IBR의 동특성 감시를 위한 통합 고장 민감도 기반 WMU 최적 배치

Abstract

This paper proposes a Fault Sensitivity (FS)-based optimal placement strategy for Waveform Measurement Units (WMUs) to enhance the monitoring of complex dynamics in Inverter-Based Resources (IBRs)-dominated power systems. Overcoming the limitations of conventional, topology-only Measurement Redundancy (MR) methods, this study develops eight quantitative FS indices derived from Electromagnetic Transient (EMT) simulations to evaluate the physical response of each bus to transient and oscillatory events. In case studies on the IEEE 14-bus and 30-bus systems under Single-Line-to-Ground (SLG) fault and Sub-Synchronous Oscillation (SSO) scenarios, the proposed FS-based placement improved the integrated sensitivity score by up to 12.0% and 57.3%, respectively, compared to the MR-based approach. Physical waveform analysis further validates that the proposed method successfully identifies optimal observability points that most clearly capture critical dynamic phenomena, such as the inter-area propagation of electromechanical oscillations.