大规模风电场高压输电线路绝缘子整体电场分布特性的研究

Research on the Entire Electric Field Distribution Characteristic of High-voltage Line Insulator for Large-scale Wind Farm

在新疆大规模风电场并网过程中,尽管已对高压输电线路采取了一定的改善电压分布的措施,但每年呈上升比例趋势发生的污闪事故已让现场运行人员不知所措。以有限元差分理论(FDTD)为基础,针对带均压环的绝缘子,利用数学推导和电磁场分析软件ANSOFT仿真分析了绝缘子的整体电场分布特性,提出了电压梯度越大的地方,能量密集度越大,在均压环端部处和绝缘子两端是局部闪络常发生处,减少电压梯度是降低绝缘子发生局部闪络关键因素。

In the parallel in process of Xinjiang Large-scale wind farm, although the measures of improve the voltage distribution has been taken, but the pollution accident which present a rising proportion trend each year made the operator at a loss. Based on the finite different time domain for the insulator with grading （FDTD） , ring, the entire electric field distribution characteristic has been analyzed by using mathematical derivation and electromagnetic field analysis software （ANSOFT） simulation, and it is proposed that where the voltage gradient is higher, the energy concentration is bigger, the end of the grading ring and both ends of insulator is the place where the flash-over occurred frequently, reducing of the voltage gradient is the key factor for reducing the partial flashover of the insulator.