在理论分析双向FDI(Foreign Direct Investment)对经济包容性增长影响机理的基础上,利用2003~2017年中国省际面板数据,采用DEA交叉效率综合测算中国省际经济包容性增长(Inclusive Economic Growth,IEG)指数,通过构建面板向量自回归模型...在理论分析双向FDI(Foreign Direct Investment)对经济包容性增长影响机理的基础上,利用2003~2017年中国省际面板数据,采用DEA交叉效率综合测算中国省际经济包容性增长(Inclusive Economic Growth,IEG)指数,通过构建面板向量自回归模型,动态考察了双向FDI对中国经济包容性增长的影响.结果表明,样本期内中国IEG指数整体不高,且具有明显的阶段性和地区异质性;外商直接投资对中国经济包容性增长起着“绊脚石”的作用,而对外直接投资对中国经济包容性增长扮演着“助推器”的角色.展开更多
As scheduled,the 2008 Beijing Olympic torch relayed its Lhasa journey on June 21^(st).The relay in Tibet had 156 torch bearers including 75 Tibetans and covered 9.3 kilometers.
The sharp increase in the total installed capacity of natural gas generators has intensified the dynamic interaction between the electricity and natural gas systems,which could induce cascading failure propagation acr...The sharp increase in the total installed capacity of natural gas generators has intensified the dynamic interaction between the electricity and natural gas systems,which could induce cascading failure propagation across the two systems that deserves intensive research.Considering the distinct time response behaviors of the two systems,this paper discusses an integrated simulation approach to simulate the cascading failure propagation process of integrated electricity and natural gas systems(IEGSs).On one hand,considering instantaneous re-distribution of power flows after the occurrence of disturbance or failure,the steady-state AC power flow model is employed.On the other hand,gas transmission dynamics are represented by dynamic model to capture the details of its transition process.The interactions between the two systems,intensified by energy coupling components(such as gas-fired generator and electricity-driven gas compressor)as well as the switching among the operation modes of compressors during the cascading failure propagation process,are studied.An IEGS composed of the IEEE 30-bus electricity system and a 14-node 15-pipeline gas system is established to illustrate the effectiveness of the proposed simulation approach,in which two energy sub-systems are coupled by compressor and gas-fired generator.Numerical results clearly demonstrate that heterogeneous interactions between electricity and gas systems would trigger the cascading failure propagation between the two coupling systems.展开更多
As the proportion of wind power generation increases in power systems,it is necessary to develop new ways for wind power accommodation and improve the existing power dispatch model.The power-to-gas technology,which of...As the proportion of wind power generation increases in power systems,it is necessary to develop new ways for wind power accommodation and improve the existing power dispatch model.The power-to-gas technology,which offers a new approach to accommodate surplus wind power,is an excellent way to solve the former.Hence,this paper proposes to involve power-to-gas technology in the integrated electricity and natural gas systems(IEGSs).To solve the latter,on one hand,a new indicator,the scale factor of wind power integration,is introduced into the wind power stochastic model to better describe the uncertainty of grid-connected wind power;on the other hand,for quantizing and minimizing the impact of the uncertainties of wind power and system loads on system security,security risk constraints are established for the IEGS by the conditional value-at-risk method.By considering these two aspects,an MILP formulation of a security-risk based stochastic dynamic economic dispatch model for an IEGS is established,and GUROBI obtained from GAMS is used for the solution.Case studies are conducted on an IEGS consisting of a modified IEEE 39-bus system and the Belgium 20-node natural gas system to examine the effectiveness of the proposed dispatch model.展开更多
文摘在理论分析双向FDI(Foreign Direct Investment)对经济包容性增长影响机理的基础上,利用2003~2017年中国省际面板数据,采用DEA交叉效率综合测算中国省际经济包容性增长(Inclusive Economic Growth,IEG)指数,通过构建面板向量自回归模型,动态考察了双向FDI对中国经济包容性增长的影响.结果表明,样本期内中国IEG指数整体不高,且具有明显的阶段性和地区异质性;外商直接投资对中国经济包容性增长起着“绊脚石”的作用,而对外直接投资对中国经济包容性增长扮演着“助推器”的角色.
文摘As scheduled,the 2008 Beijing Olympic torch relayed its Lhasa journey on June 21^(st).The relay in Tibet had 156 torch bearers including 75 Tibetans and covered 9.3 kilometers.
基金supported by the National Natural Science Foundation of China(No.51777182)the National Natural Science Foundation(No.CMMI1635339)
文摘The sharp increase in the total installed capacity of natural gas generators has intensified the dynamic interaction between the electricity and natural gas systems,which could induce cascading failure propagation across the two systems that deserves intensive research.Considering the distinct time response behaviors of the two systems,this paper discusses an integrated simulation approach to simulate the cascading failure propagation process of integrated electricity and natural gas systems(IEGSs).On one hand,considering instantaneous re-distribution of power flows after the occurrence of disturbance or failure,the steady-state AC power flow model is employed.On the other hand,gas transmission dynamics are represented by dynamic model to capture the details of its transition process.The interactions between the two systems,intensified by energy coupling components(such as gas-fired generator and electricity-driven gas compressor)as well as the switching among the operation modes of compressors during the cascading failure propagation process,are studied.An IEGS composed of the IEEE 30-bus electricity system and a 14-node 15-pipeline gas system is established to illustrate the effectiveness of the proposed simulation approach,in which two energy sub-systems are coupled by compressor and gas-fired generator.Numerical results clearly demonstrate that heterogeneous interactions between electricity and gas systems would trigger the cascading failure propagation between the two coupling systems.
基金This work was supported by National Natural Science Foundation of China(No.51777077)Natural Science Foundation of Guangdong Province(2017A030313304).
文摘As the proportion of wind power generation increases in power systems,it is necessary to develop new ways for wind power accommodation and improve the existing power dispatch model.The power-to-gas technology,which offers a new approach to accommodate surplus wind power,is an excellent way to solve the former.Hence,this paper proposes to involve power-to-gas technology in the integrated electricity and natural gas systems(IEGSs).To solve the latter,on one hand,a new indicator,the scale factor of wind power integration,is introduced into the wind power stochastic model to better describe the uncertainty of grid-connected wind power;on the other hand,for quantizing and minimizing the impact of the uncertainties of wind power and system loads on system security,security risk constraints are established for the IEGS by the conditional value-at-risk method.By considering these two aspects,an MILP formulation of a security-risk based stochastic dynamic economic dispatch model for an IEGS is established,and GUROBI obtained from GAMS is used for the solution.Case studies are conducted on an IEGS consisting of a modified IEEE 39-bus system and the Belgium 20-node natural gas system to examine the effectiveness of the proposed dispatch model.
