Research On Smart Distribution Network State Estimate

The popularity of the concept of third industrial revolution and Energy Internet greatly promoted the development of smart grid technology.As an important part of the smart grid,developing intelligent distribution network energy is of great significance for speeding up the construction of the Energy Internet.In this paper,smart distribution power flow calculation,solving the global optimal solution of state estimate and robust state estimation method have been studied.Firstly,the power flow calculation is the premise of state estimation,in this way,a distribution network power flow calculation method is proposed based on forward and backward substitution,which can be applied to three-phase balanced and unbalanced three-phase distribution power flow calculation,improving the convergence of the state estimation and calculation speed.Secondly,a weighted least squares state estimation model based on semi-definite programming and method for solving the global optimal solution have been proposed.By using a sparse semi-definite programming technique,computational efficiency of least square state estimation method is improved.Thirdly,a robust state estimation method has been proposed based on measurement uncertainty theory.The proposed method estimates less susceptible to the adverse impact of data,has a strong anti-poor,while also having a good convergence.Finally,the IEEE 33 and IEEE 34 node distribution systems are utilized to verify the validity of the proposed methods.