Power Control of Grid-Forming Converters Based on Full-State Feedback

TL;DR

This paper introduces a full-state feedback control method for grid-forming converter power loops, enabling precise eigenvalue placement and improved stability across various line impedances, verified through experiments.

Contribution

It presents a novel full-state feedback control approach for coupled power loops in grid-forming converters, applicable to all line impedance types, with a systematic parameter design procedure.

Findings

Eigenvalues can be arbitrarily placed for desired dynamic response

The method is effective across resistive, inductive, and complex line impedances

Experimental results confirm the control method's validity

Abstract

The active and reactive power controllers of grid-forming converters are traditionally designed separately, which relies on the assumption of loop decoupling. This paper proposes a full-state feedback control for the power loops of grid-forming converters. First, the power loops are modeled considering their natural coupling, which, therefore, can apply to all kinds of line impedance, i.e., resistive, inductive, or complex. Then a full-state feedback control design is used. By this way, the eigenvalues of the system can be arbitrarily placed to any positions in the timescale of power loops. Therefore, the parameters can be directly chosen by the predefined specifications. A step-by-step parameters design procedure is also given in this paper. Experimental results verify the proposed method.