Investigation On Dynamic Load Flow And Network Topological Analysis

Power flow calculation is a basic tool for system programming and operational analyzing in power system. The algorithm has been put forward by the deep research of researchers in and abroad for several decade years. But because of the complexity of power system , more or less the traditional algorithms have some certain limitations. The traditional load flow isn't easy to converge when a large unbalance power exists which coursed by the change of node injection power. And the result doesn't conform to the reality.The dynamic load flow model be put forward in this paper is to have been considered the frequency static characteristic of load and generator on the foundation of traditional load flow, the core is flow calculation and frequency calculation. In dynamic load flow calculation the unbalance power which coursed by the change of node injection power is distributed according to the frequency static characteristic of each generator between all generators, and gets the change of systematic frequency follow load as well as generators' active power. So, it has surmounted the condition that flow convergence to be not good and result is inconsistent with reality which since balanced node undertakes unbalanced power alone in traditional load flow. Obviously, relative to traditional load flow, dynamic load flow algorithm can go on for the actual condition that system runs, is more effective and simulated, it is a great advance.A lot of power programs that include flow calculation are basic with bus admittance matrix. And bus admittance matrix is also to make rubbing with the change of network topological structure. If we can not modify network topological structure in time accurately along with the switch located state change of real time to make rubbing, will cause result mistake. The thesis links up dynamic load flow analysis and network topological analysis in power system as a whole to take dynamic load flow calculation of real time. This project has broad application in practice.The thesis also validates the rationality of the dynamic power flow algorithm through emulating on a typical system. The result indicates that the new algorithm has provided a more ideal tool for analyzing the power flow state of power system after the change of system loads well and truly. Finally we have simulated untie row and parallel operation of electrical network successfully according to the theory of dynamic load flow and network topological analysis.