Research on distribution system state estimation with photovoltaic generation

A large number of photovoltaic generation(PVG) is introduced into distribution network, and state estimation is an serious problem to accurately estimate the output of the PVG and the state of distribution system to ensure stable and reliable operation. Characteristics of PVG is analyzed and unmonitored and measured PVG state estimation model is proposed in this paper. Improved algorithm based on the square of the branch current and branch power is proposed for distribution system state estimation with PVG. An example is to verify the validity of the two proposed photovoltaic model, and from the access location and penetration point, this paper analyses the impact of PVG on distribution state estimation on PG&E-69 nodes system.