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2 results on '"Jianqiang Xiang"'

1. Multi-scenario flexibility assessment of power systems considering renewable energy output uncertainty

Author

Qing Ai, Jianqiang Xiang, Yaolin Liu, Luguang Qu, Jinchao Cao, Xiangnan Li, and Yingge Wang

Subjects
renewable energy, power system flexibility, evaluation model, resource scheduling, hierarchical cluster analysis, General Works
Abstract

The widespread adoption of renewable energy sources presents a significant challenge to the flexibility of power system. To assess the flexibility of the power system in scenarios with uncertain renewable energy output, it is crucial to quantify it quantitatively. This evaluation plays a vital role in planning flexible regulatory resources and dispatching resources for both the energy source and load. This study introduces a novel flexibility assessment model tailored for power grids with high renewable energy penetration, specifically addressing uncertainty associated with wind and PV. By analyzing the impact of wind and PV uncertainty on system flexibility, the paper proposes an improved cohesive hierarchical cluster analysis method, incorporating reliability considerations based on the Davies-Bouldin classification reliability index. Additionally, the study develops models for flexibility resources and demands within high renewable energy power systems, along with quantitative assessment indicators across three key aspects. Through a structured flexibility assessment process accounting for wind and PV uncertainty, the effectiveness of the proposed approach is validated using real-world data from a renewable energy power grid in Shandong province. A set of typical renewable energy output scenarios with uncertainty is constructed using the improved hierarchical cluster analysis method. The study then analyses the impact of different wind and PV penetration rates and the proportion of energy storage units on system flexibility by the flexibility assessment model to validate the proposed method's effectiveness.

Published
2024
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2. 21 cases of laparoscopic central pancreatectomy

Author

Jianqiang Xiang, Jie Zhu, Haibiao Wang, Xinhua Zhou, and Hong Li

Abstract

Objective: To investigate the experience of laparoscopic central pancreatectomy. Methods: The perioperative data of 21 patients who underwent laparoscopiccentral pancreatectomy were retrospectively analyzed from September 2017 to November 2022 in Ningbo Medical Center Lihuili Hospital (Xingning Branch and Eastern Branch). According to these data, we summarized the treatment experience of laparoscopic central pancreatectomy. Results: All the operations were successfully completed without intraoperative conversion to open surgery. In these operations, intraoperative blood transfusion was in 1 case, intraoperative cholangiography was performed in 2 cases, and intraoperative fluoroscopic laparoscopic assistance was performed in 4 cases. The operative time ranged from 140-560 min (average 221.5min), and the estimated intraoperative bleeding volume ranged from 50-800 ml (average 180.9 ml). Postoperative pathology confirmed that 5 cases were intraductal papillary mucinous neoplasm, 6 cases were serous cystic neoplasms, 3 cases were mucinous cystic neoplasms, 3 cases weresolid pseudopapillary neoplasms, 3 cases were neuroendocrine tumors and 1 case was pancreatic ductal adenocarcinoma. The maximum tumor diameter ranged from 1.0-8.5 cm (average 2.9 cm).There was no one case of postoperative common bile duct stenosis and biliaryleakage. Among them, there were 4 cases of biochemical leakage, 15 cases of grade B pancreatic fistula, and 2 cases of grade C pancreatic fistula. Conclusion: As a procedure for preserving pancreatic function, laparoscopic central pancreatectomy had certain surgical risks and a high probability of postoperative pancreatic fistula whichshould be performed by experienced surgeons. Ethical approval number: KY2022SL213-01

Published
2023

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