open access publication

Article, 2024

Adaptive power-sharing strategy in hybrid AC/DC microgrid for enhancing voltage and frequency regulation

International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, 1879-3517, Volume 156, Page 109696, 10.1016/j.ijepes.2023.109696

Contributors

Mahmoudian, Ali 0000-0003-3486-4408 [1] Garmabdari, Rasoul [1] Bai, Feifei 0000-0003-4507-2027 [1] Guerrero, Josep M 0000-0001-5236-4592 [2] Mousavizade, Mirsaeed [1] Lu, Junwei 0000-0001-9942-4265 (Corresponding author) [1]

Affiliations

  1. [1] Griffith University
    2. [NORA names: Australia; Oceania; OECD];
  2. [2] Aalborg University
    3. [NORA names: AAU Aalborg University; University; Denmark; Europe, EU; Nordic; OECD]

Abstract

This paper introduces a new adaptive control strategy for power-sharing in a hybrid AC/DC microgrid (HMG). The existing interlink converter (ILC) control methods exhibit limitations under heavy load and contingency conditions. To overcome this limitation, a bidirectional control strategy is proposed for the ILC, which effectively coordinates battery energy storage systems (BESSs) in both sub-grids while mitigating stress on the ILC and BESSs. The control strategy utilises the state of charge (SoC) and instantaneous power of the BESSs to stabilise frequency and DC voltage on the AC and DC sub-grids, respectively, enabling autonomous operation and plug-and-play capability. Stability analysis employing root locus and a stress level relaxation index for BESSs are presented. Performance evaluation based on the moving mean square error criterion validates the effectiveness of the control strategy. Simulation results using MATLAB/SIMULINK demonstrate the superior performance of the proposed strategy in regulating both voltage and frequency within the system over the existing control approaches. Furthermore, the proposed approach significantly reduces stress levels on the BESSs in different operation conditions.

Keywords

AC, AC/DC microgrid, DC sub-grid, DC voltage, MATLAB/Simulink, SoC, adaptive control strategy, analysis, approach, battery energy storage system, capability, charge, conditions, contingency, contingency conditions, control, control approach, control method, control strategy, converter, criteria, effect, energy storage system, enhanced voltage, error criterion, evaluation, frequency, frequency regulation, heavy load, hybrid, hybrid AC/DC microgrid, index, instantaneous power, interlinking, interlinking converter, levels, limitations, load, loci, mean square error criterion, method, microgrid, mitigate stress, moving, operating conditions, operation, performance, performance evaluation, plug-and-play capability, power, power-sharing, power-sharing strategy, reduce stress levels, regulation, relaxation index, results, root, root locus, simulation, simulation results, square error criterion, stability, stability analysis, state, state of charge, storage system, strategies, stress, stress levels, sub-grid, superior performance, system, voltage

Funders

  • Australian Research Council

Data Provider: Digital Science

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