperated closed Brayton cycle with a variable speed Turbine drive compressor and a constant speed Turbine driven generator using S-CO2 as the working fluid designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. IST operation has been limited in power level due to issues with the permanent magnet rotor and motor-generator controller for the Turbine-generator. Remagnetization of the rotor along with motor-generator controller improvements have increased the power output capability of the generator to at least 40 kWe. Steady-state operation at various power levels from near zero net system power to maximum operating power of 40 kWe is presented
-
Off-Nominal Component Performance in a Supercritical Carbon Dioxide Brayton Cycle
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2015Co-Authors: Eric M Clementoni, Timothy L. Cox, Martha A KingAbstract:Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The Integrated System Test (IST) is a simple recuperated closed Brayton cycle with a Variable-Speed Turbine-driven compressor and a constant-speed Turbine-driven generator using S-CO2 as the working fluid designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. Therefore, the IST was designed to operate in a configuration and at conditions that support demonstrating the controllability of the closed S-CO2 Brayton cycle. Operating at high system efficiency and meeting a specified efficiency target are not requirements of the IST. However, efficiency is a primary driver for many commercial applications of S-CO2 power cycles. This paper uses operational data to evaluate component off-nominal performance and predict that design system operation would be achievable.
-
startup and operation of a supercritical carbon dioxide brayton cycle
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2014Co-Authors: Eric M Clementoni, Timothy L. Cox, Christopher P SpragueAbstract:Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The 100 kWe integrated system test (IST) is a two shaft recuperated closed Brayton cycle with a variable speed Turbine driven compressor and a constant speed Turbine driven generator using S-CO2 as the working fluid. The IST was designed to demonstrate operational, control, and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. Initial operation of the IST has proven a reliable method for startup of the Brayton loop and heatup to normal operating temperature (570 °F). An overview of the startup process, including initial loop fill and charging, and heatup to normal operating temperature is presented. Additionally, aspects of the IST startup process which are related to the loop size and component design which may be different for larger systems are discussed.
Djamila Rekioua - One of the best experts on this subject based on the ideXlab platform.
-
High performance of Maximum Power Point Tracking Using Ant Colony algorithm in wind Turbine
Renewable Energy, 2018Co-Authors: Yacine Mokhtari, Djamila RekiouaAbstract:Abstract The growing interest in wind power as a source of electric power generation with minimal environmental impact and the advancement of aerodynamic designs, including wind Turbines, have been the subject of numerous studies. When wind energy is integrated into the grid, this gives a significant amount of power added to the one produced by other types of plants. Several researchers aim to achieve high efficiency in wind power systems using maximum power point tracking (MPPT) of a Variable-Speed Turbine but this technique is complicated because the different approximations that occur during the online calculations. The main objective of this work is to develop and improve a maximum power tracking control strategy using metaheuristic methods. Ant colony optimization (ACO) algorithm is used to determine the optimal PI controller parameters for speed control. The optimization of the speed gets a better value of power coefficient therefore the extracting power.
-
Robust nonlinear predictive control of permanent magnet synchronous generator Turbine using Dspace hardware
International Journal of Hydrogen Energy, 2016Co-Authors: Riad Aissou, Djamila Rekioua, Toufik Rekioua, Abdelmounaïm TounziAbstract:Abstract In this paper, a robust nonlinear predictive control (NLPC) is applied to a wind energy conversion system, using a variable speed Turbine coupled directly to permanent magnet synchronous generator (PMSG) with PWM rectifier and a load. The principle of this control consists in elaborating a control law such that the predicted output can optimally track a desired predicted reference in presence of the disturbance. The predictive control will be optimal if the finite horizon cost function is minimized. The purpose of control in our case is to adjust the rectifier voltage amplitude and the stator current of the PMSG even with the change in wind speed. This control has-been Implemented using Dspace DS1104 card, the latter allowed us to control the system in real time. Finally, the practical results and those obtained by simulation using MATLAB/Simulink are compared to illustrate the performances of the proposed control regarding tracking of the reference and the disturbance rejection.
Martha A King - One of the best experts on this subject based on the ideXlab platform.
-
Transient Power Operation of a Supercritical Carbon Dioxide Brayton Cycle
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2017Co-Authors: Eric M Clementoni, Martha A King, Timothy L. Cox, Kevin D. RahnerAbstract:The Naval Nuclear Laboratory has been operating the Integrated System Test (IST) with the objective of demonstrating the ability to operate and control a supercritical carbon dioxide (sCO2) Brayton power cycle over a wide range of conditions. The IST is a two shaft recuperated closed sCO2 Brayton cycle with a variable speed Turbine-driven compressor and a constant speed Turbine-driven generator designed to output 100 kWe. This paper presents a thermal-hydraulic lead control strategy for operation of the cycle over a range of operating conditions along with predicted and actual IST system response to power level changes using this control strategy.
-
Steady-State Power Operation of a Supercritical Carbon Dioxide Brayton Cycle With Thermal-Hydraulic Control
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2016Co-Authors: Eric M Clementoni, Timothy L. Cox, Martha A KingAbstract:The Bechtel Marine Propulsion Corporation (BMPC) Integrated System Test (IST) is a two shaft recuperated closed Brayton cycle using supercritical carbon dioxide (sCO2) as the working fluid. The IST is a simple recuperated Brayton cycle with a variable speed Turbine driven compressor and a constant speed Turbine driven generator designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an sCO2 Brayton power cycle over a wide range of conditions. IST operation has reached the point where the system can be run with the Turbine-compressor thermal-hydraulically balanced so that the net power of the cycle is equal to the Turbine-generator output. In this operating mode, power level is changed by using the compressor recirculation valve to adjust the fraction of compressor flow that goes to the Turbines as well as the compressor pressure ratio. Steady-state operational data and trends are presented at various system power levels from near zero net cycle power to maximum operating power using a simplified thermal-hydraulic based control method. Confirmation of stable steady-state operation of the system with automatic thermal-hydraulic control is also discussed.
-
off nominal component performance in a supercritical carbon dioxide brayton cycle
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2015Co-Authors: Eric M Clementoni, Martha A KingAbstract:Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The Integrated System Test (IST) is a simple recuperated closed Brayton cycle with a Variable-Speed Turbine-driven compressor and a constant-speed Turbine-driven generator using S-CO2 as the working fluid designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. Therefore, the IST was designed to operate in a configuration and at conditions that support demonstrating the controllability of the closed S-CO2 Brayton cycle. Operating at high system efficiency and meeting a specified efficiency target are not requirements of the IST. However, efficiency is a primary driver for many commercial applications of S-CO2 power cycles. This paper uses operational data to evaluate component off-nominal performance and predict that design system operation would be achievable.Copyright © 2015 by ASME
-
Off-Nominal Component Performance in a Supercritical Carbon Dioxide Brayton Cycle
Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy, 2015Co-Authors: Eric M Clementoni, Timothy L. Cox, Martha A KingAbstract:Bechtel Marine Propulsion Corporation (BMPC) is testing a supercritical carbon dioxide (S-CO2) Brayton system at the Bettis Atomic Power Laboratory. The Integrated System Test (IST) is a simple recuperated closed Brayton cycle with a Variable-Speed Turbine-driven compressor and a constant-speed Turbine-driven generator using S-CO2 as the working fluid designed to output 100 kWe. The main focus of the IST is to demonstrate operational, control, and performance characteristics of an S-CO2 Brayton power cycle over a wide range of conditions. Therefore, the IST was designed to operate in a configuration and at conditions that support demonstrating the controllability of the closed S-CO2 Brayton cycle. Operating at high system efficiency and meeting a specified efficiency target are not requirements of the IST. However, efficiency is a primary driver for many commercial applications of S-CO2 power cycles. This paper uses operational data to evaluate component off-nominal performance and predict that design system operation would be achievable.
V. M. F. Mendes - One of the best experts on this subject based on the ideXlab platform.
-
HVDC Power transmission simulation for offshore wind system with three-level converter
2016 IEEE International Power Electronics and Motion Control Conference (PEMC), 2016Co-Authors: R. Melício, V. M. F. Mendes, M. SeixasAbstract:An integrated mathematical model for the simulation of an offshore wind system performance is presented in this paper. The mathematical model considers an offshore Variable-Speed Turbine in deep water equipped with a permanent magnet synchronous generator using multiple point full-power clamped three-level converter, converting the energy of a variable frequency source in injected energy into the electric network with constant frequency, through a HVDC transmission submarine cable. The mathematical model for the drive train is a concentrate two mass model which incorporates the dynamic for the blades of the wind Turbine, tower and generator due to the need to emulate the effects of the wind and the floating motion. Controller strategy considered is a proportional integral one. Also, pulse width modulation using space vector modulation supplemented with sliding mode is used for trigger the transistors of the converter. Finally, a case study is presented to access the system performance.
-
Simulation of OWES with five-level converter linked to the grid: Harmonic assessment
2015 9th International Conference on Compatibility and Power Electronics (CPE), 2015Co-Authors: M. Seixas, R. Melício, V. M. F. Mendes, Carlos CoutoAbstract:This paper deals with a computing simulation for an offshore wind energy system taking into account the influence of the marine waves action throughout the floating platform. The wind energy system has a Variable-Speed Turbine equipped with a permanent magnet synchronous generator and a full-power fivelevel converter, injecting energy into the electric grid through a high voltage alternate current link. A reduction on the unbalance of the voltage in the DC-link capacitors of the five-level converter is proposed by a strategic selection of the output voltage vectors. The model for the drive train of the wind energy system is a two mass model, including the dynamics of the floating platform. A case study is presented and the assessment of the quality of the energy injected into the electric grid is discussed.
-
Simulation of offshore wind system with two-level converters: HVDC power transmission
2014 16th International Power Electronics and Motion Control Conference and Exposition, 2014Co-Authors: R. Melício, V. M. F. Mendes, H. M. I. PousinhoAbstract:A new integrated mathematical model for the simulation of offshore wind energy conversion system performance is presented in this paper. The mathematical model considers an offshore Variable-Speed Turbine in deep water equipped with a permanent magnet synchronous generator using full-power two-level converter, converting the energy of a variable frequency source in injected energy into the electric network with constant frequency, through a high voltage DC transmission submarine cable. The mathematical model for the drive train is a concentrate two mass model which incorporates the dynamic for the structure and tower due to the need to emulate the effects of the moving surface. Controller strategy considered is a proportional integral one. Also, pulse width modulation using space vector modulation supplemented with sliding mode is used for trigger the transistor of the converter. Finally, a case study is presented to access the system performance.
