Coordinated Scheduling Strategy for Source-Grid-Load-Storage Integrated System Considering Frequency Dynamic Security Constraint in a 100% Renewable Energy Scenario

Abstract

Developing a novel source-grid-load-storage integrated system in urban industrial zones abundant in new energy is a crucial approach for achieving energy self-management and efficient utilisation. However, in a 100% renewable energy scenario, the system lacks synchronous inertia support, facing dual challenges of frequency stability and the uncertainty of renewable energy output. To address the above issues, this paper proposes an innovative robust optimisation model for multi-type resource coordination and scheduling, considering both frequency dynamic security and the uncertainty of renewable energy output. The model integrates the frequency support capability of grid-forming (GFM) renewable stations, the suppression effect on renewable energy output and tie-line power fluctuations of a hybrid energy storage station consisting of battery energy storage systems (BESS) and advanced adiabatic compressed air energy storage (AA-CAES), as well as a flexible load demand response mechanism (DR). A case study conducted in an industrial zone of a city in China validated the effectiveness of the proposed scheduling strategy. It also demonstrates that the solution method effectively mitigates the underestimation of tail risks and ensures the rationality of the frequency security constraint linearisation method.