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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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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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Virtual Impedance Control for Safe Human-Robot Interaction
Journal of Intelligent & Robotic Systems, 2015Collision avoidance is essential for safe robot manipulation. Especially with humans around, robots should work only when safety can be robustly guaranteed. In this paper, we propose using virtual impedance control for reactive, smooth, and consistent collision avoidance that interferes minimally with the original task.
Sheng-Yen Lo +2 more
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A Control Method for Parallel Inverter with Adaptive Virtual Impedance
2018 5th International Conference on Systems and Informatics (ICSAI), 2018Aiming at the influence that the difference of line impedance of multi-inverter parallel system to accuracy of uniform power distribution in system, this paper proposes a control method based on adaptive virtual impedance and variable droop coefficient. Based on the research of adaptive virtual impedance link, variable droop coefficients control method
Ben Nie, Xiangming Li
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Virtual Biopsies in Barrett's Esophagus Using an Impedance Probe
Annals of the New York Academy of Sciences, 1999Abstract: Preliminary results of electrical impedance measurements in squamous and columnar epithelia in rat and human tissues are presented. The aim of this work is to show the possibility of differentiating these two types of epithelia in terms of their electrical characteristics. For the measurements, we employed a 1.95m‐long, 3.2‐mm‐diameter, four‐
C A, González-Correa +8 more
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Control of mobile manipulator using a virtual impedance wall
Proceedings 2002 IEEE International Conference on Robotics and Automation (Cat. No.02CH37292), 2003We present a method for controlling mobile manipulators for assist systems. The mobile manipulator should provide good manipulability and stability at any time. Most of mobile assist systems have a heavy mobile base for stability. We propose an approach for motion control of a mobile manipulator to remove unnecessary movement of the mobile base. In our
Tomohito Takubo +2 more
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Fuzzy virtual impedance controller in human-vehicle interaction
2009 IEEE International Conference on Systems, Man and Cybernetics, 2009In the previous studies mechanical impedance has become well implement in the field of human-machine interaction. However, in human-vehicle interaction there is a variant environment when driving a vehicle, thus apart from interacting with human, impedance controller is needed to adapt to the variant environment. But for mechanical impedance as being a
Shenghao Zhou, Seiji Yasunobu
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A Novel Concept of Virtual Impedance for High Frequency Tri-Band Impedance Matching Networks
IEEE Transactions on Circuits and Systems II: Express Briefs, 2018This brief introduces a novel concept of a virtual impedance for tri-band impedance matching. The proposed mathematical concept, when applied in practical realization, simplifies the design of tri-band matching to a great extent and also enhances the achievable frequency transformation ratios beyond 7.3.
Deepayan Banerjee +2 more
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Modified Adaptive Virtual Impedance Method to Compensate Mismatched Line Impedances in Microgrids
2019 IEEE Applied Power Electronics Conference and Exposition (APEC), 2019Under mismatched line impedance conditions, reactive power sharing performance of droop control tends to be barely satisfactory for the absence of sharing accuracy. Therefore, to realize accurate reactive power sharing of parallel-connected inverters in microgrids, a modified adaptive virtual impedance method is proposed in this paper.
Ronghui AN, Zeng LIU, Jinjun LIU
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