单相、三相潮流重载算法的研究

Study on overload algorithm of single-phase and three-phase power flow

研究了一种适用于单相、三相网络的重载潮流算法。首先,对单相、三相网络,分别构造重载节点电压方程。对单相系统,方程中的各个元素为单一复数元素;对三相系统,方程中的元素被重载为3×3阶元素。然后,对单相、三相网络,构造统一的重载潮流迭代方程。通过矩阵变化,分别构造PQ节点迭代方程和PV节点迭代方程。对PQ节点迭代方程,采用传统方法求解;对PV节点迭代方程,提出一种新型的迭代方法。最后,应用多个IEEE标准算例测试算法。算例结果表明,该算法具有计算速度快,收敛可靠,适用性强的优点,适合应用于电力系统单相、三相网络在线计算。

An overload power flow algorithm is studied for single-phase and three-phase power system. Firstly, overload nodal voltage equation is constructed for single-phase and three-phase network. All elements in the equation are single complex numbers for single-phase network and 3 × 3 complex numbers for three-phase one. Then, a uniform overload load flow iteration equation is constructed for both networks. The iteration equation for PQ nodes and PV nodes is differently treated by matrix transformation. The traditional method is used to resolve PQ nodes and a new iteration method is studied to resolve PV nodes. At last, many IEEE examples are used to test the algorithm. The calculation result shows that the algorithm has the advantage of fast calculation, reliable convergence and powerful applicability. And the algorithm is suitable for single-phase and three-phase power system＇s online calculation.