一种含光伏电源的配电网电流保护的新方法

A New Method of Current Protection for Distribution Networks with Photovoltaic Power

通过分析含有光伏电源的配电网的故障电流特征,找到了一种仅利用故障电流的正序分量进行故障定位的方法。首先利用无故障支路的正序故障电流分量模值较小,故障支路的故障电流正序分量模值最大,判断出故障馈线;然后利用故障电流正序分量的增量来对含光伏电源的馈线上的故障段进行判断。该方法能有效对含有光伏电源的配电网进行保护。

By analyzing the characteristics of short-circuit current when fault occurs in distributi-on system with photov- ohaic power , a method of fault location using only positive sequence corn ponent with fault current is proposed. It shows that the modular of positive sequence component with fault current of non-fauh branch is smaller and the modular of pos- itive sequence component with fault curr-ent of fault branch is the largest. First, according to that the fault feeder can be dis-tinguished. Then by analyzing positive sequence component of fault current increment, the fault section of the fault feeder with photovoltaic power can be distinguished. The method can effecti-vely protect the distribution network with photovohaic power.