An anti-corona method for the power transmission lines is proposed in this paper. The RTV coating is used as the anti-corona coating, which is spaying onto the surface of the wearing conductor. The corona characterist...An anti-corona method for the power transmission lines is proposed in this paper. The RTV coating is used as the anti-corona coating, which is spaying onto the surface of the wearing conductor. The corona characteristic of the conductor test was done, and the corona onset voltage increase after the spraying of the anti-corona layer, the corona loss in the same voltage decrease, which could prove the excellent effect of improving the corona characteristic of the conductor. This anti-corona method will have great prospect, based on the background of the construction of UHV power transmission lines.展开更多
Employing even higher voltage level to promote power transmission economy is an important subject in the program of power transmission from west to east. The influence of electro-magnetic environment of transmission p...Employing even higher voltage level to promote power transmission economy is an important subject in the program of power transmission from west to east. The influence of electro-magnetic environment of transmission project being closely related with human health and construction cost has to be seriously considered before advancing transmission voltage. This paper analyzes and discusses overseas and domestic research achievements on radio interference, audible noise, power frequency electric field, power frequency magnetic fields, DC resultant field intensity and ion stream involved in power transmission at ultra-high-voltage (UHV)AC and ± 800 kV DC or even higher voltage levels. Suggestions on limiting electro-magnetic effects and their ceiling value as well as measures to improve electro-magnetic environment are put forward.展开更多
A unified power flow controller(UPFC)combines the advantages of various flexible alternating current transmission system(FACTS)devices into a powerful format.Using a 500 kV power grid,this study evaluates the selectio...A unified power flow controller(UPFC)combines the advantages of various flexible alternating current transmission system(FACTS)devices into a powerful format.Using a 500 kV power grid,this study evaluates the selection and use of a UPFC to improve transmission capacity.The"UPFC unit capacity control proportionality coefficient"is introduced to quantify the control effect of the UPFC,and an optimal calculation method for the UPFC capacity is presented.Following the proposal of a UPFC site selection process,the data of an existing power grid is used to conduct simulations.The simulation results show that the UPFC has a strong ability to improve transmission capacity,and its use is greatly advantageous.Additionally,by applying the proposed selection method,the control effect and economic benefits of the UPFC can be comprehensively considered during project site selection.These findings have a guiding significance for UPFC site selection in ultra-high voltage power grids.展开更多
China needs to develop a strong national power grid which takes ultra-high-voltage (UHV) transmission systems as its core. The grid is expected to adopt 1000-kV-class AC and ± 800-kV DC transmission systems. In v...China needs to develop a strong national power grid which takes ultra-high-voltage (UHV) transmission systems as its core. The grid is expected to adopt 1000-kV-class AC and ± 800-kV DC transmission systems. In view of significant achievements in technological research and considerable progress in UHV manufacturing technology, China is capable of developing UHV systems. In order to promote the construction of UHV systems,China Electric Power Research Institute and other institutions have initiated first-phase research activities of UHV transmission technologies. The main contents involve research on UHV transmission technology and its economy,developing and manufacturing abilities on UHV equipment, prospective of UHV network frame and selection of demonstration projects, etc.展开更多
特高压工程大规模建设,核心装备是关键。为促进特高压交流输电技术的进一步发展,对特高压交流变压器、气体绝缘金属封闭开关设备(GIS)、串联补偿装置和避雷器等关键装备的最新技术发展进行了总结和展望。结果表明:特高压变压器应选择局...特高压工程大规模建设,核心装备是关键。为促进特高压交流输电技术的进一步发展,对特高压交流变压器、气体绝缘金属封闭开关设备(GIS)、串联补偿装置和避雷器等关键装备的最新技术发展进行了总结和展望。结果表明:特高压变压器应选择局部放电概率为1‰时的电场强度允许值作为许用场强;采用器身端部磁屏蔽、油箱电屏蔽、油箱磁屏蔽、采用不导磁钢板等漏磁控制措施可有效降低1 500 MVA大容量特高压变压器的漏磁和温升;特高压断路器的开断能力可达63 k A,采用基于"三回路法"的合成试验回路可突破试验设备限制,完成1 100 k V断路器开断试验;明确了通过在"立式"隔离开关静触头侧安装阻尼电阻来限制VFTO的幅值和频率;提出了从持续运行电压的角度出发,特高压避雷器的额定电压降低到780 k V是安全的。未来特高压交流输变电装备应在高可靠性、大容量、新工作原理和性能参数优化等方面进行深入研究。展开更多
哈郑特高压直流是我国首个大容量风火打捆直流外送工程,送端电网存在多种安全稳定问题。分析了直流运行特性,提出了过渡期联网运行和孤岛运行的条件。研究了弱送端电网不平衡功率分配特性,为故障后保障重要交流通道安全稳定控制策略的...哈郑特高压直流是我国首个大容量风火打捆直流外送工程,送端电网存在多种安全稳定问题。分析了直流运行特性,提出了过渡期联网运行和孤岛运行的条件。研究了弱送端电网不平衡功率分配特性,为故障后保障重要交流通道安全稳定控制策略的制定奠定了基础。研究了特高压直流输电系统与750 k V交流电网耦合特性,指出配套火电的投运将使吐哈断面稳定问题由动态稳定转变为暂态稳定,二通道同时存在电压大幅波动和暂态稳定问题,给出了故障约束下特高压直流与二通道输电能力。分析了直流对青藏直流及藏中电网频率稳定的影响规律,研究了风火不同比例下直流故障引起的电压波动问题,为西北电网的运行控制提供了参考依据。展开更多
文摘An anti-corona method for the power transmission lines is proposed in this paper. The RTV coating is used as the anti-corona coating, which is spaying onto the surface of the wearing conductor. The corona characteristic of the conductor test was done, and the corona onset voltage increase after the spraying of the anti-corona layer, the corona loss in the same voltage decrease, which could prove the excellent effect of improving the corona characteristic of the conductor. This anti-corona method will have great prospect, based on the background of the construction of UHV power transmission lines.
文摘Employing even higher voltage level to promote power transmission economy is an important subject in the program of power transmission from west to east. The influence of electro-magnetic environment of transmission project being closely related with human health and construction cost has to be seriously considered before advancing transmission voltage. This paper analyzes and discusses overseas and domestic research achievements on radio interference, audible noise, power frequency electric field, power frequency magnetic fields, DC resultant field intensity and ion stream involved in power transmission at ultra-high-voltage (UHV)AC and ± 800 kV DC or even higher voltage levels. Suggestions on limiting electro-magnetic effects and their ceiling value as well as measures to improve electro-magnetic environment are put forward.
基金supported by State Grid Corporation’s Science and Technology Project“Research and Demonstration of Technical Measures for Improving Voltage Supporting Capacity of Large-scale Urban Power Grid”(52094016000Y)
文摘A unified power flow controller(UPFC)combines the advantages of various flexible alternating current transmission system(FACTS)devices into a powerful format.Using a 500 kV power grid,this study evaluates the selection and use of a UPFC to improve transmission capacity.The"UPFC unit capacity control proportionality coefficient"is introduced to quantify the control effect of the UPFC,and an optimal calculation method for the UPFC capacity is presented.Following the proposal of a UPFC site selection process,the data of an existing power grid is used to conduct simulations.The simulation results show that the UPFC has a strong ability to improve transmission capacity,and its use is greatly advantageous.Additionally,by applying the proposed selection method,the control effect and economic benefits of the UPFC can be comprehensively considered during project site selection.These findings have a guiding significance for UPFC site selection in ultra-high voltage power grids.
文摘China needs to develop a strong national power grid which takes ultra-high-voltage (UHV) transmission systems as its core. The grid is expected to adopt 1000-kV-class AC and ± 800-kV DC transmission systems. In view of significant achievements in technological research and considerable progress in UHV manufacturing technology, China is capable of developing UHV systems. In order to promote the construction of UHV systems,China Electric Power Research Institute and other institutions have initiated first-phase research activities of UHV transmission technologies. The main contents involve research on UHV transmission technology and its economy,developing and manufacturing abilities on UHV equipment, prospective of UHV network frame and selection of demonstration projects, etc.
文摘特高压工程大规模建设,核心装备是关键。为促进特高压交流输电技术的进一步发展,对特高压交流变压器、气体绝缘金属封闭开关设备(GIS)、串联补偿装置和避雷器等关键装备的最新技术发展进行了总结和展望。结果表明:特高压变压器应选择局部放电概率为1‰时的电场强度允许值作为许用场强;采用器身端部磁屏蔽、油箱电屏蔽、油箱磁屏蔽、采用不导磁钢板等漏磁控制措施可有效降低1 500 MVA大容量特高压变压器的漏磁和温升;特高压断路器的开断能力可达63 k A,采用基于"三回路法"的合成试验回路可突破试验设备限制,完成1 100 k V断路器开断试验;明确了通过在"立式"隔离开关静触头侧安装阻尼电阻来限制VFTO的幅值和频率;提出了从持续运行电压的角度出发,特高压避雷器的额定电压降低到780 k V是安全的。未来特高压交流输变电装备应在高可靠性、大容量、新工作原理和性能参数优化等方面进行深入研究。
文摘哈郑特高压直流是我国首个大容量风火打捆直流外送工程,送端电网存在多种安全稳定问题。分析了直流运行特性,提出了过渡期联网运行和孤岛运行的条件。研究了弱送端电网不平衡功率分配特性,为故障后保障重要交流通道安全稳定控制策略的制定奠定了基础。研究了特高压直流输电系统与750 k V交流电网耦合特性,指出配套火电的投运将使吐哈断面稳定问题由动态稳定转变为暂态稳定,二通道同时存在电压大幅波动和暂态稳定问题,给出了故障约束下特高压直流与二通道输电能力。分析了直流对青藏直流及藏中电网频率稳定的影响规律,研究了风火不同比例下直流故障引起的电压波动问题,为西北电网的运行控制提供了参考依据。
