±800 kV特高压直流大跨越悬垂绝缘子串均压方案优化
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摘要
绝缘子串表面的场强和电位分布存在明显的不均匀性,目前国内外进行的相关研究多集中在超高压及特高压交流领域,对直流线路的相关研究较少。加之直流线路大跨越工程并不常见,国内外对直流线路大跨越超长复杂绝缘子串电场及电位分布的系统研究较为缺乏。在现有最新研究成果的基础上,建立三维有限元模型,系统分析均压环的参数变化对均压效果的影响,综合考虑均压环参数对沿绝缘子串表面的场强、整串绝缘性能及工程造价的影响,初步选定均压环的优化方案,最后采用多变量有约束的最优化理论,选定最优的均压方案。研究结果表明,优化后单片绝缘子承受的最大电压降低约5. 7%。
The distribution of electric field and potential along the insulator string is obvious uneven. At present,the domestic and foreign researches mainly focus on the EHV and UHV AC line. However,the HVDC large crossing transmission line is not very common,so there is a lack of systematic research on the electric field and potential distribution of large crossing and complex insulator strings. Based on the latest research results,this paper establishes three-dimensional finite element model and research the influence of grading ring parameters,considering the influence of insulator surface field strength,the insulation performance and the cost of the project construction,this paper preliminary select optimization scheme of grading ring. Finally,the optimal scheme is selected by using the theory of multivariable constrained optimization. The results show that the maximum voltage of the single insulator is reduced by about 5. 7% after optimization.
The distribution of electric field and potential along the insulator string is obvious uneven. At present,the domestic and foreign researches mainly focus on the EHV and UHV AC line. However,the HVDC large crossing transmission line is not very common,so there is a lack of systematic research on the electric field and potential distribution of large crossing and complex insulator strings. Based on the latest research results,this paper establishes three-dimensional finite element model and research the influence of grading ring parameters,considering the influence of insulator surface field strength,the insulation performance and the cost of the project construction,this paper preliminary select optimization scheme of grading ring. Finally,the optimal scheme is selected by using the theory of multivariable constrained optimization. The results show that the maximum voltage of the single insulator is reduced by about 5. 7% after optimization.
引文
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[8]胡建林,吴尧,肖代波,等.特高压直流复合支柱绝缘子均压环的优化设计[J].高电压技术,2014,40(1):46-54.HU Jianlin,WU Yao,XIAO Daibo,et al. Optimization for Grading Rings of UHV DC Composite Post Insulators[J].High Voltage Engineering,2014,40(1):46-54.
[9]李鹏,范建斌,李光范,等. 1 000 k V级特高压交流线路绝缘子串电位分布计算和均压环设计[J].中国电力,2006,39(10):33-36.LI Peng,FAN Jianbin,LI Guangfan,et al. Electric field distribution calculation and grading ring design of insulators string for 1 000 k V UHVAC lines[J]. ELECTRIC POWER,2006,39(10):33-36.
[10]邓桃,宿志一,范建斌,等.±800 k V特高压直流线路复合绝缘子均压环优化设计[J].电网技术,2010,34(8):31-35.DENG Tao,SU Zhiyi,FAN Jianbin,et al. Design Optimization of Grading Ring of Composite Insulators for±800k V UHVDC Lines[J]. Power System Technology,2010,8(34):31-35.
[11]宿志一,范建斌.复合绝缘子用于高压及特高压直流输电线路的可靠性研究[J].电网技术,2006,30(12):16-23.SU Zhiyi,FAN Jianbin. Research on reliability of composite insulators used in EHV and UHV DC transmission lines[J]. Power System Technology,2006,30(12):16-23.
[12]周志成,何俊佳,陈俊武,等.均压环改善绝缘子串电压分布研究[J].高电压技术,2006,32(11):45-48.ZHOU Zhicheng,HE Junjia,CHEN Junwu,et al. Research on improving the voltage distribution of the insulator string by voltage balance slices[J]. High Voltage Engineering,2006,32(11):45-48.
[13]徐成贤,陈志平,李乃成.近代优化方法[M].北京:科学出版社,2002.
[2]赵畹君,谢国恩,曾南超,等.高压直流输电工程技术[M].北京:中国电力出版社,2011.
[3] 800 k V直流架空输电线路设计规范GB 50790—2013[S].北京:中国计划出版社,2013.
[4]赵丹丹,郭洁,文远芳,等.基于电网络法的特高压交流悬式瓷绝缘子串均压环的研究[J].电瓷避雷器,2008(4):6-9.ZHAO Dandan,GUO Jie,WEN Yuanfang,et al. Studies on Corona Rings for UHV Lines Insulator Strings based on Electrical Network Method[J]. Insulators and Surge Arresters. 2008(4):6-9.
[5]王景朝,樊宝珍,侯继勇,等. 1 000 k V输电线路绝缘子串的均压屏蔽技术[J].高电压技术,2007,33(12):9-13.Wang Jingchao,FAN Baozhen,HOU Jiyong,et al. Grading Rings and Shielding Rings of 1 000 k V AC Transmission Line Insulator String[J]. High Voltage Engineering,2007,33(12):9-13(in Chinese).
[6]黄道春,黄正芳,王国利,等.特高压交流输电线路瓷绝缘子串电位和均压环电场分布计算模型的简化[J].高电压技术,2012,38(9):2163-2170.HUANG Daochun,HUANG Zhengfang,WANG Guoli,et al. Calculation Model Simplification for Porcelain Insulator String Potential and Grading Ring Surface Electric Field Distribution of UHV AC Transmission Line[J].High Voltage Engineering,2012,38(9):2163-2170.
[7]司马文霞,杨庆,孙才新,等.基于有限元和神经网络方法对超高压合成绝缘子均压环结构优化的研究[J].中国电机工程学报,2005,25(17):115-120.SIMA Wenxia,YANG Qing,SUN Caixin,et al. Optimization of coronaring design for EHV composite insulator using finite element and neural network method[J]. Proceedings of the CSEE,2005,25(17):115-120.
[8]胡建林,吴尧,肖代波,等.特高压直流复合支柱绝缘子均压环的优化设计[J].高电压技术,2014,40(1):46-54.HU Jianlin,WU Yao,XIAO Daibo,et al. Optimization for Grading Rings of UHV DC Composite Post Insulators[J].High Voltage Engineering,2014,40(1):46-54.
[9]李鹏,范建斌,李光范,等. 1 000 k V级特高压交流线路绝缘子串电位分布计算和均压环设计[J].中国电力,2006,39(10):33-36.LI Peng,FAN Jianbin,LI Guangfan,et al. Electric field distribution calculation and grading ring design of insulators string for 1 000 k V UHVAC lines[J]. ELECTRIC POWER,2006,39(10):33-36.
[10]邓桃,宿志一,范建斌,等.±800 k V特高压直流线路复合绝缘子均压环优化设计[J].电网技术,2010,34(8):31-35.DENG Tao,SU Zhiyi,FAN Jianbin,et al. Design Optimization of Grading Ring of Composite Insulators for±800k V UHVDC Lines[J]. Power System Technology,2010,8(34):31-35.
[11]宿志一,范建斌.复合绝缘子用于高压及特高压直流输电线路的可靠性研究[J].电网技术,2006,30(12):16-23.SU Zhiyi,FAN Jianbin. Research on reliability of composite insulators used in EHV and UHV DC transmission lines[J]. Power System Technology,2006,30(12):16-23.
[12]周志成,何俊佳,陈俊武,等.均压环改善绝缘子串电压分布研究[J].高电压技术,2006,32(11):45-48.ZHOU Zhicheng,HE Junjia,CHEN Junwu,et al. Research on improving the voltage distribution of the insulator string by voltage balance slices[J]. High Voltage Engineering,2006,32(11):45-48.
[13]徐成贤,陈志平,李乃成.近代优化方法[M].北京:科学出版社,2002.