基于遗传算法的特高压CVT严格无源宽频建模

Strict Passive Broadband Modeling of Ultra High Voltage CVT Based on Genetic Algorithm

针对某特高压变电站内串补平台侧隔离开关操作导致的特高压CVT故障,建立精确的特高压CVT宽频等效电路模型,有助于进行CVT暂态故障的仿真研究。本文采用基于遗传算法的建模方法对特高压CVT进行宽频建模。首先,利用矢量网络分析仪分别测量电容分压器各分压电容的宽频阻抗参数和电磁单元的散射参数;其次,利用基于遗传算法的建模方法分别建立电容分压器及电磁单元的宽频等效电路模型,且所建模型严格无源;最后,在特高压CVT一次侧施加冲击信号,在CVT的不同部位进行测量,并在EMTP中建立特高压CVT电路模型,对实验过程进行仿真,将仿真结果与实际的实验结果进行对比验证了模型的准确性和有效性。

In view of the fault of UHV CVT due to disconnector operation at the serial compensation plat- form side at certain UHV substation, the accurate UHV CVT broad band equivalent circuit model is set up, which is helpful for simulation study of the transient fault of the CVT. In this paper, the broad band model for UHV CVT is set up by the model set up method which is based on the genetic algorithm. Firstly, the vector network analyzer （VNA） is used to measure the broadband frequency-dependent impedance of the capacitor divider and the scattering parameter of the electromagnetic unit. Then, the broadband model- ing method based on genetic algorithm is used to set up the broad band equivalent circuit model of capaci- tor voltage divider and electromagnetic unit respectively and the model established is strict passive. Final- ly, the impulse signal is applied on the primary side of the UHV CVT, the measurements are performed at different positions of the CVT. The UHV CVT circuit model is set up in the EMTP so simulate the test pro- cess. The correctness and effectiveness of the model is verified by the comparison of simulation result and the actual experimental result.