配电线路电缆化时的电压分布特性及感性无功补偿的仿真研究

通过MATLAB,以IEEE33节点10kV配电网算例,就轻载时部分线路电缆化时的电压和无功进行仿真分析,结果表明电缆线路轻载时会出现无功倒送和电压越上限现象。为此,针对轻载时电缆线路的首、中和末端节点的感性无功补偿进行了仿真研究,结果表明,对补偿点之后的各节点电压,首端补偿降压作用微弱,中间补偿降压作用明显,末端补偿降压作用最好;中间补偿有功线损最小。结合电压和降损的综合效果,认为电缆线路的感性无功补偿,应以中间节点补偿为首选方案。

Taking the IEEE33 node 10kV distribution network as an example,the voltage and reactive power of some lines under light load are simulated and analyzed by MATLAB.The results show that the reactive power reversal and the upper limit of voltage will occur when the cable line is light load.For this reason,a simulation study is carried out on the inductive reactive power compensation of the first,middle and end nodes of the cable line under light load.The results show that for the voltage of each node after the compensation point,the first end compensation step-down effect is weak,and the intermediate compensation step-down effect is obvious.The end compensation step-down effect is the best,and the active line loss of intermediate compensation is the minimum.Combined with the comprehensive effect of voltage and loss reduction,it is considered that the intermediate node compensation should be the preferred scheme for inductive reactive power compensation of cable lines.