AC/DC Frequency-Dependent Power Flow Jacobian: Quantifying Grid Support and Stability Implications

TL;DR

This paper introduces a frequency-dependent power flow Jacobian for AC/DC systems to evaluate support capabilities and reveals that increased support does not always improve grid stability, questioning existing technical assumptions.

Contribution

It presents a novel AC/DC frequency-dependent Jacobian analysis that links system support capabilities with stability implications, challenging conventional assumptions.

Findings

Support capabilities vary with frequency-dependent analysis.

Support does not necessarily enhance stability margins.

Narrow-band and AC-focused specs may not ensure performance.

Abstract

This letter proposes an AC/DC frequency-dependent power flow Jacobian analysis to identify the system support capabilities. In addition, the analyses reveal that system support capabilities do not necessarily enhance the system stability margin, suggesting that technical requirements of narrow-frequency-band and AC-side focused specifications may not lead to the expected performance of GFM.