Renewable energy grid-tied ESS refers to the combination of renewable energy generation devices (solar power , wind power, etc.) with energy storage systems to achieve stable supply to the grid. This solution can solve the problem of large fluctuations and instability of renewable energy. In a grid-connected energy storage system, ESS is usually designed to work in coordination with renewable generation devices. When there is excess power generated by renewable generation devices, ESS stores it; When there is insufficient power generated, ESS releases stored power. In this way, renewable energy can supply power to the grid more stably, thereby improving its economic viability and reliability.