Accuracy Analysis for DC-Biased UHV Transformer in No-Load
Tan Ruijuan1, Wang Zezhong1, Deng Tao1, Xu Jianwen2, Li Shulian2
1. Key Laboratory of High Voltage & EMC North China Electric Power University Beijing 102206 China; 2. Shandong Power Equipment Co. Ltd Jinan 250000 China
Abstract：Due to the problem about DC-biased computation on UHV transformer, a new segmented analytical method for simplified circuit model of no load has been proposed. It lays the foundation for the numerical calculation. According to the simplified circuit model of no load, analytical formula is derived. With the change of the current, inductance is in two stages. The inductance value is determined by comparing the calculated current value with the critical current value. A critical current error criterion is set to determine whether the calculated current value reaches the critical current. The calculated result shows that the accurate solution of dc component can be obtained under a low resistance and a small error criterion. Instead, with a larger error criterion, the values of dc component vary greatly with accurate solutions, even exist wrong solutions. Finally, based on the above analytical solutions, the numerical solutions of the fourth Runge-Kutta are analyzed. The results show that it is necessary to increase the resistance when the time step is large, corresponding to a large error criterion; while the resistance may not be too much with a smaller time step, corresponding to a smaller error criterion. An accurate numerical solution can be obtained with an appropriate time step and an artificially increased resistance in the calculation of UHV DC bias transformer.
谭瑞娟, 王泽忠, 邓涛, 胥建文, 李书连. 特高压变压器空载直流偏磁计算精度分析[J]. 电工技术学报, 2017, 32(4): 162-169.
Tan Ruijuan, Wang Zezhong, Deng Tao, Xu Jianwen, Li Shulian. Accuracy Analysis for DC-Biased UHV Transformer in No-Load. Transactions of China Electrotechnical Society, 2017, 32(4): 162-169.
[1] 张文亮, 吴维宁, 胡毅. 特高压输电技术的研究与我国电网的发展[J]. 高电压技术, 2003, 29(9): 16-18. Zhang Wenliang, Wu Weining, Hu Yi. Research on UHV transmission technology and development of power network in China[J]. High Voltage Engin- eering, 2003, 29(9): 16-18. [2] Ahfock A, Hewit A J. DC magnetization of trans- former[J]. IEEE Proceedings of Electric Power Applications, 2006, 153(4): 601-607. [3] Pan Zhuohong, Wang Xiaomao, Tan Bo, et al. Potential compensation method for restraining the DC bias of transformers during HVDC monopolar operation[J]. IEEE Transactions on Power Delivery, 2016, 31(1): 103-111. [4] Zheng K, Boteler D, Prijola R, et al. Effects of system characteristics on geomagnetically induced currents[J]. IEEE Transactions on Power Delivery, 2014, 29(2): 890-898. [5] 刘连光, 刘春明, 张冰. 磁暴对我国特高压电网的影响[J]. 地球物理学报, 2008, 51(4): 976-981. Liu Lianguang, Liu Chunming, Zhang Bing. Effects of geomagnetic storm on UHV power grids in China[J]. Chinese Journal of Geophysics, 2008, 51(4): 976-981. [6] 郑涛, 卢婷, 杨国生, 等. GIC引发直流偏磁对距离保护Ⅲ段动作性能影响的分析[J]. 电力系统保护与控制, 2015, 43(2): 1-5. Zheng Tao, Lu Ting, Yang Guosheng, et al. Analysis of the effects on distance protection zone Ⅲ relays caused by DC bias induced from geomagnetic induced current[J]. Power System Protection and Control, 2015, 43(2): 1-5. [7] 杨晓辉, 王丰华, 段若晨. 500kV电力变压器直流偏磁耐受性能的仿真研究[J]. 电力系统保护与控制, 2014, 42(14): 60-66. Yang Xiaohui, Wang Fenghua, Duan Ruochen. Simulation study of DC bias enduring ability of 500kV power transformer[J]. Power System Pro- tection and Control, 2014, 42(14): 60-66. [8] 陈志伟, 白保东, 陈德志, 等. 电力变压器直流偏磁现象形成机理及一种抑制措施的研究[J]. 电工技术学报, 2015, 30(14): 208-214. Chen Zhiwei, Bai Baodong, Chen Dezhi, et al. Research on the formation mechanism and supper- ssion method of transformer DC bias[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 208-214. [9] 李振强, 谷定燮, 戴敏. 特高压空载变压器谐振过电压和励磁涌流分析及抑制方法[J]. 高电压技术, 2012, 38(2): 387-392. Li Zhenqiang, Gu Dingxie, Dai Min. Analysis and suppression method of no-load ultra-high voltage transformer resonance overvoltage and inrush current[J]. High Voltage Engineering, 2012, 38(2): 387-392. [10] 邓祥力, 王传启, 张哲. 基于回路平衡方程和励磁电感的特高压变压器保护[J]. 中国电机工程学报, 2012, 32(1): 147-153. Deng Xiangli, Wang Chuanqi, Zhang Zhe. UHV transformer protection based on equivalent circuit equation and excitation inductance[J]. Proceedings of the CSEE, 2012, 32(1): 147-153. [11] Zheng T, Chen P L, Qi Z, et al. A novel algorithm to avoid the maloperation of UHV voltage-regulating transformers[J]. IEEE Transactions on Power Delivery, 2014, 29(5): 2146-2153. [12] 曾麟钧, 林湘宁, 黄景光, 等. 特高压自耦变压器的建模和电磁暂态仿真[J]. 中国电机工程学报, 2010, 30(1): 91-97. Zeng Linjun, Lin Xiangning, Huang Jingguang, et al. Modeling and electromagnetic transient simulation of UHV autotransformer[J]. Proceedings of the CSEE, 2010, 30(1): 91-97. [13] 岳昊, 徐永梅, 刘颖英, 等. 特高压交流系统三绕组自耦变压器非线性模型的研究[J]. 电工电能新技术, 2010, 29(3): 44-53. Yue Hao, Xu Yongmei, Liu Yingying, et al. Research on nonlinear model of UHV AC system three- winding autotransformer[J]. Advanced Technology of Electrical Engineering and Energy, 2010, 29(3): 44-53. [14] 张婕. 特高压涌流识别及直流偏磁对其影响研究[D]. 北京: 华北电力大学, 2012. [15] 郭健, 林鹤云, 徐子宏, 等. 单螺旋绕组变压器支路电流的场路耦合计算及分析[J]. 电工技术学报, 2010, 25(4): 65-70. Guo Jian, Lin Heyun, Xu Zihong, et al. Calculation and analysis of branch currents of single spiral winding transformer based on field circuit coupled method[J]. Transaction of China Electrotechnical Society, 2010, 25(4): 65-70. [16] 王泽忠, 潘超, 刘连光, 等. 基于棱边有限元法的变压器瞬态场路耦合模型[J]. 电工技术学报, 2012, 27(9): 146-152. Wang Zezhong, Pan Chao, Liu Lianguang, et al. Transient magnetic circuit coupled model of trans- former based on edge finite element method[J]. Transactions of China Electrotechnical Society, 2012, 27(9): 146-152. [17] 潘超, 王泽忠, 李海龙. 基于瞬态场路耦合模型的变压器直流偏磁计算[J]. 电工技术学报, 2013, 28(5): 174-181. Pan Chao, Wang Zezhong, Li Hailong. DC-bias calculation for single phase transformers based on transient field-circuit coupled model[J]. Transactions of China Electrotechnical Society, 2013, 28(5): 174-181. [18] 潘超, 王泽忠, 杨敬瑀, 等. 变压器直流偏磁瞬态场路耦合计算的稳定性分[J]. 电工技术学报, 2012, 27(12): 226-239. Pan Chao, Wang Zezhong, Yang Jingyu, et al. Stability analysis based on transient magnetic-circuit coupled method for DC-biased transformer[J]. Transactions of China Electrotechnical Society, 2012, 27(12): 226-239.
2017, Vol. 32 
