【摘要】：雷電沖擊試驗中的直流電纜為大電容試品,試驗回路中電感對沖擊波形的影響不可忽略,沖擊電壓發(fā)生器電阻參數(shù)設(shè)置不當將會導(dǎo)致波形過沖和振蕩,為此提出一種基于優(yōu)化模型的雷電沖擊電壓試驗波形參數(shù)控制方法。首先,對試驗回路進行理論推導(dǎo),并分析波前時間和過沖率之間的關(guān)系,在此基礎(chǔ)上引入一個可用于表征波形過沖率的變量Δ_m;其次,以波前時間最小為目標函數(shù),通過限制Δ_m的數(shù)值對波形過沖率進行約束,建立電阻參數(shù)優(yōu)化模型;最后,設(shè)置不同的Δ_m對模型進行求解,并通過仿真計算和實際試驗驗證其有效性。結(jié)果表明,隨著Δ_m設(shè)置值的增加,過沖率呈上升趨勢,波前時間呈下降趨勢,優(yōu)化模型能夠?qū)Σㄐ螀?shù)進行有效控制。為確定Δ_m的合理設(shè)置范圍,研究了不同試品電容、不同回路電感下Δ_m設(shè)置值對過沖率、波前時間的影響。結(jié)果表明,Δ_m取值為0.9~1時,能夠保證波形過沖率不超過標準規(guī)定的10%。
[Abstract]:The DC cable in the lightning shock test is a large capacitance test. The influence of inductance on the shock wave shape can not be ignored in the test loop. The improper setting of the resistance parameters of the impulse voltage generator will lead to the waveform overshoot and oscillation. In this paper, an optimal model based waveform parameter control method for lightning impulse voltage test is proposed. First, the experimental circuit is theoretically deduced, and the relationship between wavefront time and overshoot ratio is analyzed. On this basis, a variable 螖 _ m which can be used to characterize the waveform overshoot rate is introduced. Secondly, the minimum wavefront time is taken as the objective function. Through limiting the value of 螖 _ m, the waveform overshoot rate is constrained, and the resistance parameter optimization model is established. Finally, different 螖 _ m is set up to solve the model, and the validity of the model is verified by simulation and practical experiments. The results show that with the increase of 螖 _ m, the overshoot rate increases and the wavefront time decreases. The optimized model can effectively control the waveform parameters. In order to determine the reasonable setting range of 螖 _ m, the effects of the values of 螖 _ m on overshoot rate and wave front time under different capacitance and different loop inductance were studied. The results show that when 螖 _ m is taken from 0.9 ~ 1, the waveform overshoot rate can be guaranteed to not exceed the 10 ~ (th) specified in the standard.
【作者單位】： 國網(wǎng)浙江省電力公司舟山供電公司;浙江舟山海洋輸電研究院有限公司;
【基金】：國網(wǎng)浙江省電力公司科技項目(5211ZS1500GD) 國家重點研發(fā)計劃(2016YFB0900705) 國家電網(wǎng)公司科技項目(5211011600LF)資助
【分類號】：TM83

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