一种改进的配电网牛顿潮流算法

An Improved Newton Power Flow Algorithm for Distribution Network

针对配电网的特点和常用前推回代潮流算法存在的不足,提出了一种改进的配电网牛顿潮流算法。该算法从基于基尔霍夫电流定律的Ybus算法出发,将迭代得到的结果作为电流注入模型的牛顿法的初值进行潮流分析。算法通过修改雅可比迭代矩阵元素对PU节点进行处理,通过变换系统节点电流方程来解决多平衡节点系统问题,既可用于放射形配电网,又能解决含有环网的配电系统。该算法物理意义清晰,容易实现,收敛性好,给出的算例验证了算法的可行性。

According to the characteristics of the power distribution system and the disadvantages of the back/forward sweep method frequently used,an improved Newton power flow algorithm for the distribution system is presented.Starting from Ybus algorithm that is based on Kchhoff Current Law,it analyzes the power flow by regarding the iterative results as the initial values to Newton power flow method based on the current-injection model.In the presented algorithm,the PU nodes are processed by amending Jacobian iterative matrix elements and the problems on systems of multi-balance buses are settled through converting the current equation of the system nodes.Not only can it fit in with the radial distribution nets,but also can solve the problem of the distribution system with loops.The algorithm is liable to implement and has an obvious physical meaning as well as a good convergence characteristic.The example given by the text shows the feasibility of the proposed algorithm.