Results 241 to 250 of about 187,993 (287)

Stability Analysis of Grid-Connected Inverter in Weak Grid Systems

Advanced Materials Research, 2012
Distributed 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), 2019
Renewable 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, Chen Liu, Rui Ma, Hao Bai, Franck Gechter, Fei Gao   +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), 2016
In 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, null Haopu Zhang, null Wenlu Song, null Xiaoyi Li, null Qiuxia Yang   +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), 2018
This 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, Fariba Fateh, Mohammad B. Shadmand, Behrooz Mirafzal   +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), 2019
The 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, Dan Sun, YunYang Xu, Heng Nian, Yue Fan   +4 more
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An Improved Grid Voltage Feedforward Compensation Scheme of Grid-Connected Inverter in Weak Grid

2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC), 2018
The grid voltage feedforward control strategy is widely used in the grid-connected inverter, aiming to reduce the disturbance of grid voltage distortion and suppress the impulse current of inverter at startup. However, an extra positive feedback channel will be introduced into the current control loop in weak grid, bringing low harmonics and even ...
Ming Li, Xing Zhang, Haizheng Zhang, Hang Zhang, Weiqi Guan   +4 more
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Harmonic compensation method of grid-tied converters in a weak grid

2017 Chinese Automation Congress (CAC), 2017
In this paper, a control strategy is proposed to compensate the voltage of point of common coupling (PCC) voltage and grid current harmonic by using line end grid connected inverter. The control strategy uses the current and voltage information at the outlet of the inverter and indirectly calculates the voltage at the PCC in conjunction with the ...
Deng Hua, Li Guanyang, Cui Chen, Wang Shanlong, Zhao Zhongtian, Wang Hongzhao   +5 more
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The Grid Impedance Adaptation Dual Mode Control Strategy In Weak Grid

2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), 2018
With the increasing penetration of distributed energy resources and the wide distribution of access point, the power grid is becoming more and more weak. For the two main stability control strategies in weak grid, namely the current source grid connected mode (CSM) and the voltage source grid connected mode (VSM), the static characteristics of the ...
Ming Li, Xing Zhang, Ying Yang, Pengpeng Cao   +3 more
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Stability Control for Wind in Weak Grids

IEEE Transactions on Sustainable Energy, 2019
4 Hz oscillations and 30 Hz oscillations have been observed in real-world wind farms with weak grid interconnections. Such stability issues limit wind power delivery. This paper proposes mechanism-based feedback control strategies suitable for vector control based voltage source converters employed in Type-3 and Type-4 wind to enhance the overall ...
Yin Li, Lingling Fan, Zhixin Miao
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Connection of inverters to a weak grid

2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018), 2002
Connection of an inverter to export power to the mains for a stiff supply is well understood. This paper examines the dynamics of power export to a weak grid. In this case the local bus angle changes for changes in export power which interferes with the process of synthesizing the inverter voltage.
G. Ledwich, H. Sharma
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