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| 交直流混联系统对变压器保护性能的影响及解决措施 | |
| 引用本文： | 索南加乐,张健康,张军民,粟小华,孙成,杜斌. 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 |
| 作者姓名： | 索南加乐 张健康 张军民 粟小华 孙成 杜斌 |
| 作者单位： | 1. 西安交通大学电气工程学院,陕西省西安市,710049 2. 西安交通大学电气工程学院,陕西省西安市,710049;西北电力调度通信中心,陕西省西安市,710048 3. 西北电力调度通信中心,陕西省西安市,710048 |
| 摘 要： | 在交直流混联系统中,直流偏磁和换相失败都会对变压器差动保护产生不利影响.以西北电网交直流混联系统为分析对象,分别研究了变压器差动保护在这2种情况下的运行性能.仿真数据表明:直流偏磁严重的变压器发生区内弱故障时,差动电流中的2次谐波将会引起变压器差动保护拒动;直流系统换相失败时,交流系统电流可以看成一个谐波源,此时发生内部故障时,变压器差动保护也会由于差动电流中2次谐波的存在而使保护拒动.为了解决这些问题,文中采用了基于故障分量综合阻抗的保护方案.理论分析和仿真验证都表明新方案在变压器直流偏磁或换相失败时仍然具有很高的灵敏度和可靠性. |
| 关 键 词： | 直流偏磁 换相失败 交直流混联系统 2次谐波 故障分量综合阻抗 |
| 收稿时间： | 2009-07-22 |
| 修稿时间： | 2010-01-19 |
The Adverse Impacts on Transformer Protection Performance by Hybrid AC-DC Transmission Grid System and Counter-measures |
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| SUONAN Jiale,ZHANG Jiankang,ZHANG Junmin,SU Xiaohu,SUN Cheng,DU Bin. 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 | |
| Authors: | SUONAN Jiale ZHANG Jiankang ZHANG Junmin SU Xiaohu SUN Cheng DU Bin |
| Affiliation: | 1. Xi'an Jiaotong University;Xi'an 710049;China;2. Northwest Electric Power Dispatching and Communication Center;Xi'an 710048;China |
| Abstract: | In a hybrid AC-DC transmission grid,DC bias and commutation failure have adverse effects on the behavior of transformer differential protection. With the model of an actual hybrid AC-DC transmission grid in northwest of China,the performance of differential protection under these two situations are discussed. Simulation results show that the second order harmonic produced by DC bias may cause miss-operation of differential protection in the event of minor internal faults. The results also reveal that under ... |
| Keywords: | DC bias commutation failure hybrid AC-DC transmission grid the 2nd order harmonic excitation impedance |
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