Robust Grid-Forming Control Based on Virtual Flux Observer

TL;DR

This paper introduces a robust grid-forming control strategy for grid-connected converters using a virtual flux observer, enhancing stability and performance across different grid conditions.

Contribution

It presents a novel virtual flux observer-based synchronization and load angle control method for GFM control, improving robustness and stability.

Findings

Demonstrates strong robustness in stability and dynamics.

Validated through small-signal analysis and experiments.

Effective across varying and uncertain grid strengths.

Abstract

This paper investigates the design and analysis of a novel grid-forming (GFM) control method for grid-connected converters (GCCs). The core novelty lies in a virtual flux observer-based synchronization and load angle control method. The terminal voltage of the converter is directly regulated to provide voltage-source behavior. The control parameters are designed for decoupling and pole placement. The proposed method exhibits strong robustness in stability and dynamical performance across varying and uncertain grid strengths. The robust control performance of the proposed method is first demonstrated by small-signal analysis, then validated by experiments on a 20 kVA power conversion system.