柔性直流输电启动充电过电流分析及改进研究

Analysis and Improvement of Overcurrent in Starting Charging of Flexible DC Transmission

文章基于工程案例,详细介绍了换流变剩磁偏大和磁饱和造成限流电阻过流的原理,并在电磁暂态虚拟程序PSCAD/EMTDC内建立了细致的VSC-HVDC仿真模型,对于仿真系统中变压设备模型无法模拟初始剩磁的情况,提出了有效的方法。

Based on an engineering case,this article introduces in detail the principle of the overcurrent of the current-limiting resistor caused by the large residual magnetism and magnetic saturation of the converter transformer equipment.Then a detailed VSCHVDC simulation model was established in the electromagnetic transient virtual program PSCAD/EMTDC,and an effective method was proposed for the situation that the transformer equipment model in the simulation system cannot simulate the initial remanence.