新型HVDC换流变压器绕组振动抑制研究
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摘要
针对高压直流输电(HVDC)换流变压器的阀侧换流器产生大量谐波电流,导致过量谐波电流流过换流变压器绕组,使铁心由于谐波磁通过大而过饱和,引发换流变压器的铁心和绕组剧烈振动问题,对新型换流变压器绕组在谐波条件下的电磁振动进行理论研究。首先,基于三绕组变压器理论并考虑特征次谐波,求解新型换流变压器各绕组电流与负载电流的变换关系;然后,利用虚位移法求解绕组受到的电磁力,建立绕组及相应铁心的3-D有限元(FEM)模型,通过瞬态求解最终得到其电磁振动特性。最后,测试变压器的绕组振动,通过对比实测振动和有限元计算结果验证计算的可靠性。研究结果显示,感应滤波技术对绕组电磁振动的抑制效果显著。
Nonlinear loads in valve side of high-voltage direct current(HVDC) converter transformer produces a mass of harmonic currents, and DC magnetic bias phenomena also affects the converter transformer. As a result, harmonic currents in the windings and harmonic flux in the core of converter transformer increases, which leads to more serious vibration of windings and core. It has become a new problem in HVDC project. Winding electromagnetic vibration of a new converter transformer considering harmonic currents was studied. Transformation matrices from load currents to windings′ currents were proposed and the electromagnetic forces of windings were calculated by Lagrange′s theorem. The 3-D finite element method(FEM) model of windings and core was established. Finally, the windings′ vibration characteristics were determined by computing the FEM model with transient dynamic analysis method. Finally, the windings′ vibration was tested, and the experimental data verified the correctness of the FEM simulation. The result reveals that the new HVDC converter transformer can suppress the windings′ vibration.
Nonlinear loads in valve side of high-voltage direct current(HVDC) converter transformer produces a mass of harmonic currents, and DC magnetic bias phenomena also affects the converter transformer. As a result, harmonic currents in the windings and harmonic flux in the core of converter transformer increases, which leads to more serious vibration of windings and core. It has become a new problem in HVDC project. Winding electromagnetic vibration of a new converter transformer considering harmonic currents was studied. Transformation matrices from load currents to windings′ currents were proposed and the electromagnetic forces of windings were calculated by Lagrange′s theorem. The 3-D finite element method(FEM) model of windings and core was established. Finally, the windings′ vibration characteristics were determined by computing the FEM model with transient dynamic analysis method. Finally, the windings′ vibration was tested, and the experimental data verified the correctness of the FEM simulation. The result reveals that the new HVDC converter transformer can suppress the windings′ vibration.
引文
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[2] ANDERSON B R.HVDC transmission-opportunities and challenges[C]//The 8th IEE international conference on AC and DC Power Transmission,March 28-31,2006,London,UK.2006:24-29.
[3] 阮学云,李志远,魏浩征.换流变压器户外相干噪声预测模型研究[J].高电压技术,2015,41(5):1664.RUAN Xueyun,LI Zhiyuan,WEI Haozheng.Coherent noise prediction model research of converter transformer[J].High Voltage Engineering,2015,41(5):1664.
[4] 李铁楠,胡胜,陈绍艺,等.新建变电站和换流站噪声控制技术[J].湖南电力,2014,34(6):41.LI Tienan,HU Sheng,CHEN Shaoyi,et al.Noise controlling technology in new substations and converter stations [J].Hunan Electric Power,2014,34(6):41.
[5] 汪金刚,毛凯,段旭,等.直流偏磁下的变压器振动仿真与试验[J].电机与控制学报,2015,19(1):58.WANG Jingang,MAO Kai,DUAN Xu,et al.Simulation and test of transformer vibration under DC bias[J].Electric Machines and Control,2015,19(1):58.
[6] 祝丽花,杨庆新,闫荣格,等.考虑磁致伸缩效应电力变压器振动噪声的研究[J].电工技术学报,2013,28(4):1.ZHU Lihua,YANG Qingxin,YAN Rongge,et al.Research on vibration and noise of power transformer cores including magnetostriction effects[J].Transactions of China Electrotechnical Society,2013,28(4):1.
[7] IEEE Committee Report.Bibliography on Transformer Noise[R].IEEE Transactions on Power Apparatus and systems,1960.
[8] 董志刚.变压器的噪声[J].变压器,1995,32(11):27.DONG Zhigang.Transformer Noise[J].Transformer,1995,32(11):27.
[9] 邵鹏飞.感应滤波换流变压器的绕组振动研究[D].长沙:湖南大学,2012.
[10] LI Yong,LUO Longfu,REHTANZ C,et al.Study on characteristic Parameters of a new converter transformer for HVDC systems[J].IEEE Transactions on Power Delivery,2009,24(4):2125.
[11] 邵鹏飞,罗隆福,宁志毫,等.感应滤波技术应用于工业定制电力系统的运行经验分析[J].电力自动化设备,2011,33(4):59.SHAO Pengfei,LUO Longfu,NING Zhihao,et al.Analysis of application experience of inductive filtering technology in industrial power system[J].Electric Power Automation Equipment,2011,33(4):59.
[12] 王兆安,杨君,刘进军.谐波抑制与无功补偿[M].北京:机械工业出版社,2006.
[13] 瓦修京斯基.变压器的理论与计算[M].崔丽君,杜恩田,译.北京:机械工业出版社,1983.
[14] 李洪奎,李岩.不同预紧力下变压器绕组轴向振动模态分析[J].电机与控制学报,2010,14(8):98.LI Hongkui,LI Yan.Axial vibration modal analysis of transformer windings under different levels of pre-compression[J].Electric Machines and Control,2010,14(8):98.
[15] 罗隆福,赵圣全,邵鹏飞,等.感应滤波变压器的振动模态研究[J].电工电能新技术,2014,33(5):27.LUO Longfu,ZHAO Shengquan,SHAO Pengfei,et al.Study of vibration modal of inductive filtering transformer[J].Advanced Technology of Electrical Engineering and Energy,2014,33(5):27.