Comparative Impedance Characteristic Analysis of Grid-Following and Grid-Forming Inverters
IET Renewable Power Generation, 2023 ABSTRACT This paper comprehensively analyses the impedance characteristics of grid‐following (GFL) and grid‐forming (GFM) inverters at around synchronous frequency areas considering various operating and grid connection conditions and control settings.
Yonggang Zhang +3 more
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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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Impedance stability analysis and impedance remodelling of matrix converter grid‐connected system [PDF]
The Journal of Engineering, 2020 Matrix converter has become one of the research hotspots of power electronic converter due to its excellent input and output characteristics and adjustable power factor. To study the stability of the matrix converter grid‐connected system, the harmonic linearisation method is adopted to model the positive and negative sequence output impedance models ...
Rutian Wang, Guoqing He, Bo Zhang
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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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Impedance-compensated grid synchronisation for extending the stability range of weak grids with voltage source converters [PDF]
, 2016 This paper demonstrates how the range of stable power transfer in weak grids with voltage source converters (VSCs) can be extended by modifying the grid synchronisation mechanism of a conventional synchronous reference frame phase locked loop (PLL).
D'Arco, Salvatore +3 more
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An Online Event-Based Grid Impedance Estimation Technique Using Grid-Connected Inverters [PDF]
IEEE Transactions on Power Electronics, 2021 An increasing intake of grid-connected inverters could change the characteristics of low voltage networks including the equivalent grid impedance seen by each inverter at its point of common coupling. This can impact the overall performance of the inverters, and thus it becomes necessary for grid-connected inverters to estimate the grid impedance ...
Nabil Mohammed +2 more
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Rapid Multivariable Identification of Grid Impedance in DQ Domain Considering Impedance Coupling
IEEE Journal of Emerging and Selected Topics in Power Electronics, 2022 Identifying grid-impedance at the point of common coupling is essential for the adaptive control and the online stability analysis of grid-connected converters. A balanced three-phase system is commonly modeled by d and q components in the synchronous reference frame. In identification of the synchronous reference-frame impedance components, errors may
Matias Berg +2 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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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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