基于网损等值负荷模型的直流潮流迭代算法

Iterative Algorithm of DC Power Flow Based on Network Loss Equivalent Load Model

为提高直流潮流计算精度,研究了标准直流潮流模型中由于忽略支路电阻而带来的有功平衡问题,给出了按比例调整出力或负荷、引入网损等值负荷模型这2种有功平衡方法。为了使网损等值负荷模型的应用不依赖于交流潮流的收敛性,重点提出一种改进的直流潮流算法,该算法通过网损迭代得到等值负荷的大小,且保留了标准直流潮流求解的便利性和快速性。实际电网算例的计算结果表明,提出的改进直流潮流算法与标准直流潮流算法相比,计算结果的精度大幅提高,在交流潮流不收敛的情况下,可作为一种有效的近似潮流计算方法。

The active power balance problem caused by the network loss in DC power flow algorithm is researched.Two methods are proposed to achieve active power balance,including adj usting the generator output or power load,and adopting equivalent load model.In order to apply this equivalent load model without dependence on convergent initial power flow,a new effective iterative method is also presented to calculate the equivalent loads.The improved DC power flow algorithm proposed retains the linearity and rapidity of the standard DC power flow algorithm,while achieving much higher calculation accuracy. Plenty of actual calculation examples show that the improved DC power flow algorithm is effective and practical,as the power flow result calculated by the improved algorithm is much closer to the actual value than by the standard algorithm.