Internal effects of the dynamic behaviors and nonlinear characteristics of a coupled fractional order hydropower generation system(HGS) are analyzed. A mathematical model of hydro-turbine governing system(HTGS) with r...Internal effects of the dynamic behaviors and nonlinear characteristics of a coupled fractional order hydropower generation system(HGS) are analyzed. A mathematical model of hydro-turbine governing system(HTGS) with rigid water hammer and hydro-turbine generator unit(HTGU) with fractional order damping forces are proposed. Based on Lagrange equations, a coupled fractional order HGS is established. Considering the dynamic transfer coefficient eis variational during the operation, introduced e as a periodic excitation into the HGS. The internal relationship of the dynamic behaviors between HTGS and HTGU is analyzed under different parameter values and fractional order. The results show obvious fast–slow dynamic behaviors in the HGS, causing corresponding vibration of the system, and some remarkable evolution phenomena take place with the changing of the periodic excitation parameter values.展开更多
Water is a recyclable resource and the largest energy carrier on Earth.New hydropower generation technologies hold great promise for the future.However,there is a lack of evaluation standards for power generation perf...Water is a recyclable resource and the largest energy carrier on Earth.New hydropower generation technologies hold great promise for the future.However,there is a lack of evaluation standards for power generation performance.And,the mechanism of hydrovoltaic power generation lacks systematic clarity.In this study,a thermodynamic analysis method about hot and humid air energy conversion based on the principle of hydropower generation is established.To author's knowledge,it is the first time that the maximum available energy of hydropower generation is analyzed by exergy and parametric calculations.The greater the difference,the higher the available energy.Also,a series of experiments were conducted to explore the power generation device materials,structural composition,and structural parameters,further clarifying the principle of electricity generation.And,the influence of temperature and relative humidity on the power generation performance was also studied.The increase in temperature can effectively increase the output electrical performance of the power generation.The open-circuit voltage and short-circuit current of water evaporation power generation with Al_(2)O_(3)nanoparticles are higher than 2.5 V and 150 nA respectively.Through analysis,we propose relevant application strategies to provide theoretical and practical support for the development of green energy.展开更多
基金Project supported by the National Natural Science Foundation of China for Outstanding Youth(Grant No.51622906)the National Natural Science Foundation of China(Grant No.51479173)+2 种基金the Fundamental Research Funds for the Central Universities(Grant No.201304030577)the Scientific Research Funds of Northwest A&F University(Grant No.2013BSJJ095)the Science Fund for Excellent Young Scholars from Northwest A&F University and Shaanxi Nova Program,China(Grant No.2016KJXX-55)
文摘Internal effects of the dynamic behaviors and nonlinear characteristics of a coupled fractional order hydropower generation system(HGS) are analyzed. A mathematical model of hydro-turbine governing system(HTGS) with rigid water hammer and hydro-turbine generator unit(HTGU) with fractional order damping forces are proposed. Based on Lagrange equations, a coupled fractional order HGS is established. Considering the dynamic transfer coefficient eis variational during the operation, introduced e as a periodic excitation into the HGS. The internal relationship of the dynamic behaviors between HTGS and HTGU is analyzed under different parameter values and fractional order. The results show obvious fast–slow dynamic behaviors in the HGS, causing corresponding vibration of the system, and some remarkable evolution phenomena take place with the changing of the periodic excitation parameter values.
基金supported by the Tsinghua University China Mobile Communication Group Co.,Ltd.Joint Research Institute Project(20232930009)。
文摘Water is a recyclable resource and the largest energy carrier on Earth.New hydropower generation technologies hold great promise for the future.However,there is a lack of evaluation standards for power generation performance.And,the mechanism of hydrovoltaic power generation lacks systematic clarity.In this study,a thermodynamic analysis method about hot and humid air energy conversion based on the principle of hydropower generation is established.To author's knowledge,it is the first time that the maximum available energy of hydropower generation is analyzed by exergy and parametric calculations.The greater the difference,the higher the available energy.Also,a series of experiments were conducted to explore the power generation device materials,structural composition,and structural parameters,further clarifying the principle of electricity generation.And,the influence of temperature and relative humidity on the power generation performance was also studied.The increase in temperature can effectively increase the output electrical performance of the power generation.The open-circuit voltage and short-circuit current of water evaporation power generation with Al_(2)O_(3)nanoparticles are higher than 2.5 V and 150 nA respectively.Through analysis,we propose relevant application strategies to provide theoretical and practical support for the development of green energy.
