特高壓高補償度串補線路的潛供電流問題
[Abstract]:Adding series compensation to UHV lines can improve the transmission capacity of transmission channels, and at the same time, the low frequency oscillation of the potential power supply current in the single phase fault of the line is also caused, which makes it difficult to extinguish the submersible arc, which is disadvantageous to the single-phase reclosing of circuit breakers. Long distance UHV lines need to be equipped with series compensation with higher compensation degree, which makes the influence of series compensation on the line potential supply current and recovery voltage more worthy of attention. At present, the measures of line protection and by-pass are generally adopted to suppress the potential supply current of series compensation lines, but the effect of series compensation with high compensation degree needs to be analyzed. In addition, the high amplitude low frequency oscillating current flow through the line may lead to saturation, which makes the characteristics of the potential supply current and recovery voltage different from that of the high reactance as a linear element. The influence mechanism of series compensation on the potential supply current and recovery voltage of UHV lines is analyzed. Based on the typical system conditions, the effects of series compensation and high saturation resistance on the potential supply current and recovery voltage are simulated. The influence of the time difference of linkage bypass on the inhibition effect was analyzed. The results can be used as a reference for the engineering design and equipment selection of UHV long distance and high compensation series compensation lines.
【作者單位】: 新能源電力系統(tǒng)國家重點實驗室(華北電力大學);中國電力科學研究院;
【基金】:國家電網公司科技項目(SGNX0000DKJS1500066)~~
【分類號】:TM75
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