| 引用本文: | 曹文斌,黄晓明,王 松,等.基于饱和深度动态相量图的变压器涌流不平衡分析[J].电力系统保护与控制,2023,51(13):139-147. |
| CAO Wenbin,HUANG Xiaoming,WANG Song,et al.Imbalance analysis of transformer inrush current based on saturation degree dynamic phasor diagram[J].Power System Protection and Control,2023,51(13):139-147 |
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| 摘要: |
| 为阐释高阻抗变压器三相涌流严重不平衡的产生机理，定义了可反映三相涌流不平衡特性的铁心“饱和深度”概念，并结合相量理论提出了基于饱和深度动态相量图的涌流不平衡特性分析方法。基于该方法可直观掌握变压器运行时各相铁心饱和深度随分合闸角度及时间的变化规律，从而快速辨识涌流极限不平衡的边界角度。不同分合闸角度时的数值模拟结果表明不平衡度和零序电流大小趋势基本一致，仿真和录波验证了出现涌流极限不平衡和零序电流峰值的边界角度的一致性。基于高阻抗变压器参数特征及边界角度，阐释了高阻抗变压器因原边零模涌流变大和副边环流变小两方面原因导致三相涌流严重不平衡的现象。 |
| 关键词: 高阻抗变压器 不平衡 饱和深度 动态相量图 零序电流 |
| DOI：10.19783/j.cnki.pspc.202203 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(51877090) |
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| Imbalance analysis of transformer inrush current based on saturation degree dynamic phasor diagram |
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CAO Wenbin1, 2, HUANG Xiaoming2, WANG Song2, QIU Yutao3, WEN Minghao1, YIN Xianggen1
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1. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and
Technology, Wuhan 430074, China; 2. State Grid Zhejiang Electric Power Co., Ltd. Research Institute, Hangzhou 310014, China;
3. State Grid Zhejiang Electric Power Co., Ltd., Hangzhou 310007, China
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| Abstract: |
| To explain the generation mechanism of the severe imbalance of three-phase inrush current of high-impedance transformers, the concept of core “saturation degree” is defined. This can reflect the imbalance of three-phase inrush current. With the help of phasor theory, the analytical method for imbalance of three-phase inrush current is proposed based on a saturation degree dynamic phasor diagram. Based on this method, the variation law of the saturation degree of each phase iron core with the opening and closing angle and time can be intuitively obtained, and the boundary angle of the extreme imbalance can be quickly identified. The numerical simulation results at different opening and closing angles show that the trend of imbalance degree and zero-sequence current magnitude is basically the same. The simulation and wave record validate the consistency of the boundary angle of extreme imbalance and peak value of zero-sequence current. Based on the parameter characteristics and boundary angle of a high-impedance transformer, the phenomenon of serious imbalance of three-phase inrush current in high-impedance transformer is explained by the increase of zero-mode inrush current on the primary side and the decrease of circulating current of secondary side. |
| Key words: high-impedance transformers unbalance saturation degree dynamic phasor diagram zero-sequence current |
