变压器励磁涌流分析与抑制策略研究analysisof-bowenpublishing.pdf

Oct. 2013, Volume 3, Issue 5, PP. 92-99 Scientific Journal of Electrical Engineering 变压器励磁涌流分析与抑制策略研究 王鹏，尹桂春，刘志珍 山东大学 电气工程学院，济南 250061 摘要：为了减少变压器空投或切除外部故障恢复电压时产生的励磁电流，降低其对电网的影响，本文分析了几种抑制励磁涌 流的方法，并搭建控制平台验证了直流偏磁和剩磁相抵消算法的可行性。首先，阐述励磁涌流产生的原理，分析抑制励磁涌 流的措施；其次，基于DSP2812 搭建二次谐波制动算法配合直流偏磁和剩磁相抵消算法的控制平台；最后，对该控制平台进 行现场试验验证。结果显示变压器励磁涌流基本被抑制到了额定电流以内，该控制平台能有效抑制变压器励磁电流。 关键字：励磁涌流；铁磁特性；剩磁；直流偏磁；动模实验 Analysis of Transformer Magnetizing Inrush Current and Restraint Strategy * Peng Wang , Guichun Yin, Zhizhen Liu School of Electrical Engineering, Shandong University, Jinan 250061, China wangpeng072@ Abstract: To reduce the magnetizing inrush current of transformer, when it has no load or it recovers the voltage after external failure and to weaken the impact on the power system, several methods to eliminate inrush current are proposed in this paper. Firstly the prin- ciple of the generation of magnetizing inrush current is discussed, and then the measure is analyzed; secondly, with the help of PCB, the control platform which combines second harmonic restraint algorithm with DC Bias and remanence offset algorithm is finished. Finally we have performed the dynamic simulation experiments and field trial running. The result shows that the inrush current of transformer basically has been suppressed to less than the rated current, even far less than it. The method can effectively inhibit the transformer inrush current. Keywords: Magnetizing Inrush Current; Ferromagnetic Characteristic; Remanence; DC Bias; Dynamic Simulation Experiments 引言 变压器是根据电磁感应原理工作的静止的交流输电系统中重要的电能设备。变压器空载投入电网时由于变压器 铁心磁通的饱和以及铁心材料的非线性，会产生很大的励磁涌流，可能会对电网的安全稳定运行造成不良影响[1-2]， 如果不能正确识别或者抑制，涌