南澳柔性直流输电系统涌流抑制措施及试验分析
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摘要
南澳柔性直流输电系统在充电启动过程中因投入空载变压器而产生涌流,不仅造成交流电网电压波动,而且影响风电场风能的输送。基于剩磁和偏磁互克原理的涌流抑制方法可通过控制断路器分、合闸角度达到涌流抑制的目的。对采用该原理的涌流抑制装置进行试验分析,修正断路器的分、合闸时间定值与现场断路器实际分、合闸时间一致,使断路器分、合闸角度接近目标角度90°,达到剩磁和偏磁互克的目的。试验结果验证了涌流抑制方法的有效性和可行性。
Inrush current produced in the process of charging startup of Nan'ao HVDC flexible transmission system due to input of no-load transformer will not only cause voltage fluctuation of the AC power grid,but also affect delivery of wind energy.It is able to achieve the aim of inrush current suppression by controlling opening and closing angles of the breaker based on the principle of offsetting each other between remanence and bias.Experimental analysis was conducted on the inrush current suppression device a—dopting this principle,and setting values of opening and closing time of the breaker were amended to be consistent with actual opening and closing time of the breaker on the scene so as to make opening and closing angles of the breaker close to the target angle 90°and achieve the purpose of offsetting each other between remanence and bias.Experimental results verify effectiveness and feasibility of this inrush current suppression method.
Inrush current produced in the process of charging startup of Nan'ao HVDC flexible transmission system due to input of no-load transformer will not only cause voltage fluctuation of the AC power grid,but also affect delivery of wind energy.It is able to achieve the aim of inrush current suppression by controlling opening and closing angles of the breaker based on the principle of offsetting each other between remanence and bias.Experimental analysis was conducted on the inrush current suppression device a—dopting this principle,and setting values of opening and closing time of the breaker were amended to be consistent with actual opening and closing time of the breaker on the scene so as to make opening and closing angles of the breaker close to the target angle 90°and achieve the purpose of offsetting each other between remanence and bias.Experimental results verify effectiveness and feasibility of this inrush current suppression method.
引文
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[8]BRONZEADO H,YACAMINI R.Phenomenon of Sympathetic Interaction Betw een Transformers Caused by Inrush Transients[J].IEEE Proceedings,Science,Measurement and Technology,1995,142(4):323-329.
[2]柳强,余良,易宁,等.微机励磁涌流抑制器在核电主变启动中的应用研究[J].电网与清洁能源,2014,30(6):62–69.LIU Qiang,YU Liang,YI Ning,et al.Research and Application of M icrocomputer M agnetizing Inrush Current Suppressor in Nuclear Pow er M ain-transformer No-load Closing[J].Pow er System and Clean Energy,2014,30(6):62-69.
[3]梁志豪,陈少华.变压器涌流识别技术的研究现状及趋势[J].广东电力,2013,26(7):14–17.LIANG Zhihao,CHEN Shaohua.Research Status Quo and Trend of Transformer Inrush Current Identification Technology[J].Guangdong Electric Pow er,2013,26(7):14-17.
[4]李富春,李建兵.基于EMTP/ATP的变压器建模及励磁涌流的仿真研究[J].电气开关,2009(4):48–50.LI Fuchun,LI Jianbing.The Simulation Research of Transformer M odeling and Excitation Surge Based on EM TP/ATP[J].Electric Sw itchgear,2009(4):48-50.
[5]由恒远,毕孝辉.基于偏磁和剩磁相消的变压器投切技术[J].电子技术与软件工程,2015(19):147.YOU Hengyuan,BI Xiaohui.Based on the Bias and Remanence Cancellation of Transformer Cutting Technology[J].Electronic Technology and Softw are Engineering,2015(19):147.
[6]乌云高娃,刘涤尘,叶念国.基于变压器励磁涌流成因的涌流抑制策略[J].武汉大学学报(工学版),2008,41(6):83–86.WUYUN Gaow a,LIU Dichen,YE Nianguo.Inrush Current Flow Suppression Strategy Based on the Causes of Transformer Excitation[J].Engineering Journal of Wuhan University,2008,41(6):83-86.
[7]GUZMAN A,ZOCHOLL S,BENMOUYAL G,et al.A Current-based Solution for Transformer Differential Protection,part II:Description and Evaluation[J].IEEE Transactions on Pow er Delivery,2002,17(4):886-893.
[8]BRONZEADO H,YACAMINI R.Phenomenon of Sympathetic Interaction Betw een Transformers Caused by Inrush Transients[J].IEEE Proceedings,Science,Measurement and Technology,1995,142(4):323-329.