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Security and stability challenges in future power systems with high penetration Inverter-Based Resources (IBR) have been anticipated as the main barrier to decolonization. Grid-following IBRs may become unstable under small disturbances in weak grids, while, during transient processes, system stability and protection may be jeopardized due to the lack of sufficient Short-Circuit Current (SCC). To solve these challenges and achieve decarbonization, the future system has to be carefully planned. However, it remains unclear how both small-signal and transient processes can be considered during the system planning stage. In this context, this paper proposes a coordinated planning model of different resources to enhance system-level stability. The system strength and SCC constraints are analytically derived by considering the different characteristics of synchronous units and IBRs, which are further effectively linearized through a novel data-driven approach, where an active sampling method is proposed to generate a representative data set. The significant economic value of the proposed coordinated planning framework in both system asset investment and system operation is demonstrated through detailed case studies.
Chu et al. (Mon,) studied this question.