I. Introduction
The output of distributed renewable energy has strong randomness and volatility, and its large-scale grid-connection will bring severe challenges to the safe operation of the distribution system, resulting in a series of problems [1]. With the increasingly close connection between electric power system and thermal system, an electric-heat system (EHS) is gradually formed. The integrated energy distribution system can break the barriers of a single, decentralized energy system, expand the operation boundary of the power system through multi-energy complementarity and multi-energy integration, improve the flexibility of the system, effectively promote the consumption of renewable energy, and improve energy utilization efficiency [2] - [4].