An Evaluation Method for Aggregated Response Capability of Distributed Resources in Virtual Power Plants

This paper explores Virtual Power Plants (VPP) as integrated platforms for coordinating distributed energy resources (DER) in distribution grids, systematically enhancing their aggregated response capability to support grid flexibility and market participation. By addressing gaps in existing evaluation frameworks, a multi-dimensional assessment model is proposed, integrating dynamic indicators such as ramp rates, response time, and sustained regulation accuracy. An optimization-driven methodology quantifies the VPP's global response capability under coupled constraints, including DER operational limits and grid code compliance. Case studies simulate 24-hour scenarios, generating response bandwidth curves that reveal temporal variations in available flexibility. The results demonstrate improved alignment between theoretical capacity and practical dispatchability, validated through comparative analyses. Derived metrics offer dual benefits: technical parameters guide real-time grid coordination, while quantitative indices enable operators to prioritize resource upgrades and refine control strategies for enhanced VPP resilience.