电力系统恢复初期和应涌流影响因素分析

Analysis of the Influencing Factors on Sympathetic Inrush in Initial Period of Power Symtem Restoration

电力系统恢复初期机组调节能力有限,在空充主变的过程中存在着由于其饱和导致的和应涌流现象。针对该问题,从电网恢复初期系统模型的等值电路出发,推导出和应涌流与系统主要运行参数之间的关系表达式,分析了已恢复负荷的功率因数、负荷量和变压器的饱和特性对和应涌流产生的影响。并根据系统的实际运行状况建模进行仿真,仿真结果验证了分析的结论,为正确认识系统恢复初期和应涌流现象提供了有益的结论与参考。

In the initial period of power system restoration,because the generator unit regulating ability is limited,the sympathetic inrush current will appear as a result of the saturation when charging no-load transformer.Based on the equivalent circuit of two shunt-wound transforms in initial period of power system restoration,the mathematical representation between sympathetic inrush and main operating parameters was deduced.the influence of load power factor,load capacity and the saturation characteristic of transformers on sympathetic inrush current was analyzed.The process of sympathetic inrush was simulated based on the model with actual situation.The analytical conclusions were verified by computer results obtained and useful conclusion and reference were provided for estimating sympathetic inrush current.