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- 저자 : Chunyang Gao (검색결과 2 건)
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A Fast High-Precision Model of the Doubly-Fed Pumped Storage Unit
Yu Xiangyang,Chunyang Gao,Nan Haipeng,Men Chuangshe,Fu Jianing 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.2
With an increase of renewable energy permeability in power grids, doubly-fed pumped storage units with excellent regulation performance have become a popular research topic. Current models of the doubly-fed pumped storage unit are mostly used in the study of electromagnetic transients while the generator model is complex and the pump-turbine system model is simple, which is not conducive to the research on electromechanical transients and pump-turbine control systems. To overcome this problem, a novel fast high-precision model of the doubly-fed pumped storage unit is proposed in this paper. First, a novel effi ciency optimization method is proposed, and a high-precision variable speed control model of the pump-turbine is established according to the pump-turbine’s complete characteristic curves of. A doubly-fed induction generator (DFIG) control model is then used to construct a detailed model of the doubly-fed pumped storage unit. The DFIG control model is analyzed and simplifi ed, and a fast high-precision model of a doubly-fed pumped storage unit is obtained. Finally, this fast high-precision model is verifi ed in the turbine and pump modes. The results indicate that compared with the detailed model, the proposed fast high-precision model can better describe the characteristics of a variable speed unit. The new model is simple, has high accuracy and its simulation step (10 −2 s) is larger than that of the detailed model (5 × 10 −6 s), which makes the simulation speed improved eff ectively.
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Hydrodynamic cavitation and its application in water treatment combined with ozonation: A review
Bing Wang,Yunxian Liu,Huan Zhang,Wen Shi,Mingyang Xiong,Chunyang Gao,Mingcan Cui 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Advanced oxidation processes (AOPs) such as cavitation and ozonation have been used as an alternativeand effective option for the treatment of wastewater with difficult to biodegrade compounds. In thisreview, the necessity and advantages of combining hydrodynamic cavitation with ozonation (HC/O3)were initially discussed. The discussion of the mechanism of the HC/O3 process revealed the presenceof both mechanical and chemical effects. Overviews of earlier work with HC/O3 technology were thensummarised to show the positive synergies and the HC devices in different wastewater treatments. Recommendations were given for parameter selection by analysing the impact of important operatingparameters on process performance. Energy efficiency and cost comparisons indicated that the HC/O3process was more cost effective than the individual process. Overall, the HC/O3 process with optimisedconditions is able to increase the degradation rate of refractory pollutants by more than 40% comparedto the HC process alone.
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