Work

Inner-Loop Controllers for Grid-Forming Converters

Year: 2025

Type: article

Abstract: This paper presents a detailed discrete-time implementation of an inner-loop voltage controller with a current limiter for grid-forming converters with an LC filter connected to the grid. The proposed approach utilizes a state feedback control law that depends on the states of both the converter and the internal model controller. Additionally, a resonant controller is designed to accurately track the fundamental frequency of the grid voltage. The stability of the proposed controller is analyzed for both virtual impedance and virtual admittance implementations. To validate the controller’s effectiveness, simulation results are provided using a Hardware-in-the-Loop (HIL) setup, alongside a comparison of different virtual impedance implementations.

Source: Applied Sciences

DOI: 10.3390/app15063007

Authors: Alexandre Trevisan Pereira, André Pacheco Meurer, Humberto Pinheiro

Institutions: Instituto Federal Sul-rio-grandense, Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul, Universidade Federal de Santa Maria

Language: English

Topic: Microgrid Control and Optimization

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $2,896