The Experts below are selected from a list of 33543 Experts worldwide ranked by ideXlab platform
Giri Venkataramanan - One of the best experts on this subject based on the ideXlab platform.
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Unbalanced voltage sag ride-through of a doubly fed induction generator wind turbine with series Grid-Side Converter
IEEE Transactions on Industry Applications, 2009Co-Authors: Patrick S. Flannery, Giri VenkataramananAbstract:Regulatory standards for grid interconnection require wind generators to ride through disturbances such as faults and support the grid during such events. Conventional accommodations for providing voltage sag ride-through for doubly fed induction generator (DFIG) wind turbines result in compromised control of the turbine shaft and grid current during unbalanced faults. This paper presents the analysis and control design of a DFIG wind turbine with a series Grid-Side Converter for ride-through during unbalanced voltage sag events. A dynamic model and control structure is developed for unbalanced operating conditions. Experimental results from 2-kW laboratory hardware are used to verify the proposed concepts. Hardware results illustrate an excellent ride-through response of the DFIG system under various sag conditions.
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unbalanced voltage sag ride through of a doubly fed induction generator wind turbine with series grid side Converter
IEEE Industry Applications Society Annual Meeting, 2008Co-Authors: Patrick S. Flannery, Giri VenkataramananAbstract:Regulatory standards for grid interconnection require wind generators ride-through disturbances such as faults and support the grid during such events. Conventional accommodations for providing voltage sag ride-through for doubly fed induction generator (DFIG) wind turbines result in compromised control of the turbine shaft and grid current during unbalanced faults. This paper presents analysis and control design of a DFIG wind turbine with series grid side Converter for ride through during unbalanced voltage sag events. A dynamic model and control structure is developed for unbalanced operating conditions. Experimental results from 2kW laboratory hardware are used to verify the proposed concepts. Hardware results illustrate excellent ride through response of the DFIG system under various sag conditions.
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A fault tolerant doubly fed induction generator wind turbine using a parallel grid side rectifier and series grid side Converter
IEEE Transactions on Power Electronics, 2008Co-Authors: Patrick S. Flannery, Giri VenkataramananAbstract:With steadily increasing wind turbine penetration, regulatory standards for grid interconnection have evolved to require that wind generation systems ride-through disturbances such as faults and support the grid during such events. Conventional modifications to the doubly fed induction generation (DFIG) architecture for providing ride-through result in compromised control of the turbine shaft and grid current during fault events. A DFIG architecture in which the grid side Converter is connected in series as opposed to parallel with the grid connection has shown improved low voltage ride through but poor power processing capabilities. In this paper, a unified DFIG wind turbine architecture which employs a parallel grid side rectifier and series grid side Converter is presented. The combination of these two Converters enables unencumbered power processing and robust voltage disturbance ride through. A dynamic model and control structure for this architecture is developed. The operation of the system is illustrated using computer simulations.
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evaluation of voltage sag ride through of a doubly fed induction generator wind turbine with series grid side Converter
Power Electronics Specialists Conference, 2007Co-Authors: Patrick S. Flannery, Giri VenkataramananAbstract:With steadily increasing wind turbine penetration, regulatory standards for grid interconnection have evolved to require that wind generation systems ride- through disturbances such as faults and support the grid during such events. Conventional ride-through accommodations result in high currents and torque or are unable to ride-through down to zero volts. This paper explores two DFIG configurations in which a series grid side Converter (SGSC) is employed exclusively for voltage sag ride-through. A control strategy applicable to both configurations is developed whereby the SGSC engages to stabilize the stator flux at the beginning and resolution of the sag event. Simulation results show excellent zero voltage ride-through response.
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A Unified Architecture for Doubly Fed Induction Generator Wind Turbines using a Parallel Grid Side Rectifier and Series Grid Side Converter
2007 Power Conversion Conference - Nagoya, 2007Co-Authors: P. Flannery, Giri VenkataramananAbstract:With steadily increasing wind turbine penetration, regulatory standards for grid interconnection have evolved to require that wind generation systems ride-through disturbances such as faults and support the grid during such events. Conventional modifications to the doubly fed induction generation (DFIG) architecture for providing ride-through result in limited control of the turbine shaft and grid current during fault events. A DFIG architecture in which the grid side Converter is connected in series as opposed to parallel with the grid connection has shown improved low voltage ride through but poor power processing capabilities. In this paper a unified DFIG wind turbine architecture which employs a parallel grid side rectifier and series grid side Converter is presented. The combination of these two Converters enables unencumbered power processing and robust voltage disturbance ride through. A dynamic model and control structure for this unified architecture is developed. The operation of the system is illustrated using computer simulations.
Patrick S. Flannery - One of the best experts on this subject based on the ideXlab platform.
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Unbalanced voltage sag ride-through of a doubly fed induction generator wind turbine with series Grid-Side Converter
IEEE Transactions on Industry Applications, 2009Co-Authors: Patrick S. Flannery, Giri VenkataramananAbstract:Regulatory standards for grid interconnection require wind generators to ride through disturbances such as faults and support the grid during such events. Conventional accommodations for providing voltage sag ride-through for doubly fed induction generator (DFIG) wind turbines result in compromised control of the turbine shaft and grid current during unbalanced faults. This paper presents the analysis and control design of a DFIG wind turbine with a series Grid-Side Converter for ride-through during unbalanced voltage sag events. A dynamic model and control structure is developed for unbalanced operating conditions. Experimental results from 2-kW laboratory hardware are used to verify the proposed concepts. Hardware results illustrate an excellent ride-through response of the DFIG system under various sag conditions.
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unbalanced voltage sag ride through of a doubly fed induction generator wind turbine with series grid side Converter
IEEE Industry Applications Society Annual Meeting, 2008Co-Authors: Patrick S. Flannery, Giri VenkataramananAbstract:Regulatory standards for grid interconnection require wind generators ride-through disturbances such as faults and support the grid during such events. Conventional accommodations for providing voltage sag ride-through for doubly fed induction generator (DFIG) wind turbines result in compromised control of the turbine shaft and grid current during unbalanced faults. This paper presents analysis and control design of a DFIG wind turbine with series grid side Converter for ride through during unbalanced voltage sag events. A dynamic model and control structure is developed for unbalanced operating conditions. Experimental results from 2kW laboratory hardware are used to verify the proposed concepts. Hardware results illustrate excellent ride through response of the DFIG system under various sag conditions.
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A fault tolerant doubly fed induction generator wind turbine using a parallel grid side rectifier and series grid side Converter
IEEE Transactions on Power Electronics, 2008Co-Authors: Patrick S. Flannery, Giri VenkataramananAbstract:With steadily increasing wind turbine penetration, regulatory standards for grid interconnection have evolved to require that wind generation systems ride-through disturbances such as faults and support the grid during such events. Conventional modifications to the doubly fed induction generation (DFIG) architecture for providing ride-through result in compromised control of the turbine shaft and grid current during fault events. A DFIG architecture in which the grid side Converter is connected in series as opposed to parallel with the grid connection has shown improved low voltage ride through but poor power processing capabilities. In this paper, a unified DFIG wind turbine architecture which employs a parallel grid side rectifier and series grid side Converter is presented. The combination of these two Converters enables unencumbered power processing and robust voltage disturbance ride through. A dynamic model and control structure for this architecture is developed. The operation of the system is illustrated using computer simulations.
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evaluation of voltage sag ride through of a doubly fed induction generator wind turbine with series grid side Converter
Power Electronics Specialists Conference, 2007Co-Authors: Patrick S. Flannery, Giri VenkataramananAbstract:With steadily increasing wind turbine penetration, regulatory standards for grid interconnection have evolved to require that wind generation systems ride- through disturbances such as faults and support the grid during such events. Conventional ride-through accommodations result in high currents and torque or are unable to ride-through down to zero volts. This paper explores two DFIG configurations in which a series grid side Converter (SGSC) is employed exclusively for voltage sag ride-through. A control strategy applicable to both configurations is developed whereby the SGSC engages to stabilize the stator flux at the beginning and resolution of the sag event. Simulation results show excellent zero voltage ride-through response.
Yong Liao - One of the best experts on this subject based on the ideXlab platform.
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enhanced control of a dfig based wind power generation system with series grid side Converter under unbalanced grid voltage conditions
IEEE Transactions on Power Electronics, 2013Co-Authors: Hui Li, Zhe Chen, Xiyin Chen, Qing Li, Yong LiaoAbstract:This paper presents an enhanced control method for a doubly fed induction generator (DFIG)-based wind-power generation system with series Grid-Side Converter (SGSC) under unbalanced grid voltage conditions. The behaviors of the DFIG system with SGSC during network unbalance are described. By injecting a series control voltage generated from the SGSC to balance the stator voltage, the adverse effects of voltage unbalance upon the DFIG, such as stator and rotor current unbalances, electromagnetic torque, and power pulsations, can be removed, and then the conventional vector control strategy for the rotor-side Converter remains in full force under unbalanced conditions. Meanwhile, three control targets for the parallel Grid-Side Converter (PGSC) are identified, including eliminating the oscillations in the total active power or reactive power, or eliminating negative-sequence current injected to the grid. Furthermore, a precise current reference generation strategy for the PGSC has been proposed for the PGSC to further improve the operation performance of the whole system. Finally, the proposed coordinated control strategy for the DFIG system with SGSC has been validated by the simulation results of a 2-MW-DFIG-based wind turbine with SGSC and experimental results on a laboratory-scale experimental rig under small steady-state grid voltage unbalance.
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method for outputting active power by using smoothing permanent magnet direct driving wind power generating system of direct current side flywheel energy storage unit
2012Co-Authors: Yao Jun, Xiyin Chen, Yong Liao, Qian Xiong, Xianfeng XiaAbstract:The invention discloses a method for outputting active power by using a smoothing permanent-magnet direct-driving wind power generating system of a direct-current-side flywheel energy storage unit. The method comprises the following steps of: controlling a motor-side Converter; controlling a Grid-Side Converter; and controlling an energy-storage-unit-side Converter. By cooperated control of the motor-side Converter, the Grid-Side Converter and the energy-storage-unit-side Converter, a wind power generator set can generate relatively-smoothed active output in the situation of change of a wind speed, and operating requirements of frequency modulation and voltage regulation of the system are met. The method has the advantages that: 1, based on the requirement of power smoothing control, maximum wind energy tracking control is realized; and 2, the network-side active power is smoothed, the quality of electric energy is improved, and the grid-connected operating characteristic of the wind power generating system is improved.
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operation and control of a grid connected dfig based wind turbine with series grid side Converter during network unbalance
Electric Power Systems Research, 2011Co-Authors: Yong Liao, Hui Li, Kai ZhuangAbstract:Abstract This paper proposes a control scheme of a grid-connected doubly-fed induction generator (DFIG) wind turbine with series Grid-Side Converter (SGSC) to improve the control and operation performance of DFIG system during network unbalance. The behaviors of DFIG system with SGSC under unbalanced grid voltage conditions are described. The SGSC is controlled to inject voltage in series to balance the stator voltage. Therefore, the adverse effects of voltage unbalance upon the DFIG such as large stator and rotor current unbalances, electromagnetic torque and power pulsations are removed and the conventional vector control strategy for the rotor-side Converter (RSC) remains in full force under unbalanced conditions. Meanwhile, three selective control targets for the parallel Grid-Side Converter (PGSC), such as eliminating the oscillations in total active or reactive power, or no negative-sequence current injected to the grid are identified and compared. Besides, the proportional resonant controllers in the stationary reference frame are designed for both the SGSC and PGSC to further improve the dynamic performance of the whole system. Finally, the ratings and losses of the SGSC and the injected transformer are discussed and the effectiveness of the proposed control scheme is verified by the simulation results of a 2 MW DFIG-based wind turbine with SGSC under steady state and small transient grid voltage unbalance.
Fengling Han - One of the best experts on this subject based on the ideXlab platform.
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Integral-Type Terminal Sliding-Mode Control for Grid-Side Converter in Wind Energy Conversion Systems
IEEE Transactions on Industrial Electronics, 2019Co-Authors: Xuemei Zheng, Yong Feng, Fengling HanAbstract:This paper investigates robust control strategies for wind energy conversion systems with variable-speed permanent magnet synchronous generators, which are integrated into the grid to provide reliable, secure, and efficient electrical power. A three-phase Grid-Side Converter without a grid transformer is connected to the grid using an LCL filter with low resistive losses. In these working conditions, an instantaneous power proportional integral (PI) controller for the outer voltage-loop in the Grid-Side Converter is used to regulate the DC-link voltage and generate the required currents for the inner current-loop in the Grid-Side Converter. Two integral-type terminal sliding-mode controllers are proposed to control the active and reactive powers exchanged between the Converter and the grid. The switching signals in the controllers are softened to attenuate chattering. The time-varying gains in the controllers are constructed to reduce control energy wastage and avoid overestimation of the boundaries of system uncertainties. Simulated and experimental results validate the proposed method.
Xuemei Zheng - One of the best experts on this subject based on the ideXlab platform.
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Integral-Type Terminal Sliding-Mode Control for Grid-Side Converter in Wind Energy Conversion Systems
IEEE Transactions on Industrial Electronics, 2019Co-Authors: Xuemei Zheng, Yong Feng, Fengling HanAbstract:This paper investigates robust control strategies for wind energy conversion systems with variable-speed permanent magnet synchronous generators, which are integrated into the grid to provide reliable, secure, and efficient electrical power. A three-phase Grid-Side Converter without a grid transformer is connected to the grid using an LCL filter with low resistive losses. In these working conditions, an instantaneous power proportional integral (PI) controller for the outer voltage-loop in the Grid-Side Converter is used to regulate the DC-link voltage and generate the required currents for the inner current-loop in the Grid-Side Converter. Two integral-type terminal sliding-mode controllers are proposed to control the active and reactive powers exchanged between the Converter and the grid. The switching signals in the controllers are softened to attenuate chattering. The time-varying gains in the controllers are constructed to reduce control energy wastage and avoid overestimation of the boundaries of system uncertainties. Simulated and experimental results validate the proposed method.
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Full-Order Terminal Sliding-Mode Control for LCL Type Grid-Side Converter
2018 IEEE 8th Annual International Conference on CYBER Technology in Automation Control and Intelligent Systems (CYBER), 2018Co-Authors: Xuemei Zheng, Chang Xinrui, Chen Ruobo, Liguo Wang, Yong FengAbstract:This paper investigates the robust control strategies for the LCL type Grid-Side Converter. The voltage outer loop adopts the traditional voltage vector orientation control, and the main function is to stabilize the DC side voltage. The current inner loop is designed in the synchronous rotating coordinate system, and adopts full-order sliding mode control strategy. Two full-order sliding-mode controllers are proposed to control the grid current to realize the unity power factor and on-grid. It is the most widely used control strategy that facilitates the design of Grid-Side filtering parameters. The time-varying gains in the controllers are constructed to reduce the waste of the control energy and avoid the overestimation of the bound of the system uncertainties. Finally, the simulation results validate the proposed method.
