A Comparative Study of Control Schemes Based on PI Controllers and State-Feedback Control for Grid-Connected Converters

Marek Michalczuk

doi:10.2478/pead-2026-0014

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A Comparative Study of Control Schemes Based on PI Controllers and State-Feedback Control for Grid-Connected Converters

Power Electronics and Drives

Volume 11 (2026): Issue 1 (January 2026)

By: Marek Michalczuk

Open Access

|May 2026

Abstract

This paper provides a comparative analysis of two classical control strategies applied to a grid-connected voltage-source converter (VSC) with an L-type filter. The first method employs a cascade control structure with proportional–integral controllers, while the second uses a full-state feedback controller designed via the linear quadratic regulator method. A linearised state-space model of the converter, including controller and modulation delays, is developed and consistently used for both control schemes to enable a fair comparison. The control approaches are evaluated through detailed numerical simulations under identical operating conditions, including grid voltage disturbances, load changes and reference variations. Performance is assessed based on transient response, disturbance rejection, control effort, robustness to parameter changes and stability margins. Disk margin (DM) analysis offers a conservative, comprehensive evaluation of closed-loop stability. The results show that, although both strategies attain similar settling times, the full-state feedback controller offers superior disturbance rejection, reduced peak currents and notably larger stability margins. The paper aims to provide practical insights and guidelines for selecting suitable control strategies for power electronic systems.

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Articles in this issue

DOI: https://doi.org/10.2478/pead-2026-0014 | Journal eISSN: 2543-4292 | Journal ISSN: 2451-0262

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Language: English

Page range: 216 - 229

Submitted on: Jan 28, 2026

Accepted on: Apr 28, 2026

Published on: May 25, 2026

Published by: Wroclaw University of Science and Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Keywords:

grid-connected converter,

full state feedback,

stability analysis,

voltage-oriented control

Related subjects:

Computer sciences,

Artificial intelligence,

Engineering,

Electrical engineering,

Electronics

© 2026 Marek Michalczuk, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 11 (2026): Issue 1 (January 2026)