# The Impact of Power-Electronics-Based Load Dynamics on Large-disturbance Voltage Stability

## TL;DR

This paper investigates how the fast dynamics of power-electronics-based loads, like electric vehicles, affect large-disturbance voltage stability, revealing new analytical insights and stability measures.

## Contribution

It introduces a novel analysis framework for voltage stability considering PE-based loads and estimates the Region of Attraction using nonlinear dynamical system theories.

## Key findings

- PE-based loads significantly influence voltage stability.
- A critical clearing time for disturbances is identified.
- Nonlinear analysis methods effectively estimate stability regions.

## Abstract

This paper establishes a new context where the power-electronics-based (PE-based) load, represented by Plug-in Electric Vehicles, dominates the total load composition in power systems. The inherent fast dynamics of PE-based load make conventional approaches of voltage stability analysis unsuitable. Under the new context, the mechanism and impacts of voltage instability under large disturbances have been analytically revealed. The Region of Attraction (ROA) of the stable equilibrium point has been estimated through nonlinear dynamical system theories, which implies a critical clearing time post grid disturbance.