随着风能资源的持续开发,业主对机组的要求日益增加。高海拔、大叶轮直径、更高轮毂高度的机组已成为目前风力发电投资商需求的重点。对于不同的风切变指数,风速随着高度的增加不尽相同。本文以单机容量1500 k W、叶轮直径87 m的水平轴...随着风能资源的持续开发,业主对机组的要求日益增加。高海拔、大叶轮直径、更高轮毂高度的机组已成为目前风力发电投资商需求的重点。对于不同的风切变指数,风速随着高度的增加不尽相同。本文以单机容量1500 k W、叶轮直径87 m的水平轴风力发电机组为例,在不同风切变条件下,对不同轮毂高度风机的理论发电量进行估算,并结合投资变化进行经济性分析,总结不同地区不同风切变条件下的最佳轮毂高度匹配性结果,为不同区域风电场风电机组轮毂高度选择提供前景预测。展开更多
The continuous growth of urban agglomerations in China has increased their complexity as well as vulnerability. In this context, urban resilience is critical for the healthy and sustainable development of urban agglom...The continuous growth of urban agglomerations in China has increased their complexity as well as vulnerability. In this context, urban resilience is critical for the healthy and sustainable development of urban agglomerations. Focusing on the Beijing-Tianjin-Hebei(BTH) urban agglomeration, this study constructs an urban resilience evaluation system based on four subsystems: economy, society, infrastructure, and ecology. It uses the entropy method to measure the urban resilience of the BTH urban agglomeration from 2000 to 2018.Theil index, standard deviation ellipse, and gray prediction model GM(1,1) methods are used to examine the spatio-temporal evolution and dynamic simulation of urban resilience in this urban agglomeration. Our results show that the comprehensive evaluation index for urban resilience in the BTH urban agglomeration followed a steady upward trend from 2000 to 2018,with an average annual growth rate of 6.72%. There are significant differences in each subsystem’s contribution to urban resilience;overall, economic resilience is the main factor affecting urban resilience, with an average annual growth rate of 8.06%. Spatial differences in urban resilience in the BTH urban agglomeration have decreased from 2000 to 2018, showing the typical characteristic of being greater in the central core area and lower in the surrounding non-core areas. The level of urban resilience in the BTH urban agglomeration is forecast to continue increasing over the next ten years. However, there are still considerable differences between the cities. Policy factors will play a positive role in promoting the resilience level. Based on the evaluation results, corresponding policy recommendations are put forwar to provide scientific data support and a theoretical basis for the resilience construction of the BTH urban agglomeration.展开更多
文摘随着风能资源的持续开发,业主对机组的要求日益增加。高海拔、大叶轮直径、更高轮毂高度的机组已成为目前风力发电投资商需求的重点。对于不同的风切变指数,风速随着高度的增加不尽相同。本文以单机容量1500 k W、叶轮直径87 m的水平轴风力发电机组为例,在不同风切变条件下,对不同轮毂高度风机的理论发电量进行估算,并结合投资变化进行经济性分析,总结不同地区不同风切变条件下的最佳轮毂高度匹配性结果,为不同区域风电场风电机组轮毂高度选择提供前景预测。
基金Innovation Research Group Project of National Natural Science Foundation of China,No.42121001。
文摘The continuous growth of urban agglomerations in China has increased their complexity as well as vulnerability. In this context, urban resilience is critical for the healthy and sustainable development of urban agglomerations. Focusing on the Beijing-Tianjin-Hebei(BTH) urban agglomeration, this study constructs an urban resilience evaluation system based on four subsystems: economy, society, infrastructure, and ecology. It uses the entropy method to measure the urban resilience of the BTH urban agglomeration from 2000 to 2018.Theil index, standard deviation ellipse, and gray prediction model GM(1,1) methods are used to examine the spatio-temporal evolution and dynamic simulation of urban resilience in this urban agglomeration. Our results show that the comprehensive evaluation index for urban resilience in the BTH urban agglomeration followed a steady upward trend from 2000 to 2018,with an average annual growth rate of 6.72%. There are significant differences in each subsystem’s contribution to urban resilience;overall, economic resilience is the main factor affecting urban resilience, with an average annual growth rate of 8.06%. Spatial differences in urban resilience in the BTH urban agglomeration have decreased from 2000 to 2018, showing the typical characteristic of being greater in the central core area and lower in the surrounding non-core areas. The level of urban resilience in the BTH urban agglomeration is forecast to continue increasing over the next ten years. However, there are still considerable differences between the cities. Policy factors will play a positive role in promoting the resilience level. Based on the evaluation results, corresponding policy recommendations are put forwar to provide scientific data support and a theoretical basis for the resilience construction of the BTH urban agglomeration.
