计及剩磁、合闸电阻及选相合闸策略的励磁涌流仿真评估方法

Evaluation Method for Inrush Current Simulation Considering Ｒesidual Flux，Closing Ｒesistance and Phase － controlled Switching Strategy

摘要:

长链式薄弱电网中，变压器空载励磁涌流是制约电力系统和用户设备安全稳定运行的重要因素。首先针对 剩磁评估、合闸电阻及选相合闸技术相结合的励磁涌流综合抑制措施进行介绍，并详细分析 3 种措施相互配合对励磁 涌流的影响。最后，基于 PSCAD 仿真平台，搭建藏中联网工程电磁暂态模型并提出剩磁准确添加方法。空充主变压 器励磁涌流试验结果与仿真结果高度吻合，充分验证了所提励磁涌流仿真评估方法的有效性。

Abstract:

The inrush current of transformer has a major influence on the stability and safety of power grid and load equipment． The evaluation of residual flux，together with the application of closing resistance and phase － controlled switching strategy， has formed a comprehensive suppression measure with inrush current，which is explained in detail． Also，how the coordination among the three methods mentioned above can impact on inrush current is given． Finally，based on PSCAD，the transient simulation model of Mid － Tibet interconnection project is established with a careful consideration of residual flux to evaluate the inrush current． Considering the amplitude and change trend of inrush current，the experiment result is a high coincidence with that of the simulation result． And the effectiveness of the proposed evaluation method is verified．