Results 211 to 220 of about 10,246 (263)
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Virtual Impedance Method for Mutual Coupling Compensation
IEEE Transactions on Antennas and Propagation, 2021The radiation pattern of an antenna within an array environment is modified by mutual coupling to neighboring elements, which can create unknown phase and amplitude variation on the order of 10° and 5 dB. This uncertainty in the element patterns results in beamforming errors, which can be particularly problematic for applications requiring precise ...
Carl Pfeiffer +4 more
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Impedance control with virtual compliance
Proceedings of the Third International Workshop on Robot Motion and Control, 2002. RoMoCo '02., 2003In the paper a new concept of impedance control for a simple 1D dynamical system has been presented. The new approach lies in treating a task of reaching a contact plane and generating desired force on environment as one control problem that can be realized by one coherent control equation.
P. Dutkiewicz, M. Michalek
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Virtual Impedance Shaping for low voltage Microgrids
2020 IEEE Applied Power Electronics Conference and Exposition (APEC), 2020AC Microgrids, in presence of highly non-linear loads, require a tighter regulation of line voltage to maintain power quality. This article proposes an outer virtual impedance loop to shape the output voltage in such microgrids. In order to achieve this, a virtual impedance extracting and shaping filter is first proposed to extract and weigh selected ...
Sourav Patel +3 more
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Virtual impedance design of virtual synchronous generation in microgrid
2014 International Power Electronics and Application Conference and Exposition, 2014The adoption of virtual synchronous generation (VSG) control can maintain the stability of voltage and frequency in power electronic interfaced mircogrid. In this paper virtual impedance is added to the VSG control strategy in order to improve the system control performance in resistive-inductive line impedance, the influence of virtual impedance on ...
Chao Hu +4 more
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Virtual Impedance Adaptive Study of Parallel Virtual Synchronous Generators
2019 22nd International Conference on Electrical Machines and Systems (ICEMS), 2019As the increasing of the capacity of the micro grid, it is difficult for a single VSG-controlled inverter to meet the requirements of micro grid use. VSG operating in parallel has become the main solution, and the problem of equalization in the division has naturally become the focus of research.
Chunxue Wen, Yaozhi Huang, Qi Xiong
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Object shape virtualization in impedance tomography
COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, 2009PurposeThe purpose of this paper is to introduce a method for increasing imaging quality in impedance tomography. The paper presents an optical method of shape virtualization, processing algorithm draft and results of virtualization for sample objects.Design/methodology/approachIn impedance tomography the image reconstruction algorithms must yield ...
Tomasz Grzywacz +2 more
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Virtual Impedance Analyzer Design and Implementation
Second International Conference on Innovative Computing, Informatio and Control (ICICIC 2007), 2007In this research, the structure and design of virtual impedance analyzers are studied. The construction process is also described and introduced. This programmable virtual impedance analyzer is achieved by software part, Labview, hardware part, DAQ card and some external circuits.
Kai-chao Yao +3 more
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Virtual Impedance Design Considerations for Virtual Synchronous Machines in Weak Grids
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020Most renewable energy sources (RESs) are interfaced to electricity grids via voltage-source converters (VSCs). To facilitate the integration, the controllers based on the emulation of synchronous generators have been increasingly used. This control technique is commonly referred to as Virtual Synchronous Machine (VSM) and recent studies have shown that
Alberto Rodriguez-Cabero +2 more
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Damping Effect of Virtual Synchronous Machines Provided by a Dynamical Virtual Impedance
IEEE Transactions on Energy Conversion, 2021Virtual synchronous machines (VSMs) emulate the swing equation for grid synchronization and inertia provision. Usually, a large damping coefficient is necessary in VSMs to provide equivalent damper winding effect, which is, however, not aligned with the fact that the physical swing equation of synchronous generators (SGs) contains only a small ...
Linbin Huang +4 more
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A Novel Virtual Impedance Method for Interfacing Renewable to Grid with High Impedance
2023 IEEE PES Innovative Smart Grid Technologies - Asia (ISGT Asia), 2023Currently, grid-following inverter (GFL) has become a vital component in the integration of renewable energy sources into power grids. A Modified Virtual Impedance - Phase Locked Loop (MVI-PLL) method is proposed to address instability problems that occur when using a PLL under high grid impedance conditions in GFL.
Nguyen, Phuoc Sang +2 more
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