The Experts below are selected from a list of 10362 Experts worldwide ranked by ideXlab platform
Robert D. Lorenz - One of the best experts on this subject based on the ideXlab platform.
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optimum dc bus Voltage analysis and calculation method for inverters motors with variable dc bus Voltage
European Conference on Cognitive Ergonomics, 2013Co-Authors: Jun Tamura, Robert D. LorenzAbstract:In this paper, an online method to calculate the optimum dc bus Voltage for motors and inverters with variable dc bus Voltages is proposed. The required dc bus Voltage in the low-speed region is much lower than that for the rated-speed region. As a result, the machine drive system efficiency can be improved with lower dc bus Voltage since the switching losses in the inverter are reduced. To achieve both desired machine output torque and minimized losses simultaneously, an optimum dc bus Voltage is required. However, machine parameter estimation errors and spatial harmonics in the machine result in calculation errors for the required dc bus Voltage. A Voltage Disturbance state filter (VDSF), which is formed by a Luenburger-style closed-loop stator current vector observer with Voltage command feedforward, is used to mitigate the calculation errors. Voltage errors caused by the parameter deviations and machine spatial harmonics will inherently be estimated by the observer's state feedback controller. Therefore, the calculation Voltage error can be corrected by the VDSF's Disturbance Voltage so that the optimum dc bus Voltage can be obtained.
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Control method for calculating optimum DC bus Voltage to improve drive system efficiency in variable DC bus drive systems
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012Co-Authors: Jun Tamura, Robert D. LorenzAbstract:In this paper, an online method to calculate the optimum DC bus Voltage in variable DC bus Voltage drive system is proposed. The required DC bus Voltage in the low speed region is much lower than for the rated speed region. As a result, the machine drive system efficiency can be improved with lower DC bus Voltage since the switching losses in the inverter are reduced. To achieve both desired machine output torque and minimized losses simultaneously, an optimum DC bus Voltage is required. However, machine parameter estimation errors and spatial harmonics in the machine result in calculation errors for the required DC bus Voltage. A Voltage Disturbance state filter (VDSF), which is formed by a Luenburger-style closed-loop stator current vector observer with Voltage command feedforward, is used to mitigate the calculation errors. Voltage errors caused by the parameter deviations and machine spatial harmonics will inherently be estimated by the observer's state feedback controller. Therefore, calculation Voltage error can be corrected by the VDSF's Disturbance Voltage, so that the optimum DC bus Voltage can be obtained.
Masoud Aliakbar Golkar - One of the best experts on this subject based on the ideXlab platform.
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Voltage control and active power management of hybrid fuel cell energy storage power conversion system under unbalanced Voltage sag conditions
IEEE Transactions on Energy Conversion, 2010Co-Authors: Amin Hajizadeh, Masoud Aliakbar Golkar, A FeliachiAbstract:This paper concentrates on the control of hybrid fuel-cell (FC)/energy-storage distributed generation (DG) systems under Voltage sag in distribution systems. The proposed control strategy makes hybrid DG system work properly when a Voltage Disturbance occurs in distribution system, and it stays connected to the main grid. To distribute the power between dc power sources and stabilize the dc-link power, a Lyapunov-based neuro-fuzzy control strategy has been developed. This controller determines the supercapacitor power that should be generated according to the amount of available energy in dc-link. Also, current control strategies for the FC converter (boost) and supercapacitor converter (buck-boost converter) are designed by proportional-integral and sliding-mode control consequently. Moreover, a complementary control strategy for Voltage source converter based on positive and negative symmetrical components is presented to investigate the Voltage sag ride-through and Voltage control capability. The hybrid system is studied under unbalance Voltage sag condition. Simulation results are given to show the overall system performance including active power control and Voltage sag ride-through capability of the hybrid DG system.
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control of hybrid fuel cell energy storage distributed generation system against Voltage sag
International Journal of Electrical Power & Energy Systems, 2010Co-Authors: Amin Hajizadeh, Masoud Aliakbar GolkarAbstract:Fuel cell (FC) and energy storage (ES) based hybrid distributed power generation systems appear to be very promising for satisfying high energy and high power requirements of power quality problems in distributed generation (DG) systems. In this study, design of control strategy for hybrid fuel cell/energy storage distributed power generation system during Voltage sag has been presented. The proposed control strategy allows hybrid distributed generation system works properly when a Voltage Disturbance occurs in distribution system and hybrid system stays connected to the main grid. Hence, modeling, controller design, and simulation study of a hybrid distributed generation system are investigated. The physical model of the fuel cell stack, energy storage and the models of power conditioning units are described. Then the control design methodology for each component of the hybrid system is proposed. Simulation results are given to show the overall system performance including active power control and Voltage sag ride-through capability of the hybrid distributed generation system.
Amin Hajizadeh - One of the best experts on this subject based on the ideXlab platform.
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Voltage control and active power management of hybrid fuel cell energy storage power conversion system under unbalanced Voltage sag conditions
IEEE Transactions on Energy Conversion, 2010Co-Authors: Amin Hajizadeh, Masoud Aliakbar Golkar, A FeliachiAbstract:This paper concentrates on the control of hybrid fuel-cell (FC)/energy-storage distributed generation (DG) systems under Voltage sag in distribution systems. The proposed control strategy makes hybrid DG system work properly when a Voltage Disturbance occurs in distribution system, and it stays connected to the main grid. To distribute the power between dc power sources and stabilize the dc-link power, a Lyapunov-based neuro-fuzzy control strategy has been developed. This controller determines the supercapacitor power that should be generated according to the amount of available energy in dc-link. Also, current control strategies for the FC converter (boost) and supercapacitor converter (buck-boost converter) are designed by proportional-integral and sliding-mode control consequently. Moreover, a complementary control strategy for Voltage source converter based on positive and negative symmetrical components is presented to investigate the Voltage sag ride-through and Voltage control capability. The hybrid system is studied under unbalance Voltage sag condition. Simulation results are given to show the overall system performance including active power control and Voltage sag ride-through capability of the hybrid DG system.
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control of hybrid fuel cell energy storage distributed generation system against Voltage sag
International Journal of Electrical Power & Energy Systems, 2010Co-Authors: Amin Hajizadeh, Masoud Aliakbar GolkarAbstract:Fuel cell (FC) and energy storage (ES) based hybrid distributed power generation systems appear to be very promising for satisfying high energy and high power requirements of power quality problems in distributed generation (DG) systems. In this study, design of control strategy for hybrid fuel cell/energy storage distributed power generation system during Voltage sag has been presented. The proposed control strategy allows hybrid distributed generation system works properly when a Voltage Disturbance occurs in distribution system and hybrid system stays connected to the main grid. Hence, modeling, controller design, and simulation study of a hybrid distributed generation system are investigated. The physical model of the fuel cell stack, energy storage and the models of power conditioning units are described. Then the control design methodology for each component of the hybrid system is proposed. Simulation results are given to show the overall system performance including active power control and Voltage sag ride-through capability of the hybrid distributed generation system.
Jun Tamura - One of the best experts on this subject based on the ideXlab platform.
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optimum dc bus Voltage analysis and calculation method for inverters motors with variable dc bus Voltage
European Conference on Cognitive Ergonomics, 2013Co-Authors: Jun Tamura, Robert D. LorenzAbstract:In this paper, an online method to calculate the optimum dc bus Voltage for motors and inverters with variable dc bus Voltages is proposed. The required dc bus Voltage in the low-speed region is much lower than that for the rated-speed region. As a result, the machine drive system efficiency can be improved with lower dc bus Voltage since the switching losses in the inverter are reduced. To achieve both desired machine output torque and minimized losses simultaneously, an optimum dc bus Voltage is required. However, machine parameter estimation errors and spatial harmonics in the machine result in calculation errors for the required dc bus Voltage. A Voltage Disturbance state filter (VDSF), which is formed by a Luenburger-style closed-loop stator current vector observer with Voltage command feedforward, is used to mitigate the calculation errors. Voltage errors caused by the parameter deviations and machine spatial harmonics will inherently be estimated by the observer's state feedback controller. Therefore, the calculation Voltage error can be corrected by the VDSF's Disturbance Voltage so that the optimum dc bus Voltage can be obtained.
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Control method for calculating optimum DC bus Voltage to improve drive system efficiency in variable DC bus drive systems
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012Co-Authors: Jun Tamura, Robert D. LorenzAbstract:In this paper, an online method to calculate the optimum DC bus Voltage in variable DC bus Voltage drive system is proposed. The required DC bus Voltage in the low speed region is much lower than for the rated speed region. As a result, the machine drive system efficiency can be improved with lower DC bus Voltage since the switching losses in the inverter are reduced. To achieve both desired machine output torque and minimized losses simultaneously, an optimum DC bus Voltage is required. However, machine parameter estimation errors and spatial harmonics in the machine result in calculation errors for the required DC bus Voltage. A Voltage Disturbance state filter (VDSF), which is formed by a Luenburger-style closed-loop stator current vector observer with Voltage command feedforward, is used to mitigate the calculation errors. Voltage errors caused by the parameter deviations and machine spatial harmonics will inherently be estimated by the observer's state feedback controller. Therefore, calculation Voltage error can be corrected by the VDSF's Disturbance Voltage, so that the optimum DC bus Voltage can be obtained.
Osama A Mohammed - One of the best experts on this subject based on the ideXlab platform.
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dc bus Voltage control technique for parallel integrated permanent magnet wind generation systems
Power and Energy Society General Meeting, 2012Co-Authors: Mahmoud Amin, Osama A MohammedAbstract:Summary form only given. This paper presents a dc-bus Voltage control technique for a new power conversion topology feasible for parallel-integrated permanent magnet wind generation systems. This technique is based on a master-slave hysteresis control scheme in order to solve discrepancy problems that could happen between the controllers. A three-phase semi-controlled rectifier topology is proposed here as an effective interface circuit between each wind generator and the dc-bus. The proposed system provides interconnection extension ability of multi wind converter units sharing the same dc-bus and more economic utilization of the wind generator; by insuring unity power factor operation. More advantages include Voltage Disturbance compensation capability, robustness; since a short circuit through a leg is not possible and high efficiency; due to the reduced number of switching elements. The rectifier topology concept, the principle of operation, the control scheme and test results are presented. The developed technique is also implemented on a 12 kW parallel-connected permanent magnet laboratory setup in order to confirm the effectiveness of the proposed system.
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dc bus Voltage control technique for parallel integrated permanent magnet wind generation systems
IEEE Transactions on Energy Conversion, 2011Co-Authors: Mahmoud Amin, Osama A MohammedAbstract:This paper presents a dc-bus Voltage control technique for a new power conversion topology feasible for parallel-integrated permanent magnet (PM) wind generation systems. This technique is based on a master-slave hysteresis control scheme in order to solve discrepancy problems that could happen between the controllers. A three-phase semicontrolled rectifier topology is proposed here as an effective interface circuit between each wind generator and the dc-bus. The proposed system provides interconnection extension ability of multiwind converter units sharing the same dc-bus and more economic utilization of the wind generator; by ensuring unity power factor operation. More advantages include Voltage Disturbance compensation capability, robustness: since a short circuit through a leg is not possible and high efficiency: due to the reduced number of switching elements. The rectifier topology concept, the principle of operation, the control scheme, and test results are presented. The developed technique is also implemented on a 12 kW parallel-connected PM laboratory setup in order to confirm the effectiveness of the proposed system.
