Abstract: With the development of enterprises and the increase of production capacity, power users, especially industrial and commercial users, gradually find it difficult to meet the growing demand for electricity with the capacity of transformers. By adding new energy equipment such as photovoltaics and energy storage, dynamically supplementing the capacity of user distribution systems, increasing system capacity during peak electricity consumption to meet load electricity demand, and storing electricity during low electricity consumption periods, achieving peak valley arbitrage, it has become an innovative power solution. This article takes the dynamic capacity expansion and renovation of a certain industrial and commercial park as an example to discuss the application of new energy photovoltaic and energy storage technologies in the capacity expansion of distribution user power systems.