Measurement-Based Estimation of System State Matrix for AC Power Systems with Integrated VSCs

TL;DR

This paper introduces a model-free, measurement-based approach to estimate the system state matrix and identify electromechanical modes in AC power systems with integrated VSCs, enhancing stability analysis without requiring detailed system parameters.

Contribution

The paper presents a novel measurement-based method that accurately estimates system modes and parameters in AC power systems with VSCs without prior knowledge of network topology.

Findings

Accurately identifies electromechanical modes and damping ratios

Estimates mode shapes and participation factors effectively

Works without detailed system parameters

Abstract

In this paper, a wide-area measurement system (WAMS)-based method is proposed to estimate the system state matrix for AC system with integrated voltage source converters (VSCs) and identify the electromechanical modes. The proposed method is purely model-free, requiring no knowledge of accurate network topology and system parameters. Numerical studies in the IEEE 68-bus system with integrated VSCs show that the proposed measurementbased method can accurately identify the electromechanical modes and estimate the damping ratios, the mode shapes, and the participation factors. The work may serve as a basis for developing WAMS-based damping control using VSCs in the future.