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437 results on '"Wu, Yunna"'

1. Multi-Scenario Progressive Planning Optimization of Shared Energy Storage Under Dual-Carbon Goals

Author

ZHANG Ting, MA Yuze, WU Yunna

Subjects
shared energy storage, progressive planning optimization, multi-flexible adjustment resource coupling, multi-scenario analysis, new power system, Science, Production of electric energy or power. Powerplants. Central stations, TK1001-1841
Abstract

Guided by the goal of carbon neutrality，the optimization of shared energy-storage planning has become key for solving （i） the volatility and uncertainty of power supply for new power systems with new energy as the main body and （ii） the mismatch with user demands. Therefore，based on a comprehensive analysis of the physical characteristics，operation characterization function，and cost-benefit model of typical flexibility-regulation resources of new power systems，this study performs a characteristic analysis of system flexibility-regulation demand as guidance and aims to maximize the social welfare of flexibility regulation. The operation strategy and progressive planning-optimization model for six scenarios of lithium battery-supercapacitor shared energy-storage system under the coordination of multiple flexible-regulation resources，such as smoothing fluctuations，peaking and valley filling，alleviating transmission and distribution circuit congestion and delaying grid upgrading，reducing wind and power rejection，achieving supply-and-demand balance，and reducing load cutting，are proposed. Additionally，a scientific and effective solution method is proposed to facilitate the dynamic construction of new power systems. Numerical results show that the proposed model can improve the absorption level of renewable energy and effectively reduce the system flexibility-adjustment cost.

Published
2025
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33. Aridity-dependent resistance but strong resilience of grassland ANPP to naturally occurring precipitation extremes.

Author

Ning, Shijie, Yan, Tao, Luo, Wentao, Tao, Shengli, Zou, Xiaoming, Li, Yujiang, Shangguan, Zijian, Wu, Yunna, Zhang, Zhenhua, and He, Jin-Sheng

Subjects
CLIMATE extremes, LIFE history theory, ARID regions, PLANT anatomy, PLANT communities, GRASSLANDS
Abstract

Increasing intensity and frequency of climate extremes under climate change are expected to affect rainfall-constrained ecosystems, particularly grassland ecosystems in arid and semi-arid zones. However, our understanding of the effects of precipitation extremes (extreme drought or wetness) on grassland productivity, especially under naturally occurring conditions, remains limited. Here, we assembled a dataset of aboveground net primary productivity (ANPP) measurements from long-term (26–54 years) observational studies conducted in 13 grasslands worldwide to investigate the direct and legacy responses of grassland ANPP to naturally occurring precipitation extremes. We further examined changes in plant community structure (species richness, life history, growth form and photosynthetic pathway) before, during and after precipitation extremes. We found that extreme drought decreased ANPP by an average of 40%, while extreme wetness had a neutral effect on ANPP. The direct effects of both extreme drought and wetness on ANPP were aridity-dependent, with grassland vulnerability increasing with site aridity. However, we did not detect widespread legacy effects of extreme drought or wetness on ANPP. This is mainly attributable to reorganized plant community structure, which favored rapid recovery of community biomass. The aridity-dependent response of ANPP to precipitation extremes demonstrates the ambient climate-dependent resistance of grasslands to these events. Moreover, the minimal legacy effects of precipitation extremes on ANPP highlight the strong resilience of grasslands. These findings underscore the importance of integrating extreme climate conditions into forecasts of future grassland productivity and stability in a changing climate. [ABSTRACT FROM AUTHOR]

Published
2024
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