中低压直流配电网线损计算与分析

伴随着功率半导体器件、电力电子器件的发展与成熟,直流技术应用在电力系统配电网中受到越来越多的关注。文中建立了直流配电网各元件损耗的数学模型,利用PSCAD仿真技术分析元件模型的可行性并选定元件损耗的计算参数,分析交、直流配电网及其元件在不同比例直流负荷、轻重负载下的损耗情况,提出交、直流配电网线损拐点的预测区间,从能耗的角度给出直流配电网替代交流配电网的可能性。研究表明,直流配电网线损率在直流负荷比例为50%～60%区间内低于交流配电网,且直流负荷比例越重,直流配电网较于交流配电网具有更好的节能效果。

Calculation and Analysis of Line Loss of Medium - low Voltage DC Distribution Network

With the development and maturity of power semiconductor devices and power electronic devices, the application of DC technology in power system distribution network has received more and more attention. In this paper, the mathematical model of the components loss of DC distribution network is established. The feasibility of component model is analyzed by PSCAD simulation technique and the calculation parameters of component loss are selected to analyze the loss of AC and DC distribution networks and their components under different proportion DC load The potential of the DC distribution network to replace the AC distribution network is given from the point of view of energy consumption. The results show that the DC loss rate of the DC distribution network is lower than that of the AC distribution network with the DC load ratio of 50% ~ 60%, and the proportion of the DC load is heavier. The DC distribution network has better energy saving than the AC distribution network effect.