多条件下配网线路载流量的分析研究

Analysis and Research on the Current-Carrying Capacity of Distribution Network Under Multi Conditions

根据现有输电线路实际情况,充分挖掘配网线路载流潜力,可在用电高峰期和线路故障等情况下提高线路输送能力。主要从稳态热平衡模型和暂态热平衡模型的角度开展多条件下配网线路载流量的研究,在稳态热平衡模型中分析了日照强度、直流电阻、交流电阻、散热因素对线路载流量的影响;在暂态热平衡模型中分析了输电线路在发生故障,引起线路载流量变化,导致线路运行温度变化的故障状况。在确定了各国载流量计算的边界条件的同时,分析了日照强度、风速及环境温度对导线载流量的影响,结果表明:随着日照强度的上升,导线载流量呈现下降趋势;随着风速的增加,导线载流量呈现上升趋势;随着环境温度的上升,导线载流量呈现下降趋势。

If we can fully tap the potential of current-carrying capacity of the distribution network line according to the actual situation,transmission capacity of the line can be improved in the case of peak load and line fault.In this paper,the research on the network current-carrying capacity of the cable distribution network is carried out from the point of view of the steady state thermal equilibrium model and the transient state thermal equilibrium model.In the steady state thermal equilibrium model,the influence of sunshine factor,DC resistance,AC resistance and heat dissipation factor on the current-carrying capacity of the line were analysed.And in the transient state thermal equilibrium model,the change of current-carrying capacity leads to the temperature change of line when the transmission line in the event of failure was analyzed.When the current-carrying capacity calculation of various boundary conditions were determined,the effect of sunshine intensity,wind speed and ambient temperature on current-carrying capacity were analyzed.The results showed that with the rise of sunlight intensity,current-carrying capacity showed a downward trend,and with the increase of wind speed,current-carrying capacity of the wire showed a rising trend,moreover,with the rise of environmental temperature,current-carrying capacity of the wire show a downward trend.