Coordinated development is a major concern in the construction strategy of the Yangtze River Economic Belt (YREB).However,there were few studies which have quantitatively measured the level of coordinated development ...Coordinated development is a major concern in the construction strategy of the Yangtze River Economic Belt (YREB).However,there were few studies which have quantitatively measured the level of coordinated development in the YREB.This paper aimed to propose an comprehensive index system of coordinated development based on the theories of growth pole and complex ecosystem and new guidelines of development from the central government.The index system was composed by 18 indicators within 4 domains including economic development,technology & innovation,communication & transportation,and ecological protection.The scores of coordinated development capability of the 110 prefecture-level cities in the YREB were calculated and examined using natural break point analysis,spatial autocorrelation analysis and rank-size analysis.It was shown that Shanghai,Nanjing and Wuhan were leading the coordinated development in the YREB.Generally,the scores of coordinated development capability were higher in the eastern region of the YREB,in which the cities performed well in the domains of economic development,technology & innovation and communication & transportation yet showed poor performance in ecological protection.Most cities in the middle reaches of Yangtze river ranked in the middle in the YREB in all the domains,except the provincial capitals.The western region of the YREB got the lowest score in the coordinated development capability besides the largest cities such as Chongqing,Chengdu,Kunming and Guiyang.The correlation coefficients between ecological protection and other domains were very low,suggesting that few cities have achieved a win-win situation between environment protection and socio-economic development.We suggested 3 ways to promote coordinated development in the YREB:establish multi-level institutional designs;enhance the innovation in green industries;and strengthen the joint prevention and control of ecological risks.展开更多
光伏电站汇流网络的阻抗分布复杂,与静止无功发生装置(static var generator,SVG)及电网阻抗交互作用引发的高频谐振问题机理不明,且缺乏有效的高频谐振抑制措施,频发的高频谐振问题已威胁到了光伏并网系统的安全稳定运行。论文针对含...光伏电站汇流网络的阻抗分布复杂,与静止无功发生装置(static var generator,SVG)及电网阻抗交互作用引发的高频谐振问题机理不明,且缺乏有效的高频谐振抑制措施,频发的高频谐振问题已威胁到了光伏并网系统的安全稳定运行。论文针对含静止无功装置的光伏电站高频谐振机理及其振荡抑制措施开展研究工作。首先,建立光伏电站统一阻抗模型,分析光伏电站中各装置阻抗的高频影响因素,并建立高频特征阻抗模型;然后,通过构建光伏电站的序阻抗网络,将光伏电站等效聚合为源–载阻抗系统,分析光伏电站高频谐振的形成机理及其影响因素;提出一种基于SVG高频阻抗重塑的光伏电站谐振抑制方法,通过SVG高频相角补偿实现光伏电站高频振荡的有效抑制,并给出参数整定方法;最后,采用RT-LAB控制硬件在环完成高频振荡机理分析及其抑制控制的实验验证。展开更多
基金Sponsored by General Program of China National Natural Science Foundation(41771143)Major Projects of Key Research Bases of Humanities and Social Sciences of the Ministry of Education(17JJD790006)Special Research Project of National Key Research and Development Plan(2016YFC0502701).
文摘Coordinated development is a major concern in the construction strategy of the Yangtze River Economic Belt (YREB).However,there were few studies which have quantitatively measured the level of coordinated development in the YREB.This paper aimed to propose an comprehensive index system of coordinated development based on the theories of growth pole and complex ecosystem and new guidelines of development from the central government.The index system was composed by 18 indicators within 4 domains including economic development,technology & innovation,communication & transportation,and ecological protection.The scores of coordinated development capability of the 110 prefecture-level cities in the YREB were calculated and examined using natural break point analysis,spatial autocorrelation analysis and rank-size analysis.It was shown that Shanghai,Nanjing and Wuhan were leading the coordinated development in the YREB.Generally,the scores of coordinated development capability were higher in the eastern region of the YREB,in which the cities performed well in the domains of economic development,technology & innovation and communication & transportation yet showed poor performance in ecological protection.Most cities in the middle reaches of Yangtze river ranked in the middle in the YREB in all the domains,except the provincial capitals.The western region of the YREB got the lowest score in the coordinated development capability besides the largest cities such as Chongqing,Chengdu,Kunming and Guiyang.The correlation coefficients between ecological protection and other domains were very low,suggesting that few cities have achieved a win-win situation between environment protection and socio-economic development.We suggested 3 ways to promote coordinated development in the YREB:establish multi-level institutional designs;enhance the innovation in green industries;and strengthen the joint prevention and control of ecological risks.
文摘光伏电站汇流网络的阻抗分布复杂,与静止无功发生装置(static var generator,SVG)及电网阻抗交互作用引发的高频谐振问题机理不明,且缺乏有效的高频谐振抑制措施,频发的高频谐振问题已威胁到了光伏并网系统的安全稳定运行。论文针对含静止无功装置的光伏电站高频谐振机理及其振荡抑制措施开展研究工作。首先,建立光伏电站统一阻抗模型,分析光伏电站中各装置阻抗的高频影响因素,并建立高频特征阻抗模型;然后,通过构建光伏电站的序阻抗网络,将光伏电站等效聚合为源–载阻抗系统,分析光伏电站高频谐振的形成机理及其影响因素;提出一种基于SVG高频阻抗重塑的光伏电站谐振抑制方法,通过SVG高频相角补偿实现光伏电站高频振荡的有效抑制,并给出参数整定方法;最后,采用RT-LAB控制硬件在环完成高频振荡机理分析及其抑制控制的实验验证。
