Renewable Energy Integration with Energy Storage and Microgrids: Control Strategies, Polymer-Enabled Technologies, and Future Grid Trends

The global transition toward renewable energy is fundamentally reshaping power systems, introducing challenges related to variability, reduced inertia, and the growing need for operational flexibility. Energy storage systems (ESS) and microgrids have emerged as key enablers for reliable and resilient renewable integration, providing services such as energy shifting, frequency regulation, voltage support, and islanded operation. Despite significant progress, existing literature often treats materials innovation and system-level grid operation in isolation, limiting a holistic understanding of their combined impact. This review presents an integrated perspective on renewable energy sources, energy storage, and microgrid architectures, with emphasis on hierarchical and data-driven control strategies and energy management frameworks. It highlights the role of polymer-based materials in enhancing the safety, durability, and lifecycle performance of storage systems, and examines emerging trends including grid-forming inverters, hybrid storage configurations, and autonomous microgrids. By bridging materials science, power electronics, and control engineering, this work provides both researchers and practitioners with a structured knowledge base that supports resilient grid planning, informed policy development, and the deployment of sustainable, renewable-dominated power systems.