Results 21 to 30 of about 44,267 (264)
IEEE Access, 2020 The phase-locked loop of grid-connected inverters affects their output impedance characteristics and stability. Based on the NPC, three-level LCL grid-connected inverter, this article first analyzes the frequency characteristics of the improved moving ...
Wei Luo, Dafang Wei, Jianguo Jiang
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Frontiers in Energy Research, 2022 Under the condition of weak grid, the coupling between parallel inverters and grid impedance is easy to cause harmonic resonance, which seriously affects the grid-connected power quality. First, the equivalent circuit model of the multi-inverter parallel
Tao Zhao +4 more
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Active Harmonic Compensation and Stability Improvement in High-Power Grid-Connected Inverters Using Unified Power Quality Conditioner [PDF]
International Journal of Industrial Electronics, Control and Optimization, 2023 Multifunctional features of grid-connected inverters can be used for harmonic compensation of local load voltage and grid-injected current. But, in high-power grid-connected inverters, there is a challenge due to low switching frequency.
Elham Samavati, Hamid Reza Mohammadi
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Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters
Energies, 2019 Grid impedance is an important parameter which affects the control performance of grid-connected power converters. Several methods already exist for optimizing the converter control system based on knowledge of grid impedance value.
Roni Luhtala +6 more
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Wide-Band Harmonic Impedance Measurement Device for Wind Grid Based on Cascaded H-Bridge Converter
, 2022 In wind power generation, the coupling of the wind farm power pooling system with the grid may cause high frequency resonance problems and affect the power quality of the grid.
Zijie LIN +6 more
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Analysis of online impedance measurement range based on voltage disturbance injection
Energy Reports, 2020 The harmonic injection method is often used to measure the impedance of grid-connected inverter, which is necessary for impedance-based stability analysis of grid-connected systems.
Fei Li +5 more
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Quasi-Proportional Resonance Control of Grid-Connected Inverter Based on Grid Impedance
Zhongguo dianli, 2019 With the large-scale integration of renewable energy to the grid, the problem of sub/super-synchronous oscillations caused by the interaction of renewable energy grid-connected inverters with the grid has drawn great public attention.
Shaojian SONG +4 more
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Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics
Energies, 2021 Grid impedance is an important parameter and is used to perform impedance-based stability analysis for the operation of grid-connected systems, such as power electronics-interfaced solar, wind and other distributed power generation systems.
Matthias Buchner, Krzysztof Rudion
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A Modified DQ Impedance Model of Three-Phase Grid-Connected Inverter-Grid System Considering Coupling between Inverter and Grid [PDF]
, 2020 This paper presents a modified dq impedance model of the three-phase voltage source grid-connected inverter (GCI)-grid system considering coupling effect between GCI part and grid part for small-signal stability analysis.
Yanbo Wang +9 more
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Energies, 2021 This paper proposes a deep-learning-based method for frequency-dependent grid impedance estimation. Through measurement of voltages and currents at a specific system bus, the estimate of the grid impedance was obtained by first extracting the sequences ...
Azam Bagheri +3 more
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