Results 21 to 30 of about 233 (207)

Grid impedance estimation based on improved firefly algorithm

IOP Conference Series: Earth and Environmental Science, 2021
Abstract Grid impedance has a great influence on the performance of grid-connected inverters in distributed power generation systems, so accurate grid impedance measurement is a key technique to achieve high-performance adaptive control of grid-connected inverters in weak grid situations.
Liang Lu, Linfeng Hu, Tianyu Liu
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A Method for Assessing Harmonic Emission Level of Photovoltaic Access Point Considering System-Side Harmonic Voltage Fluctuations

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, Yonghai XU, Ziteng LIU, Haiwei JIANG, Shun TAO   +4 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, ZENG Xue, WANG Chuan, ZHENG Hongru   +3 more
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Adaptive PI + VPI Harmonic Current Compensation Strategy under Weak Grid Conditions

Applied Sciences, 2023
With the increase of the penetration rate of renewable energy power generation in the power system, the power grid gradually tends to be weak. Under the scenario of nonlinear load connecting to weak power grid, the grid-side voltage will produce ...
Lili Zhou, Wei Han, Jia Qi, Zhen Zhou
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Estimation of an Unbalanced Grid Impedance Using a Three-Phase Power Converter [PDF]

2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe), 2020
This paper proposes a real-time method for estimating an unbalanced grid impedance using a three-phase converter. In the method, a periodic single-frequency or multi-frequency excitation signal is added to the converter voltage reference. The converter measures currents and voltages at the point of common coupling.
Pirsto, Ville, Routimo, Mikko, Hinkkanen, Marko, Kukkola, Jarno   +4 more
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Study on the Estimation of Utility Harmonic Impedance Based on Minimum Norm of Impedance Difference

IEEE Access, 2020
The existing methods for estimating harmonic impedance usually assume that harmonic impedance is constant in a measurement period. However, for a variety of practical reasons, such as the load change of power grid, utility harmonic impedance may be ...
Fangwei Xu, Chuan Wang, Qin Shu, Zhiquan Ma, Hongru Zheng, Anqing Peng   +5 more
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Robust Inverter Synchronisation for Weak Grid Based on Impedance Estimation

Energies
The growing integration of distributed renewable energy resources interfaced with current power systems through electronic converters presents significant challenges for system monitoring, stability, control and protection.
Phuoc Sang Nguyen, Ghavameddin Nourbakhsh, Gerard Ledwich   +2 more
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Improving Power Delivery of Grid-Connected Induction Machine Based Wind Generators Under Dynamic Conditions Using Feedforward Linear Neural Networks

IEEE Access, 2023
In the conventional grid-connected Wind Energy Conversion System (WECS), the generator side inverter is typically controlled via Field Oriented Control (FOC), while Voltage Oriented Control (VOC) controls the grid side inverter. However, robust operation
Shyamal Shivneel Chand, Ravneel Prasad, Hiye K. Mudaliar, Dhirendran Munith Kumar, Adriano Fagiolini, Marco Di Benedetto, Maurizio Cirrincione   +6 more
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Wavelet-Based Monitor for Grid Impedance Estimation of Three-Phase Networks

IEEE Transactions on Industrial Electronics, 2021
This article proposes a wavelet-based monitor (WBM) for grid impedance estimation, which combines a wavelet-based transient detection scheme (WB-TDS) and a wavelet-based grid impedance estimator (WB-GIE). The WB-TDS employs the analysis of the wavelet coefficients energy for detecting grid impedance changing, whereas the WB-GIE estimates the grid ...
Denis Keuton Alves, Ricardo Lúcio de Araujo Ribeiro, Flávio B. Costa 0001, Thiago de Oliveira Alves Rocha, Josep M. Guerrero   +4 more
openaire   +2 more sources

Topology and Impedance Identification Method of Low-Voltage Distribution Network Based on Smart Meter Measurements

Frontiers in Energy Research, 2022
In recent years, distributed photovoltaic facilities and distributed energy storage are widely connected to a low-voltage distribution network, which makes the topology of the low-voltage distribution network change faster, and the online identification ...
Li Tong, Weijian Chai, Dongqi Wu
doaj   +1 more source