DC Instability and Suppression Strategy of Transformer Based on Exciting-Current Identification
Pan Chao1, Jin Mingquan1, Cai Guowei1, Chen Tie2
1. School of Electrical Engineering Northeast Electric Power University Jilin 132012 China; 2. Harbin Power Supply Company of State Grid Heilongjiang Electric Power Supply Company Harbin 150000 China
Abstract：In order to further improve the anti-DC disturbance performance of power transformer, the discriminant and suppression strategy is studied aiming at the problem of biasing instability. The DC disturbance state equation is constructed though basic electromagnetic mechanism. The excitation current identification method is studied by using the port electrical information, and the biasing instability criterion is proposed. The electromagnetic characteristics are simulated based on the electromagnetic coupling model in AC/DC hybrid operation. The abnormality of the (quasi) DC disturbance is characterized by excitation current, and its variation rule is summarized. Anomaly discriminating method of DC-bias transformer is analyzed through the applicability of different biasing instability criteria. The DC disturbance experiment platform of 220V three-phase group transformer is used to verify the method’s correctness. The DC disturbance excitation characteristic of 10kV transformer is analyzed and the effectiveness of the method is further explained. Finally, a new DC disturbance suppression strategy is proposed by the DC disturbance abnormal discriminant method. The effectiveness of the suppression strategy is verified by simulation and experimental.
潘超, 金明权, 蔡国伟, 陈铁. 基于变压器励磁电流辨识的直流失稳与抑制策略[J]. 电工技术学报, 2018, 33(18): 4267-4276.
Pan Chao, Jin Mingquan, Cai Guowei, Chen Tie. DC Instability and Suppression Strategy of Transformer Based on Exciting-Current Identification. Transactions of China Electrotechnical Society, 2018, 33(18): 4267-4276.
[1] Bai Baodong, Chen Zhiwei, Chen Dezhi.DC bias elimination and integrated magnetic technology in power transformer[J]. IEEE Transactions on Magnetics, 2015, 51(11): 1-4. [2] 索南加乐, 张健康, 张军民, 等. 交直流混联系统对变压器保护性能的影响及解决措施[J]. 电力系统自动化, 2010, 34(3): 101-106. Suonan Jiale, Zhang Kangjian, Zhang Junmin, et al.The adverse impacts on transformer protection performance by hybrid AC-DC transmission grid system and counter-measures[J]. Automation of Electric Power Systems, 2010, 34(3): 101-106. [3] 刘春明, 王璇, 刘连光, 等. 考虑海岸效应影响的电网地磁感应电流的计算方法[J]. 中国电机工程学报, 2016, 36(22): 6059-6066. Liu Chunming, Wang Xuan, Liu Lianguang, et al.Calculation method of geomagnetically induced currents in the power grid considering the influence of the coast effect[J]. Proceedings of the CSEE, 2016, 36(22): 6059-6066. [4] 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 suppression method of transformer DC bias[J]. Transactions of China Electrotechnical Society, 2015, 30(14): 208-214. [5] 陈国栋, 宋晋峰, 张亮, 等. 动态电压恢复器注入变压器的直流偏磁抑制策略[J]. 中国电机工程学报, 2014, 34(28): 138-143. Chen Guodong, Song Jinfeng, Zhang Liang, et al.Control strategy for eliminating DC magnetic flux in the injection transformer of a dynamic voltage restorer[J]. Proceedings of the CSEE, 2014, 34(28): 138-143. [6] Tanaka S, Murata H, Oishi T, et al.Imaging of magnetic nanoparticles using a second harmonic of magnetization with DC bias field[J]. IEEE Transa- ctions on Magnetics, 2015, 51(2): 1-4. [7] 潘超, 王泽忠, 李海龙, 等. 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, et al.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. [8] 刘春明, 黄彩臣, 林晨翔. 抑制变压器地磁感应电流的电容隔直装置安装位置优化[J]. 电力系统自动化, 2016, 40(16): 132-137. Liu Chunming, Huang Caichen, Lin Chenxiang.Installation position optimization of capacitor DC blocking devices for suppressing geomagnetically induced currents in transformers[J]. Automation of Electric Power Systems, 2016, 40(16): 132-137. [9] 索南加乐, 许立强, 焦在滨, 等. 基于磁路特征的三相三柱式变压器励磁参数识别[J]. 中国电机工程学报, 2011, 31(19): 97-104. Suonan Jiale, Xu Liqiang, Jiao Zaibin, et al.Identification method for excitation inductances of three-phase three-limb transformer based on characteristics of magnetic circuit[J]. Proceedings of the CSEE, 2011, 31(19): 97-104. [10] 邓祥力, 高亮, 刘建峰, 等. 特高压变压器模型漏感参数的稳态识别方法[J]. 电工技术学报, 2014, 29(5): 254-260. Deng Xiangli, Gao Liang, Liu Jianfeng, et al.Steady- State parameter identification of UHV transformer model[J]. Transactions of China Electrotechnical Society, 2014, 29(5): 254-260. [11] 焦在滨, 马涛, 屈亚军, 等. 基于励磁电感参数识别的快速变压器保护[J]. 中国电机工程学报, 2014, 34(10): 1658-1666. Jiao Zaibin, Ma Tao, Qu Yajun, et al.A novel excitation inductance-based power transformer protection scheme[J]. Proceedings of the CSEE, 2014, 34(10): 1658-1666. [12] 郑涛, 陈佩璐, 刘连光, 等. 计及直流偏磁的电流互感器传变特性对差动保护的影响[J]. 电力系统自动化, 2012, 36(20): 89-93. Zheng Tao, Chen Peilu, Liu Lianguang, et al.Transferring charateristics of current transformer affected by DC magnetic bias and its impact differential protection[J]. Automation of Electric Power Systems, 2012, 36(20): 89-93. [13] 潘超, 王梦纯, 杨德友, 等. 变压器三维电磁场有限元计算问题的研究[J]. 东北电力大学学报, 2014, 34(2): 21-26. Pan Chao, Wang Mengchun, Yang Deyou, et al.Computing problem research based on finite element method for 3D electromagnetic analysis of trans- former[J]. Journal of Northeast Dianli University, 2014, 34(2): 21-26. [14] 全江涛, 童歆, 文习山, 等. 复杂运行工况下变压器直流偏磁的抑制[J]. 高电压技术, 2015, 41(7): 2464-2472. Quan Jiangtao, Tong Xin, Wen Xishan, et al.mitigation of transformer DC bias in complicated operation conditions[J]. High Voltage Engineering, 2015, 41(7): 2464-2472. [15] 索南加乐, 焦在滨, 宋国兵, 等. 一种适用于Y/△接线变压器的励磁电感计算方法[J]. 电力系统自动化, 2007, 31(9): 32-36, 67. Suonan Jiale, Jiao Zaibin, Song Guobing.An algorithm to calculate the excitation inductance of power transformer with Y-Delta connection[J]. Automation of Electric Power Systems, 2007, 31(9): 32-36, 67. [16] 李泓志, 崔翔, 刘东升, 等. 直流偏磁对三相电力变压器的影响[J]. 电工技术学报, 2010, 25(5): 88-96. Li Hongzhi, Cui Xiang, Liu Dongsheng, et al.Influence on three-phase power transformer by DC bias excitation[J]. Transactions of China Electro- technical Society, 2010, 25(5): 88-96. [17] 白保东, 赵晓旋, 陈德志, 等. 基于J-A模型对直流偏磁条件下变压器励磁电流的模拟及实验研究[J]. 电工技术学报, 2013, 28(增刊2): 162-166. Bai Baodong, Zhao Xiaoxuan, Chen Dezhi, et al.Simulation and experiment research on transformer excitation current under DC magnetic bias based on J-A model[J]. Transactions of China Electrotechnical Society, 2013, 28(S2): 162-166. [18] 郭满生, 梅桂华, 刘东升, 等. 直流偏磁条件下电力变压器铁心B-H曲线及非对称励磁电流[J]. 电工技术学报, 2009, 24(5): 46-51, 59. Buo Mansheng, Mei Guihua, Liu Dongsheng, et al.B-H curve based on core and asymmetric magnetizing current in DC-biased transformers[J]. Transactions of China Electrotechnical Society, 2009, 24(5): 46-51, 59. [19] 李晓萍, 文习山. 三相五柱变压器直流偏磁计算研究[J]. 中国电机工程学报, 2010, 30(1): 127-131. Li Xiaoping, Wen Xishan.DC bias computation study on three-phase five limbs transformer[J]. Proceedings of the CSEE, 2010, 25(5): 88-96. [20] 张金平, 张辉, 熊敏, 等. 基于串联电容法的变压器中性点直流电流抑制装置[J]. 电网技术, 2009, 33(20): 147-151. Zhang Jinping, Zhang Hui, Xiong Min, et al.Application of a series capacitor based transformer neutral DC current blocking device[J]. Power System Technology, 2009, 33(20): 147-151. [21] 赵志刚, 刘福贵, 张俊杰, 等. 直流偏磁条件下变压器励磁电流的实验与分析[J]. 电工技术学报, 2010, 25(4): 71-76. Zhao Zhigang, Liu Fugui, Zhang Junjie, et al.Measurement and analysis of magnetizing current in DC-biased transformers[J]. Transactions of China Electrotechnical Society, 2010, 25(4): 71-76.
2018, Vol. 33 
