The Study On Network Topology And State Estimation Based On PMU

The network topology and the state estimation of power system is the foundational and important content in Energy Management System.With the fast development of power system in our country,it is higher demand advanced for the watch and control system of the real-time network status. So it is needed that foundational power system data provided by network topology and state estimation is in-time and correct. Aiming at research of network topology and state estimation based on PMU, this paper works out some design and discussion, and trys to apply some of new methods about.In the side of network topology research, all kinds of topology analysis methods about transmission network of power system are mostly studied.Firstly, methods based on depth-priority and width-priority are briefly realized. Secondly,the topology processor that tracks network modifications is introduced.In light of many voltage levels in the power system, this paper puts forward a new method.This method provides a fast calculation of local network topology according to the voltage level, and this method is improved by means of fast width-priority topology,and classification of the switch is drawled in this method for improving speed.This algorithm is simple, fast, effective, reliable and capacity for saving is very small. This method is especially suited to the partial variation of network topology caused by frequent operation of breakers.This paper also brings forward a fast topology method using characteristic of switches themselves.In last,a new topology algorithm model using Petri net is discussed.In the research on state estimation based on PMU, firstly the basic models and arithmetic of sate estimation are briefly introduced.Then various measurement models are studied, and the current measurement transforming method is advanced.Some models using PMU in state estimation are researched. It is also discussed that How PMU of different precisions influences the state estimation result and how to efficiently use various measurements of PMU to carry out SE.