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Grid Impedance Impact Analysis of the Weak Grid-Tied VSC
2021 IEEE Green Technologies Conference (GreenTech), 2021The grid impedance is widely recognized as the key factor to the stability of the grid-tied power electronic devices. However, the influence of the grid impedance ratio is always neglected due to the assumption that grid reactance is much large than grid resistance.
Hong Hu +9 more
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Control of a grid connected converter during weak grid conditions
2016 IEEE 7th International Symposium on Power Electronics for Distributed Generation Systems (PEDG), 2016The focus on renewable energy sources have been increasing since the late 80s in Denmark. Especially focus on wind power has been increasing, with implementation of big on- and offshore wind farms. However, when installing the wind farms, these are often placed distant from the utility grid, like the case for offshore wind turbines.
Lorenzen, Søren Lund +2 more
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Grid Integration of Renewable Energy Sources into Weak Grids
2022This dissertation investigates the grid integration of converter-based renewable energy sources (RESs) into weak grids. For this purpose, a grid-following inverter (GFLI) is chosen as the RES, and its stability is analyzed. Additionally, the thesis proposes a method for the stability enhancement of the GFLI.
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Stability Analysis of Grid-Connected Inverter in Weak Grid Systems
Advanced Materials Research, 2012Distributed Generation may be located far away from load centers due to their use of new energy resource distribution characteristics. In this case, Long distance transmission lines will introduce an equivalent impedance to the grid, so that the grid showing the characteristics of a weak grid.
Xin Chen, Chun Yin Gong, Lin Cheng
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Instability of Grid Connected Converter Under Weak AC Grid Conditions
2019 IEEE Transportation Electrification Conference and Expo (ITEC), 2019Renewable energy sources like wind or hydrogen have been worked as a reliable option to traditional power sources. But for distributed power generation systems (DPGSs), the operation of the grid-connected converter under the weak ac grid condition has been a challenge for the stability and power quality issues.
Xinyue Zhang +5 more
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Regulator reconstruction strategy of grid-connected inverter in weak grid
2016 IEEE 8th International Power Electronics and Motion Control Conference (IPEMC-ECCE Asia), 2016In order to suppress LCL inherent resonance and grid background harmonic problems, virtual impedance control based on capacitor current feedback and grid voltage feedforward control strategies are typically introduced in grid-connected inverters. However, the inverter control strategy can't make the system operate stably in a weak grid.
null Qinglin Zhao +4 more
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Weak Grid Impacts on Stability of Voltage Source Inverters —Asymmetrical Grid
2018 IEEE Energy Conversion Congress and Exposition (ECCE), 2018This paper presents the stability analysis of voltage source inverters (VSIs) in the presence of asymmetrical weak grids. Large grid impedances associated with weak grids can make grid-connected VSIs unstable. State-of-the-art research on the stability in weak grids focuses solely on symmetrical grid impedances, with little attention paid to the ...
Aswad Adib +3 more
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Model Predictive Control of Grid Side Converter in The Weak Grid
2019 IEEE International Symposium on Predictive Control of Electrical Drives and Power Electronics (PRECEDE), 2019The grid side converter (GSC) needs proper controller design when connected to the weak grid, otherwise it becomes unstable due to the overlook of grid impedance dynamic. Although the phase locked loop (PLL) will cause the instability of the interconnected system that consists of GSC and inductive grid due to its negative damping characteristic, the ...
Liang Chen +4 more
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