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- 저자 : Yusheng Cheng (검색결과 3 건)
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Passivity‑based control strategy for hexagonal converter under unbalanced power grid
Yusheng Lai,Qiming Cheng,Xin Zhang 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.4
When a hexagonal converter (Hexverter) is applied to high-power renewable energy generation such as offshore low-frequencytransmission, using traditional PID control to ensure the stable global operation and strong robustness of the system is difficult due to the random fluctuation of renewable energy, system parameter uptake, its non-linear characteristics, and the possible unbalanced grid situation. This paper proposes a non-linear passivity-based control (PBC) strategy for Hexverter under an unbalanced grid. First, the passivity and stability of Hexverter objects are analyzed based on PBC theory. The unbalanced PBC strategy of Hexverter is then designed and derived. Three control objectives are designed according to different control requirements. Finally, the simulation system of the Hexverter under an unbalanced grid is built on Matlab/ Simulink to verify the effectiveness and superiority of the proposed unbalanced PBC method. The simulation results show that the proposed method has fewer control parameters, faster response, lower harmonic content, and better overall control effect than PID control.
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Lei Zhang,Yusheng Cheng,Huizi Li,Yufeng Zhou,Bo Sun,Leibo Xu 대한외과학회 2018 Annals of Surgical Treatment and Research(ASRT) Vol.95 No.1
Purpose: Intestinal dysfunction is one of the most common complications in patients after abdominal surgery. Daikenchuto (DKT), a traditional herbal medicine, is recently employed to improve postoperative intestinal dysfunction. The aim of this meta-analysis was to assess the efficacy of DKT in improving intestinal dysfunction after abdominal surgery. Methods: PubMed, Embase, and the Cochrane library were systematically searched to identify randomized controlled trails (RCTs) in adult patients undergoing abdominal surgery, who were randomly distributed to administrate DKT and placebo. The primary outcomes included the time to first postoperative flatus or bowel movement. We used random-effects models to calculate summary mean differences (MDs) with 95% confidence intervals (CIs). Results: Nine RCTs totaling 1,212 patients (618 in DKT, 594 in control group) were included in our study. Compared with control group, DKT can effectively improve postoperative intestinal dysfunction by shortening the time to first postoperative flatus (MD, -0.41; 95% confidence interval [CI], -0.66 to -0.16; P = 0.001) with significant heterogeneity (I<SUP>2</SUP> = 71%, P = 0.004), and bowel movement (MD, -0.65; 95% CI, -0.97 to -0.32; P < 0.001) without significant heterogeneity (I<SUP>2</SUP> = 40%, P = 0.14). Sensitivity analyses by indication of surgery and type of surgery yielded similar results. Conclusion: These data provide limited evidence that DKT shows efficacy on improving intestinal dysfunction after abdominal surgery. However, the results should be interpreted cautiously, due to the heterogeneity of the studies included. Thus, the efficacy of DKT on improving postoperative intestinal dysfunction warrants further investigation.
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Yu, Sheng,Zhang, Baoxian,Yao, Zheng,Li, Cheng Korean Society for Internet Information 2016 KSII Transactions on Internet and Information Syst Vol.10 No.12
Designing efficient routing protocols for a wireless sensor network with mobile sinks (mWSN) is a challenging task since the network topology and data paths change frequently as sink nodes move. In this paper, we design a novel lightweight reactive ring based routing protocol called R3, which removes the need of proactively maintaining data paths to mobile sinks as they move in the network. To achieve high packet delivery ratio and low transmission cost, R3 combines ring based forwarding and trail based forwarding together. To support efficient ring based forwarding, we build a ring based structure for a network in a way such that each node in the network can easily obtain its ring ID and virtual angle information. For this purpose, we artificially create a virtual hole in the central area of the network and accordingly find a shortest cycled path enclosing the hole, which serves as base ring and is used for generating the remaining ring based structure. We accordingly present the detailed design description for R3, which only requires each node to keep very limited routing information. We derive the communication overhead by ring based forwarding. Extensive simulation results show that R3 can achieve high routing performance as compared with existing work.
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