Equivalent circuit modelling of large hydropower plants with complex tailrace system for ultra-low frequency oscillation analysis

2021 ◽  
Author(s):  
Yang Zheng ◽  
Qijuan Chen ◽  
Donglin Yan ◽  
Haiku Zhang
Keyword(s):  
Equivalent Circuit ◽  
Low Frequency ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Oscillation Analysis ◽  
Hydropower Plants ◽  
Circuit Modelling

Low-Frequency Oscillation Analysis of the Train-Grid System Based on an Improved Forbidden-Region Criterion

2018 ◽  
Vol 54 (5) ◽  
pp. 5064-5073 ◽  
Author(s):  
Keteng Jiang ◽  
Chengxiang Zhang ◽  
Xinglai Ge
Keyword(s):  
Low Frequency ◽  
Grid System ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Oscillation Analysis ◽  
Forbidden Region

scholarly journals Modelling of DFIG-based wind turbine for low-frequency oscillation analysis of power system with high penetration of distributed energy

2019 ◽  
Vol 2019 (16) ◽  
pp. 2625-2628
Author(s):  
Yunhui Huang ◽  
Weihao Chen ◽  
Xiangtian Deng ◽  
Jinrui Tang ◽  
Guorong Zhu ◽  
...  
Keyword(s):  
Power System ◽  
Wind Turbine ◽  
Low Frequency ◽  
Distributed Energy ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Oscillation Analysis ◽  
High Penetration

scholarly journals Low-frequency oscillation analysis of AC/DC system with offshore wind farm integration via MMC-based HVDC

2019 ◽  
Vol 2019 (16) ◽  
pp. 1450-1456 ◽  
Author(s):  
Zhongrui Nie ◽  
Libao Shi ◽  
Yue Zhao ◽  
Yixin Ni
Keyword(s):  
Wind Farm ◽  
Low Frequency ◽  
Offshore Wind ◽  
Offshore Wind Farm ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Dc System ◽  
Oscillation Analysis ◽  
Wind Farm Integration

New Theories and Methods of Low Frequency Oscillation Analysis under Smart Grid Framework in Electrical Engineering

2013 ◽  
Vol 676 ◽  
pp. 186-192
Author(s):  
Zhi Jian Liu ◽  
Rong Huang ◽  
Shu Ming Zhou ◽  
Yu Cheng Hou
Keyword(s):  
Smart Grid ◽  
Power System ◽  
Electrical Engineering ◽  
Low Frequency ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Oscillation Analysis ◽  
On Line ◽  
Visualization Technology ◽  
The Stability

The low-frequency oscillation is one of the most important reasons that affects the stability of the power system. Under the background of building a unified and strong smart grid, the scale of the power system will continue to expand, the interconnection of systems will be more closely, the structure will be more complex, these factors will further increase the difficulty on the low-frequency oscillation control. This paper summarizes the methods to analysis low frequency oscillation signal, the way that suppresses the low frequency oscillation in electrical engineering. Further, based on smart grid framework, a on-line visualization technology and a self-recovery regulation strategy are proposed to damp low-frequency oscillation.

Low Frequency Oscillation Analysis of VSG Grid-Connected System

2021 ◽  
Author(s):  
Guangyu Wang ◽  
Lijun Fu ◽  
Qi Hu ◽  
Fan Ma ◽  
Chenruiyang Liu ◽  
...  
Keyword(s):  
Low Frequency ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Oscillation Analysis

scholarly journals Low Frequency Oscillations in a Hydroelectric Generating System to the Variability of Wind and Solar Power

Water ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 1978
Author(s):  
Beibei Xu ◽  
Liuwei Lei ◽  
Ziwen Zhao ◽  
Wei Jiang ◽  
Shu Xiao ◽  
...  
Keyword(s):  
Transmission Line ◽  
Hybrid System ◽  
Solar Power ◽  
Low Frequency ◽  
Renewable Energies ◽  
Stable Operation ◽  
Frequency Oscillation ◽  
Low Frequency Oscillation ◽  
Oscillation Analysis ◽  
Hydropower System

The penetration of multiple integrated renewable energies to the power grid are relevant for decision making in energy policy, environment and business. Such an electricity penetration is affected by the intermittent and volatile characteristics of integrated energies, mostly significantly related to the safe and stable electricity production and supply in real world. Here, this paper focuses on the low frequency oscillation analysis of the hydropower generation response to the wind and solar variability. To enable this analysis, a hybrid model of hydropower system integrating with the wind and solar power system is presented. The Nyquist and root-locus stability methods are used to investigate the sensitivity performance of the hydropower governor to the fluctuation of the integrated renewable energies. Additionally, to quantify the risk of the hybrid system, the low frequency oscillation response of hydropower system to wind/solar/hydropower quota and transmission line distance ratio is extensively investigated in this study. The results show that under the case of the wind, solar and hydropower ratio is 40: 1: 150, the optimal values for maximally reducing hydropower low frequency oscillation are finally determined as kp = 0.8, ki = 0.25 and kd =0.5. Regarding a certain wind/solar/hydropower quota, it is a promising strategy to increase the solar-load transmission line in order to achieve the safe and stable operation of the hybrid system and a relatively excellent dynamic regulation capacity of the hydropower governor. The model, methods and results implemented in this study are exploited to markedly improve new knowledge applications, policy management, low carbon emissions and investment competitiveness of future energy systems.

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