In order to effectively cope with distributed renewable energy output fluctuations and improve system flexibility, a multi-energy hybrid energy storage system can be formed based on battery energy storage. Multi-energy energy storage can realize the coupling and synergy between different energy types, and through a reasonable control system of charging and discharging power to realize the spatial and temporal translation of energy and the transformation of different energy types, to solve the problem of asynchronous nature of energy production and consumption, to ensure a stable supply of energy, and to improve the reliability, economy and efficiency of the power grid operation. Reliability and economy. In view of the current energy storage research less consideration of hybrid energy storage or multi-energy storage and multi-time scale regulation, this paper takes the voltage regulation of distribution system under multi-storage access as the research object, further optimizes the multi-storage model composed of electric and thermal energy storage, gives full play to the complementary characteristics of the storage and multi-energy coupling advantages, effectively solves the voltage over-limit of the distribution system caused by the fluctuation of the output of renewable energy, and improves the robustness and economy of the system operation. robustness and economy of system operation.