考虑负荷类型的配电网改进牛顿潮流算法

摘要

The traditional Newton algorithm has heavy calculation burden and low efficiency,its iterations and time will significantly increase when load type is no longer a constant power.In view of these problems,an improved Newton algorithm for power flow was proposed.The algorithm considers load type to constitute ZIP model with constant power load,constant current load and constant impedance load,and uses matrix splitting and relaxation method of matrix inversion to make the algorithm not only has simple and fast computed process,but also can improve algorithm efficiency and weaken influence of load type on iterations and time.The effectiveness of the algorithm was verified by using 33 nodes system to test and compare the iterations and times.Influence of load types on system voltage was analyzed though power flow calculation results,it shows that increase of constant impedance load proportion can improve system node voltage.%针对传统牛顿法存在计算量大、效率低,且当负荷类型不再是恒功率时其迭代次数与时间会明显增加等问题,提出了一种改进的牛顿潮流法.该算法考虑了负荷类型,将恒功率、恒电流和恒阻抗结合起来组成ZIP负荷模型,采用矩阵分裂以及矩阵求逆运算的松弛方法,使求解过程简单、快捷,有效地提高了算法效率,削弱了负荷类型变化对迭代次数以及迭代时间的影响.采用33节点系统测试比较了算法的迭代次数和迭代时间,证实了算法的有效性;并通过潮流计算结果分析了负荷类型对系统电压的影响,结果表明,恒阻抗负荷比例的增加有利于提高系统节点电压.