Results 11 to 20 of about 1,002,790 (325)
Utility harmonic impedance estimation based on mutual information and data optimization
电力工程技术, 2023 Accurate calculation of harmonic impedance is the premise of harmonic control and reasonable division of harmonic responsibility. The existing harmonic impedance estimation methods should meet the conditions that the background harmonic fluctuations are ...
XU Fangwei +5 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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Harmonic mitigation potential of shunt harmonic impedances [PDF]
Electric Power Systems Research, 2003 Abstract Although complete compensation is only possible using true active filters, shunt harmonic impedances (SHI) have been shown to provide a considerable reduction of the harmonic propagation. In this paper, the mitigation potential of different SHI is investigated, together with their VA-rating. It is shown that a resistive impedance of 1 pu for
Ryckaert, Wouter +2 more
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Experimental assessment of harmonic contributions using a ternary pulse sequence [PDF]
Serbian Journal of Electrical Engineering, 2021 Harmonic contributions of utility and customer may feature significant variations due to network switchings and changing operational modes. In order to correctly define the impacts on the grid voltage distortion the frequency dependent impedance
Bulycheva Evgeniia, Yanchenko Sergey
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IEEE Journal of Solid-State Circuits, 2021 In this article, a distributed-swing-boosting and harmonic-impedance-expanding multi-core oscillator is proposed to achieve low phase noise and high figure-of-merit (FoM), simultaneously. First, a distributed-coupling multi-core topology is introduced to
Yiyang Shu, H. Qian, Xiang Gao, Xun Luo
semanticscholar +1 more source
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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Zhongguo dianli, 2021 With the extensive application of photovoltaic inverter, the harmonic generated during its operation overlaps with the background harmonic of the system at the access point, which causes harmonic amplification and even resonance problems. It is therefore
Xu ZHANG +4 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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Energies, 2022 There are a huge number of harmonics in the railway power supply system. Accurately estimating the harmonic impedance of the system is the key to evaluating the harmonic emission level of the power supply system. A harmonic impedance estimation method is
Yankun Xia, Wenzhang Tang
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Impedance Characteristics and Harmonic Analysis of LCL-Type Grid-Connected Converter Cluster
Energies, 2022 This study addresses the output impedance model of the LCL-type grid-connected converter considering the dead-time effects and the digital control delay.
Xiaojie Zhou, Dezhi Xu, Yourui Huang
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