Stability and Sensitivity Analysis of Multi-Vendor, Multi-Terminal HVDC Systems

TL;DR

This paper presents a frequency-domain approach to analyze the stability and sensitivity of multi-vendor, multi-terminal HVDC systems, identifying potential instability causes through impedance-based methods and case studies.

Contribution

It introduces a multi-level sensitivity analysis method using frequency-domain sensitivity functions for HVDC system stability assessment.

Findings

Impedance-based stability analysis effectively identifies instability risks.

Sensitivity analysis pinpoints root causes of potential instability.

Validation confirms the approach's accuracy with electromagnetic transient simulations.

Abstract

The stability of multi-vendor, multi-terminal HVDC systems can be analyzed in frequency domain by black-box impedance models using the generalized Nyquist stability criterion. Based on the impedance stability analysis, a multi-level sensitivity analysis approach using frequency-domain sensitivity functions is proposed to identify the root cause of potential instability. Case studies on a four-terminal HVDC system are carried out for stability and sensitivity analysis based on the impedance measurement in PSCAD. The analysis results are finally validated by electromagnetic transient simulations.