The Research On Distributed Dynamic Power Flow Based On Asynchronous Iteration Considering Frequency Change

In the existing distributed power flow algorithms, the influences of frequency changes to the system are rarely considered. This makes impossible to obtain an accurate simulation of the actual power system operation status in the distributed EMS/DTS. Because the dynamic flow algorithm can reflect the actual system more exactly, a method called distributed dynamic power flow based on asynchronous iteration mode considering frequency change is proposed in this paper. The whole idea of the algorithm is given. Two different levels model, coordinate layer-subsystem and generator unit-network unit, are used to represent the interconnected system. Subsystems are modeled in local system and coordinated layer is modeled in superior dispatching center. By changing few necessary data, decomposition and coordination calculation for multiple control centers can be realized. The generator unit is used to calculate the electromagnetic power send to the network unit and simulate frequency of the system. In the network unit, the power flow of the interconnected system can be calculated by distributed algorithm based on asynchronous iteration. By iterative solution between generator unit and network unit, the simulation of the frequency change and power flow solution can be obtained. In this article, we take the IEEE 118 and IEEE 9 node expanded system as an example to authenticate this method. The simulation results are the same as the real ones hence showing that the new algorithm is real and effective.