Coordinated Planning for Stability Enhancement in High IBR-Penetrated Systems

TL;DR

This paper introduces a coordinated planning model that optimally integrates synchronous condensers and GFM IBRs to enhance stability in future power systems with high inverter-based resource penetration, addressing stability and protection challenges.

Contribution

It presents a novel data-driven coordinated planning framework that considers stability constraints and system strength, improving decarbonization efforts in power system planning.

Findings

Enhanced system stability with integrated resources

Economic benefits demonstrated through case studies

Effective linearization of complex constraints

Abstract

Security and stability challenges in future power systems with high penetration Inverter-Based Resources (IBR) have been anticipated as one of the main barriers to decarbonization. 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 stabilities can be considered during the system planning stage. In this context, this paper proposes a coordinated planning model of different resources in the transmission system, namely the synchronous condensers and GFM IBRs to enhance system 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.