The construction of intercontinental power grid interconnection projects is key to realizing the vision of Global Energy Interconnection,which is to solve global energy problems in a clean and sustainable manner.These...The construction of intercontinental power grid interconnection projects is key to realizing the vision of Global Energy Interconnection,which is to solve global energy problems in a clean and sustainable manner.These projects may be influenced by a few factors that are neither technological nor economic,such as political,social,and international factors.This paper thus presents a multi-level model for recognizing which factor from a compiled list of 14 would impact a particular intercontinental interconnection project and for assessing the degree of the factor’s influence.In the first part of the model,the Analytic Hierarchy Process(AHP)method is used to recognize the project’s most significant impact factors.Using the recognition results,the second part of the model can assess the degree of the factor’s influence on the project based on ratings provided by experts.A comprehensive evaluation can thus be provided.As a case study,the proposed Saudi Arabia-Ethiopia power grid interconnection project connecting Asia and Africa was analyzed.Derived from a combination of multiple opinions from experts,evaluations from the model will be of direct benefit to decision-makers,investors,project implementers,and engineers,providing them with a deeper insight into the project.展开更多
新疆电网以750 kV电压等级线路接入西北主网后,互联电网的动态特性、振荡模式发生了变化,新增了一个新疆电网对西北主网的区域间振荡模式。新疆内部和西北主网内部主要断面的动态稳定水平没有下降,新疆电网内部局部地区仍存在弱阻尼振...新疆电网以750 kV电压等级线路接入西北主网后,互联电网的动态特性、振荡模式发生了变化,新增了一个新疆电网对西北主网的区域间振荡模式。新疆内部和西北主网内部主要断面的动态稳定水平没有下降,新疆电网内部局部地区仍存在弱阻尼振荡模式。通过协调优化新疆电网内部北疆西部地区部分机组的励磁系统自动电压调节器(automatic voltage regulator,AVR)和电力系统稳定器(power system stabilizer,PSS)参数,可提高系统的阻尼水平,并在一定程度上解决了该地区水电窝电现象。开展了实际互联电网系统扰动试验,实测数据验证了仿真计算结果的准确性,通过扰动试验掌握了互联电网的动态特性和系统阻尼水平。研究综合运用了时域和频域的方法,并以频率计算为主,辅以时域分析校验。展开更多
海底电缆过电压与绝缘配合问题是跨海电力联网工程设计的重要内容,也是开展海底电缆结构设计的前提[1]。南方主网与海南电网联网工程是我国首条、世界第二条500 k V交流海底电缆,其绝缘配合设计直接关系到工程运行安全性和总投资,故而...海底电缆过电压与绝缘配合问题是跨海电力联网工程设计的重要内容,也是开展海底电缆结构设计的前提[1]。南方主网与海南电网联网工程是我国首条、世界第二条500 k V交流海底电缆,其绝缘配合设计直接关系到工程运行安全性和总投资,故而尤为重要。从联网系统工频过电压、操作过电压和雷电过电压的角度,对海底电缆可能出现的各种过电压水平进行分析和仿真计算,根据计算结果对系统、一次主接线提出降低海底电缆过电压的措施。结合电缆过电压水平,计算电缆所需的绝缘厚度值,并对工频耐受电压、冲击耐受电压水平进行校核。最后,对提高海底电缆绝缘安全性能的措施提出建议,研究结果可为其他海底电缆工程的设计提供参考。展开更多
基金supported by the State Grid Science and Technology Project“Research on Method and Evaluation Principle for the Cross-Continent Power Transmission Planning Scheme”(SGTYHT/16-JS-198)。
文摘The construction of intercontinental power grid interconnection projects is key to realizing the vision of Global Energy Interconnection,which is to solve global energy problems in a clean and sustainable manner.These projects may be influenced by a few factors that are neither technological nor economic,such as political,social,and international factors.This paper thus presents a multi-level model for recognizing which factor from a compiled list of 14 would impact a particular intercontinental interconnection project and for assessing the degree of the factor’s influence.In the first part of the model,the Analytic Hierarchy Process(AHP)method is used to recognize the project’s most significant impact factors.Using the recognition results,the second part of the model can assess the degree of the factor’s influence on the project based on ratings provided by experts.A comprehensive evaluation can thus be provided.As a case study,the proposed Saudi Arabia-Ethiopia power grid interconnection project connecting Asia and Africa was analyzed.Derived from a combination of multiple opinions from experts,evaluations from the model will be of direct benefit to decision-makers,investors,project implementers,and engineers,providing them with a deeper insight into the project.
文摘新疆电网以750 kV电压等级线路接入西北主网后,互联电网的动态特性、振荡模式发生了变化,新增了一个新疆电网对西北主网的区域间振荡模式。新疆内部和西北主网内部主要断面的动态稳定水平没有下降,新疆电网内部局部地区仍存在弱阻尼振荡模式。通过协调优化新疆电网内部北疆西部地区部分机组的励磁系统自动电压调节器(automatic voltage regulator,AVR)和电力系统稳定器(power system stabilizer,PSS)参数,可提高系统的阻尼水平,并在一定程度上解决了该地区水电窝电现象。开展了实际互联电网系统扰动试验,实测数据验证了仿真计算结果的准确性,通过扰动试验掌握了互联电网的动态特性和系统阻尼水平。研究综合运用了时域和频域的方法,并以频率计算为主,辅以时域分析校验。
文摘海底电缆过电压与绝缘配合问题是跨海电力联网工程设计的重要内容,也是开展海底电缆结构设计的前提[1]。南方主网与海南电网联网工程是我国首条、世界第二条500 k V交流海底电缆,其绝缘配合设计直接关系到工程运行安全性和总投资,故而尤为重要。从联网系统工频过电压、操作过电压和雷电过电压的角度,对海底电缆可能出现的各种过电压水平进行分析和仿真计算,根据计算结果对系统、一次主接线提出降低海底电缆过电压的措施。结合电缆过电压水平,计算电缆所需的绝缘厚度值,并对工频耐受电压、冲击耐受电压水平进行校核。最后,对提高海底电缆绝缘安全性能的措施提出建议,研究结果可为其他海底电缆工程的设计提供参考。
