A Stability Assessment Framework for Standalone Hybrid Renewable Energy Systems Under High Renewable Penetration

This project tackles the key technical problems of voltage and frequency instability in standalone hybrid renewable energy systems (HRES) when they contain a high share of renewable power. As conventional rotating inertia drops in inverter‑dominated microgrids, keeping the system stable becomes harder because loads change quickly and generation is intermittent. To address these issues, we present a complete stability‑assessment framework that uses: – Dynamic voltage‑deviation indices – Frequency‑response metrics – The Energy Valley Optimizer (EVO) to evaluate system behavior and find operating limits that satisfy stability constraints A case study of a remote‑community microgrid shows that the critical renewable‑penetration threshold is about **85 %**. Above this level, voltage and frequency

swings reduce system reliability. The project offers step‑by‑step guidance for: – Modeling the dynamic interactions between load and generation – Optimizing control parameters – Defining safe operating boundaries By simulating many penetration scenarios under different load profiles, the framework becomes a practical tool for planning, designing, and improving the stability of off‑grid hybrid power systems, supporting the move toward sustainable energy infrastructures.

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