A Node-Level Distributed Power Flow Based on Newton-Raphson Method

In the future power system, it is necessary to develop a power flow method that can protect the privacy information of generators and electricity purchasers, and alleviate the calculation pressure of the central calculator. In this paper, a node-level distributed power flow method based on the Newton-Raphson method is established. First, the method regards a single node in the power network as an agent (capable of independent computing devices), and then constructs a single node power balance equation. Taking the voltage of the neighbor node as a known invariant and using the first-order Taylor approximation, the iterative formula of the node voltage is derived. This method disperses the computational load confronted in the central processor by constructing an iterative formula for a single node. In addition, each node only needs the voltage value of its neighboring nodes for computation. Hence, this method can well protect the privacy information of generators and electricity purchasers. By simulating several IEEE systems, the results show that the distributed method and the centralized method get the same answer, which means that the distributed method is effective.