As the physical carrier of Energy Internet

regional integrated energy system(RIES)has become an important role for improving comprehensive energy utilization efficiency

renewable energy consumption

energy supply reliability

energy saving and emission reduction. The planning of RIES encounters many challenges

such as industry boundaries

policies

regional differences and techniques. In this paper

the key problems of RIES planning are discussed including multi-energy coupling

load forecasting

technical economy and optimization modelling. The domestic and foreign relative researches are summarized systematically. Based on the latest research progress

a universal energy flow model

planning model and solution process covering the source

network

load and storage of district integrated energy system are summarized

and the future research directions are prospected.