Decentralized adaptive virtual impedance control for robust power sharing and circulating current suppression in parallel inverters for three-phase islanded microgrid applications

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27240%2F25%3A10259181" target="_blank" >RIV/61989100:27240/25:10259181 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61989100:27730/25:10259181

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2352484725007486" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2352484725007486</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.egyr.2025.12.009" target="_blank" >10.1016/j.egyr.2025.12.009</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Decentralized adaptive virtual impedance control for robust power sharing and circulating current suppression in parallel inverters for three-phase islanded microgrid applications

Popis výsledku v původním jazyce

Islanded microgrids (IMGs) with complex line impedances face persistent challenges in achieving accurate reactive power sharing and suppressing circulating currents due to mismatched line impedances, load variations, and the intrinsic coupling between active and reactive power control. These issues can degrade voltage quality and stability, increase power losses, and threaten system stability, particularly in multi- distributed generation (DG) units-based microgrids. This paper proposes a novel, fully decentralized adaptive complex virtual impedance (ACVI) mechanism within the conventional droop control framework formulated in the synchronous dq reference frame. Unlike existing fixed or partially adaptive virtual impedance approaches, the proposed approach simultaneously and adaptively adjusts both virtual resistance and virtual inductance of each DG unit based solely on locally measured reactive power and voltage amplitude, eliminating any need for communication links or explicit line impedance estimation. A power decoupling mechanism is incorporated into the control scheme to mitigate active-reactive coupling and improve transient response. Furthermore, the control architecture combines outer voltage and inner current regulation loops equipped with decoupling elements and line current feedforward compensation to reinforce transient performance and disturbance rejection capabilities. The adaptive impedance adjustment also introduces additional system damping, ensuring robust control performance under steady-state operation, abrupt load changes, and DG disconnection scenarios. Comprehensive small-signal stability analysis is conducted to guide parameter tuning and confirm robust dynamic performance. The effectiveness of the proposed controller is validated through extensive Hardware-in-the-Loop real-time simulations using an OPAL-RT OP5700 real-time simulator. Results demonstrate that the proposed ACVI method achieves highly accurate active and reactive power sharing with very lower reactive power sharing error, significantly suppresses circulating currents, faster transient response, and maintains IMG voltage within 5 % drop of its nominal value under abrupt load changes and DG disconnections. Owing to its communication-free design, scalability, and ease of implementation, the proposed ACVI-based control scheme is well suitable for low-, medium-, and high-voltage islanded microgrids with complex impedance characteristics integrating diverse inverter-interfaced renewable energy sources.

Název v anglickém jazyce

Decentralized adaptive virtual impedance control for robust power sharing and circulating current suppression in parallel inverters for three-phase islanded microgrid applications

Popis výsledku anglicky

Islanded microgrids (IMGs) with complex line impedances face persistent challenges in achieving accurate reactive power sharing and suppressing circulating currents due to mismatched line impedances, load variations, and the intrinsic coupling between active and reactive power control. These issues can degrade voltage quality and stability, increase power losses, and threaten system stability, particularly in multi- distributed generation (DG) units-based microgrids. This paper proposes a novel, fully decentralized adaptive complex virtual impedance (ACVI) mechanism within the conventional droop control framework formulated in the synchronous dq reference frame. Unlike existing fixed or partially adaptive virtual impedance approaches, the proposed approach simultaneously and adaptively adjusts both virtual resistance and virtual inductance of each DG unit based solely on locally measured reactive power and voltage amplitude, eliminating any need for communication links or explicit line impedance estimation. A power decoupling mechanism is incorporated into the control scheme to mitigate active-reactive coupling and improve transient response. Furthermore, the control architecture combines outer voltage and inner current regulation loops equipped with decoupling elements and line current feedforward compensation to reinforce transient performance and disturbance rejection capabilities. The adaptive impedance adjustment also introduces additional system damping, ensuring robust control performance under steady-state operation, abrupt load changes, and DG disconnection scenarios. Comprehensive small-signal stability analysis is conducted to guide parameter tuning and confirm robust dynamic performance. The effectiveness of the proposed controller is validated through extensive Hardware-in-the-Loop real-time simulations using an OPAL-RT OP5700 real-time simulator. Results demonstrate that the proposed ACVI method achieves highly accurate active and reactive power sharing with very lower reactive power sharing error, significantly suppresses circulating currents, faster transient response, and maintains IMG voltage within 5 % drop of its nominal value under abrupt load changes and DG disconnections. Owing to its communication-free design, scalability, and ease of implementation, the proposed ACVI-based control scheme is well suitable for low-, medium-, and high-voltage islanded microgrids with complex impedance characteristics integrating diverse inverter-interfaced renewable energy sources.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20700 - Environmental engineering

Projekt

<a href="/cs/project/TN02000025" target="_blank" >TN02000025: Národní centrum pro energetiku II</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Energy Reports

ISSN

2352-4847

e-ISSN

—

Svazek periodika

14

Číslo periodika v rámci svazku

1-17

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

5639-5655

Kód UT WoS článku

001638188700004

EID výsledku v databázi Scopus

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