The Experts below are selected from a list of 50223 Experts worldwide ranked by ideXlab platform
Frede Blaabjerg - One of the best experts on this subject based on the ideXlab platform.
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analysis of phase locked loop influence on the stability of single phase grid connected Inverter
International Symposium on Power Electronics for Distributed Generation Systems, 2015Co-Authors: Chong Zhang, Xiongfei Wang, Frede BlaabjergAbstract:A controlled Power Inverter can cause instability at the point of common coupling (PCC) with its output filter and the grid. This paper analyzes the influence of the Phase-Locked Loop (PLL) on the output admittance of single-phase current-controlled Inverters with different grid stiffness. It shows that the PLL introduces a paralleled admittance into the output admittance of the Inverter, which may lead to unintentional low-order harmonic oscillation in a weak grid. Moreover, the Second Order Generalized Integrator PLL (SOGI-PLL) is also modeled. It is found that the quadrature signal generator of SOGI plays a stabilizing role in grid-Inverter interactions, which thus provides a promising candidate for avoiding the PLL-induced instability in single-phase Inverters. Simulation results are presented for verifying the theoretical analysis. The possible instability due to different PLL bandwidth is also demonstrated.
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modulation methods for neutral point clamped wind Power converter achieving loss and thermal redistribution under low voltage ride through
IEEE Transactions on Industrial Electronics, 2014Co-Authors: Frede BlaabjergAbstract:The three-level neutral-point (NP)-clamped (3L-NPC) converter is a promising multilevel topology in the application of megawatt wind Power generation systems. However, the growing requirements by grid codes may impose high stress and even give reliability problem to this converter topology. This paper investigates the loss and thermal performances of a 10-MW 3L-NPC wind Power Inverter undergoing low-voltage ride-through (LVRT) operation. A series of new space vector modulation methods is then proposed to relocate the thermal loading among the Power switching devices. It is concluded that, with the proposed modulation methods, the thermal distribution in the 3L-NPC wind Power Inverter undergoing LVRT becomes more equal, and the junction temperature of the most stressed devices can be also relieved. Also, the control ability of the dc-bus NP potential, which is one of the crucial considerations for the 3L-NPC converter, is even more improved by the proposed modulation methods.
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thermal optimised modulation methods of three level neutral point clamped Inverter for 10 mw wind turbines under low voltage ride through
Iet Power Electronics, 2012Co-Authors: Frede BlaabjergAbstract:The three-level neutral-point-clamped (3L-NPC) converter is a promising multilevel topology for use in the megawatts wind Power generation system. However, the requirements for the grid side Inverter under low-voltage ride through (LVRT) of Power grid could impose extreme stress to the switching devices in this converter topology. The study investigates the loss and thermal performances of a 10 MW 3L-NPC wind Power Inverter undergoing LVRT condition. A new space vector modulation method is proposed to optimise the thermal distribution of this extreme situation. It is concluded that, with the proposed modulation method, the thermal distribution in the 3L-NPC wind Power Inverter under LVRT becomes more equal and the junction temperature of the most stressed Power device can be significantly reduced, whereas the control ability of DC-bus neutral point potential is not compromised.
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reactive Power influence on the thermal cycling of multi mw wind Power Inverter
Applied Power Electronics Conference, 2012Co-Authors: Marco Liserre, Frede BlaabjergAbstract:In this paper the reactive Power influence on the thermal cycling of Power devices in grid-connected Inverter for 10 MW wind turbines is investigated. Restrained by the grid codes, the allowable reactive Power ranges in relation to amplitude and phase angle of the load current for a single converter system are first presented at different wind speeds. Furthermore, the interaction between paralleled converter systems in a wind park is also considered and analyzed. By controlling the reactive Power circulated among paralleled converters, a new concept is then proposed to stabilize the thermal fluctuation of the Power devices during wind gusts. It is concluded that the reactive Power may change the thermal distribution of Power devices. By properly controlling the reactive Power, it is possible to achieve a more stable junction temperature in the Power devices during the fluctuation of wind speed, and thereby could provide a new way to improve the reliability of the wind Power conversion system.
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Power Inverter topologies for photovoltaic modules a review
IEEE Industry Applications Society Annual Meeting, 2002Co-Authors: Soren Baekhoj Kjaer, John Kim Pedersen, Frede BlaabjergAbstract:This review-paper focuses on the latest development of Inverters for photovoltaic AC-modules. The Power range for these Inverters is usually within 90 Watt to 500 Watt, which covers the most commercial photovoltaic-modules. Self-commutated Inverters have replaced the grid-commutated ones. The same is true for the bulky low-frequency transformers versus the high-frequency transformers, which are used to adapt the voltage level. The AC-module provides a modular design and a flexible behaviour in various grid conditions. It hereby opens the market for photovoltaic-Power for everyone at a low cost due to the plug and play concept, which also makes a further enlargement of the system possible.
Juan Rivas Davila - One of the best experts on this subject based on the ideXlab platform.
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low mass rf Power Inverter for cubesat applications using 3 d printed inductors
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2017Co-Authors: Wei Liang, Max Praglin, Brian Holman, Luke Raymond, Fabio Righetti, David Biggs, Mark A Cappelli, Juan Rivas DavilaAbstract:This paper presents the design of a low-mass RF Power Inverter at moderate to high Power levels (e.g., tens of watts and above) for weight critical applications such as CubeSat plasma thrusters. Our approach for mass reduction includes resonant switching operation at tens of MHz, and the 3-D printing of lightweight scaffolds that form air core inductors after plating with a thin layer of copper. Specifically, we present a 14.2-MHz 50-W resonant dc-RF Power Inverter implemented with 3-D printed and copper plated air core toroidal inductors. As a demonstration of design flexibility of the 3-D printing process, these toroidal inductors are designed and implemented with optimal cross sections [1] to improve quality factors. The weight of the proposed Inverter is reduced by 50% when compared to a 40-W state-of-the-art counterpart in which all the inductors were implemented within the printed circuit board. The Inverter achieves 91% electrical efficiency when operated on a 50- $\Omega $ resistive load at an input voltage of 50 V. To prove its capability of driving plasma loads, the Inverter was first tested with a matching network running an inductively coupled plasma (ICP) in a low-pressure argon ampoule outside vacuum environment. The Inverter drew 50 W to run the ICP at an input voltage of 20 V. Then as an example application, the Inverter was tested with another specifically tuned matching network to drive a helicon double layer (HDL) plasma intended for CubeSat thruster applications. The HDL plasma was formed in a vacuum chamber and was fed with argon. The combined Inverter and matching network outputs 40 W and achieves 86% dc input to plasma efficiency at an input voltage of 40 V.
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low mass rf Power Inverter for cubesat plasma thruster using 3d printed inductors
Workshop on Control and Modeling for Power Electronics, 2016Co-Authors: Wei Liang, Max Praglin, Brian Holman, Luke Raymond, Fabio Righetti, David Biggs, Mark A Cappelli, Juan Rivas DavilaAbstract:This paper presents the design of a low mass RF Power Inverter at moderate to high Power levels (e.g. tens of watts and above) for weight critical applications such as cubesat plasma thrusters. Our approach for mass reduction includes resonant switching operation at tens of MHz, and the 3D printing of light-weight scaffolds that form air core inductors after plating with a thin layer of copper. Specifically, we present a 14.2 MHz 50 W resonant DC-RF Power Inverter implemented with 3D printed and plated air core toroidal inductors. As a demonstration of design flexibility of the 3D printing process, these toroidal inductors are designed and implemented with optimal cross sections [1] to improve quality factors. The weight of the proposed Inverter is reduced by 50% when compared to a 40 W state-of-the-art counterpart in which all the inductors were implemented within the printed circuit board (PCB). The Inverter achieves 90% electrical efficiency when operated on a 50 Ω resistive load at an input voltage of 50 V. Then the Inverter was implemented with a low pass matching network to drive a helicon double layer (HDL) plasma intended for a cubesat thruster application. The combined Inverter and matching network outputs 40 W and achieves 86% DC input to plasma efficiency at an input voltage of 40 V.
Wei Liang - One of the best experts on this subject based on the ideXlab platform.
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low mass rf Power Inverter for cubesat applications using 3 d printed inductors
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2017Co-Authors: Wei Liang, Max Praglin, Brian Holman, Luke Raymond, Fabio Righetti, David Biggs, Mark A Cappelli, Juan Rivas DavilaAbstract:This paper presents the design of a low-mass RF Power Inverter at moderate to high Power levels (e.g., tens of watts and above) for weight critical applications such as CubeSat plasma thrusters. Our approach for mass reduction includes resonant switching operation at tens of MHz, and the 3-D printing of lightweight scaffolds that form air core inductors after plating with a thin layer of copper. Specifically, we present a 14.2-MHz 50-W resonant dc-RF Power Inverter implemented with 3-D printed and copper plated air core toroidal inductors. As a demonstration of design flexibility of the 3-D printing process, these toroidal inductors are designed and implemented with optimal cross sections [1] to improve quality factors. The weight of the proposed Inverter is reduced by 50% when compared to a 40-W state-of-the-art counterpart in which all the inductors were implemented within the printed circuit board. The Inverter achieves 91% electrical efficiency when operated on a 50- $\Omega $ resistive load at an input voltage of 50 V. To prove its capability of driving plasma loads, the Inverter was first tested with a matching network running an inductively coupled plasma (ICP) in a low-pressure argon ampoule outside vacuum environment. The Inverter drew 50 W to run the ICP at an input voltage of 20 V. Then as an example application, the Inverter was tested with another specifically tuned matching network to drive a helicon double layer (HDL) plasma intended for CubeSat thruster applications. The HDL plasma was formed in a vacuum chamber and was fed with argon. The combined Inverter and matching network outputs 40 W and achieves 86% dc input to plasma efficiency at an input voltage of 40 V.
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low mass rf Power Inverter for cubesat plasma thruster using 3d printed inductors
Workshop on Control and Modeling for Power Electronics, 2016Co-Authors: Wei Liang, Max Praglin, Brian Holman, Luke Raymond, Fabio Righetti, David Biggs, Mark A Cappelli, Juan Rivas DavilaAbstract:This paper presents the design of a low mass RF Power Inverter at moderate to high Power levels (e.g. tens of watts and above) for weight critical applications such as cubesat plasma thrusters. Our approach for mass reduction includes resonant switching operation at tens of MHz, and the 3D printing of light-weight scaffolds that form air core inductors after plating with a thin layer of copper. Specifically, we present a 14.2 MHz 50 W resonant DC-RF Power Inverter implemented with 3D printed and plated air core toroidal inductors. As a demonstration of design flexibility of the 3D printing process, these toroidal inductors are designed and implemented with optimal cross sections [1] to improve quality factors. The weight of the proposed Inverter is reduced by 50% when compared to a 40 W state-of-the-art counterpart in which all the inductors were implemented within the printed circuit board (PCB). The Inverter achieves 90% electrical efficiency when operated on a 50 Ω resistive load at an input voltage of 50 V. Then the Inverter was implemented with a low pass matching network to drive a helicon double layer (HDL) plasma intended for a cubesat thruster application. The combined Inverter and matching network outputs 40 W and achieves 86% DC input to plasma efficiency at an input voltage of 40 V.
John Kim Pedersen - One of the best experts on this subject based on the ideXlab platform.
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Power Inverter topologies for photovoltaic modules a review
IEEE Industry Applications Society Annual Meeting, 2002Co-Authors: Soren Baekhoj Kjaer, John Kim Pedersen, Frede BlaabjergAbstract:This review-paper focuses on the latest development of Inverters for photovoltaic AC-modules. The Power range for these Inverters is usually within 90 Watt to 500 Watt, which covers the most commercial photovoltaic-modules. Self-commutated Inverters have replaced the grid-commutated ones. The same is true for the bulky low-frequency transformers versus the high-frequency transformers, which are used to adapt the voltage level. The AC-module provides a modular design and a flexible behaviour in various grid conditions. It hereby opens the market for photovoltaic-Power for everyone at a low cost due to the plug and play concept, which also makes a further enlargement of the system possible.
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a hybrid current source voltage source Power Inverter circuit
IEEE Transactions on Power Electronics, 2001Co-Authors: Andrzej M Trzynadlowski, N Patriciu, Frede Blaabjerg, John Kim PedersenAbstract:A combination of a large current-source Inverter and a small voltage-source Inverter circuits is analyzed. The resultant hybrid Inverter inherits certain operating advantages from both the constituent converters. In comparison with the popular voltage-source Inverter, these advantages include reduced switching losses, improved quality of output current waveforms, and faster dynamic response to current control commands. Description of operating principles and characteristics of the hybrid Inverter is illustrated with results of experimental investigation of a laboratory model.
Kuanghsiung Tan - One of the best experts on this subject based on the ideXlab platform.
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squirrel cage induction generator system using wavelet petri fuzzy neural network control for wind Power applications
IEEE Transactions on Power Electronics, 2016Co-Authors: Kuanghsiung TanAbstract:A wavelet Petri fuzzy neural network (WPFNN) controller is proposed to control squirrel-cage induction generator (SCIG) system with an ac/dc Power converter and a dc/ac Power Inverter for grid-connected wind Power applications. First, the ac/dc Power converter and the dc/ac Power Inverter are developed to deliver the electric Power generated by a three-phase SCIG to Power grid. Moreover, the ac/dc Power converter and the dc/ac Power Inverter are mainly designed to control the mechanical rotor speed, dc-link voltage, and reactive Power output of the SCIG system, respectively. Furthermore, since the varying active Power outputs of the dc/ac Power Inverter seriously affect the tracking control of the dc-link voltage, a novel intelligent WPFNN controller is proposed to replace the traditional proportional-integral controller for the tracking control of the dc-link voltage in this study. In addition, the network structure and the online learning algorithm of the proposed WPFNN are described in detail. Finally, some experimental results are provided to show the effectiveness of the intelligent controlled-SCIG system using the proposed WPFNN controller for grid-connected wind Power applications.