Analysis of Voltage Stability in Terms of Interactions of Q(U)-Characteristic Control in Distribution Grids

TL;DR

This paper investigates voltage stability in distribution grids with high renewable energy penetration by analyzing Q(U)-characteristic control interactions, introducing a new stability assessment approach using the circle criterion to improve control parametrization.

Contribution

It presents a novel stability assessment method based on the circle criterion for Q(U)-control interactions in distribution grids with high renewable energy integration.

Findings

The new approach effectively assesses stability in various grid configurations.

Control parametrization rules improve grid stability with high renewable penetration.

The method extends existing technical guidelines for distribution grid stability.

Abstract

As the amount of volatile, renewable energy sources in power distribution grids is increasing, the stability of the latter is a vital aspect for grid operators. Within the STABEEL project, the authors develop rules on how to parametrize the reactive power control of distributed energy resources to increase the performance while guaranteeing stability. The work focuses on distribution grids with a high penetration of distributed energy resources equipped with Q(U)-characteristic. This contribution is based on the stability assessment of previous work and introduces a new approach utilizing the circle criterion. With the aim of extending existing technical guidelines, stability assessment methods are applied to various distribution grids - including those from the SimBench project. Herein, distributed energy resources can be modelled as detailed control loops or as approximations, derived from technical guidelines.