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Article

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

by 1,2,3, 1,2, 1,2, 1,2,*, 1,2, 1,2, 3 and 1,2,*
1
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A&F University, Yangling 712100, China
2
Institute of Water Resources and Hydropower Research, Northwest A&F University, Yangling 712100, China
3
Powerchina Northwest Engineering Corporation Limited, Xi’an 710065, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Diego Vicinanza
Water 2021, 13(14), 1978; https://doi.org/10.3390/w13141978
Received: 18 June 2021 / Revised: 11 July 2021 / Accepted: 11 July 2021 / Published: 19 July 2021
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. View Full-Text
Keywords: hybrid system; hydropower; low frequency oscillation; dynamic stability; wind farm; solar energy hybrid system; hydropower; low frequency oscillation; dynamic stability; wind farm; solar energy
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MDPI and ACS Style

Xu, B.; Lei, L.; Zhao, Z.; Jiang, W.; Xiao, S.; Li, H.; Zhang, J.; Chen, D. Low Frequency Oscillations in a Hydroelectric Generating System to the Variability of Wind and Solar Power. Water 2021, 13, 1978. https://doi.org/10.3390/w13141978

AMA Style

Xu B, Lei L, Zhao Z, Jiang W, Xiao S, Li H, Zhang J, Chen D. Low Frequency Oscillations in a Hydroelectric Generating System to the Variability of Wind and Solar Power. Water. 2021; 13(14):1978. https://doi.org/10.3390/w13141978

Chicago/Turabian Style

Xu, Beibei, Liuwei Lei, Ziwen Zhao, Wei Jiang, Shu Xiao, Huanhuan Li, Junzhi Zhang, and Diyi Chen. 2021. "Low Frequency Oscillations in a Hydroelectric Generating System to the Variability of Wind and Solar Power" Water 13, no. 14: 1978. https://doi.org/10.3390/w13141978

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