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Design and analysis of virtual impedance control scheme based on MESOGI for improving harmonic sharing of nonlinear loads [PDF]
Scientific ReportsUnder the presence of nonlinear load, the most existing virtual impedance (VI) methods-based control solution performs poorly in reactive power sharing among droop-operated VSIs in microgrids (MGs).
Abdelhammid Kherbachi +5 more
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Estimation of harmonic impedance and resonance in power systems
International Journal of Electrical and Computer Engineering (IJECE)Since power systems are designed to work at the fundamental frequency, the presence of other frequencies from various sources may induce series and parallel resonances, leading to damage. The behavior of the power system in the presence of harmonics becomes evident with knowledge of harmonic impedance.
Haitham Ali Alashaary +3 more
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Energy Conversion and Economics, 2022 In an islanded microgrid (IMG), droop control effectively shares real and reactive power demands among distributed generators (DGs), thereby regulating the frequency and voltage in high X/R ratio networks.
Muli Malakondaiah +3 more
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Time-varying harmonic impedance estimation based on locally-geographically weighted regression
电力工程技术In existing estimation methods for utility harmonic impedance, it is commonly assumed that the harmonic impedance remains invariant, which often diverges from actual conditions.
XU Fangwei +5 more
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Fault location for aircraft distribution systems using harmonic impedance estimation
IET Electrical Systems in Transportation, 2012 The demands for `more electric aircraft` will increase the power distribution requirements of future aircraft electrical distribution systems. To increase safety and reduce aircraft maintenance times on the ground, there is also a need for system condition monitoring to quickly identify and locate any electrical faults which may develop.
Q. Zhou, M. Sumner, D. Thomas
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IEEE Access, 2022 Accurate estimation of the utility harmonic impedance is significant for harmonic control and responsibility division. Traditional methods of estimating the utility harmonic impedance are valid on the premise that the harmonic impedance on the wind-farm ...
Runze Zhou +4 more
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Direction-of-arrival estimation with blind surface impedance compensation for spherical microphone array [PDF]
JASA Express Letters, 2021 The direction-of-arrival (DoA) estimation from spherical microphone array data requires mode strength compensation for removing the dependency on the array surface impedance.
Dongheon Lee, Byeongho Jo, Jung-Woo Choi
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Dynamic Impedance Estimation: Challenges and Considerations
Applied Sciences, 2021 The objective of this paper was to examine the dynamic impedance estimation of electrical systems from online measurements. The paper makes several considerations and highlights the challenges to obtain a precise estimation.
Mateus M. de Oliveira +6 more
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Solution technology of system side harmonic variable impedance based on minimum norm
电力工程技术, 2023 To calculate the harmonic impedance on the system side is crucial for the safe and stable operation of the new power system. Existing algorithms for harmonic impedance estimation usually assume that the harmonic impedance on the system side is constant ...
XU Fangwei +3 more
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Assessment on Harmonic Emission Level of Residential Loads with Symmetry and Volatility Constraints
Zhongguo dianli, 2020 The accuracy of harmonic emission level assessment of residential loads is affected by background harmonics or three-phase harmonic unbalance. Based on Norton’s and Davinan’s theorem, a model is constructed for assessment of harmonic emission level.
Huaying ZHANG +5 more
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