Application of Energy Storage Systems in Renewable Energy

Abstract

The global energy transition is accelerating, with renewable energy becoming the primary driver of power capacity expansion. However, the intermittent and volatile nature of solar and wind energy poses challenges to grid stability. Energy storage systems are key to addressing these challenges. This paper systematically examines the application of energy storage systems in renewable energy, covering their mechanisms, technical classifications, typical application cases, and future development directions. Combining these with photovoltaic, wind, and hydropower applications, it analyzes their value in smoothing power output, increasing renewable energy consumption, and enhancing grid peak and frequency regulation and reliability. The study finds that energy storage systems can control photovoltaic output fluctuations to ±5%, achieve 100% compliance for wind power primary frequency regulation, and increase renewable energy consumption by 15%–35%. Case studies demonstrate the economic viability and feasibility of energy storage in various scenarios. While current challenges remain, such as high costs, efficiency limitations, and inadequate recycling systems, future development directions include innovations in solidstate and flow batteries, hybrid energy storage integration, digital twins and intelligent operations and maintenance, and improved market and policy mechanisms. The paper argues that energy storage systems will become a core supportive force in promoting high-proportion renewable energy integration and achieving the “dual carbon” goals.