基于可变合闸角的变压器励磁涌流抑制方法

变压器空载合闸励磁涌流可能引发电网安全问题，采用固定峰值选相合闸抑制励磁涌流的技术尚有提升空间。提出一种基于可变合闸角的励磁涌流抑制方法及控制策略，采用主变压器高压侧或低压侧的电压互感器测算剩磁，并根据剩磁情况调整目标合闸角，阐明了影响剩磁的关键因素及目标合闸角优选原则。试制了装置样机并通过动模仿真及开关带电试验验证了该方法的有效性，为工程实用化提供参考。

Research on Inrush Current Suppression of Transformer Based on Changeable Closing Angle

The transformer no-load closing inrush current may cause safety problems in power grid, and the controlled switching technology with fixed target angle still has room for improvement in suppressing inrush current. A transformer inrush current suppression method and controlled-switching strategy are thus proposed based on changeable closing angle. The high voltage side PT or low voltage side PT of transformer is used to calculate the residual flux, and the target closing angle is adjusted according to residual flux. The key factors influencing the residual flux are determined, and the principles for choosing the target closing angle are proposed. A device prototype is developed and its effectiveness is verified through dynamic simulation and test station, which can provide reference for its engineering application.