High penetration of distributed generators

controllable loads

such as electric vehicles

energy storage systems

and access and application of sheer number of measuring devices present the state estimation program of active distribution network with many challenges in accuracy and efficiency. Firstly

this paper briefly summarizes the existing research results of traditional distribution network state estimation. Then the research status of examining state estimation technique in active distribution network is comprehensively presented

including the modeling of novel pseudo-measurements

the efficient improvement of the state estimation algorithm and the optimal meter placement. Finally

several aspects that should be focused on in future development of state estimation of active distribution networks are outlined.