Hybrid Distributed and Decentralized Secondary Control Strategy to Attain Accurate Power Sharing and Improved Voltage Restoration in DC Microgrids

Silva, Waner Wodson A. G.; Oliveira, Thiago Ribeiro de; Donoso-Garcia, P.F.

doi:10.1109/tpel.2019.2951012

Cited by 35 publications

(13 citation statements)

References 34 publications

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“…In view of the different capacity of BESSs, the improved droop control based on relative capacity is proposed to achieve SOC equalization [18]. The influence of different line resistance is not considered in the SOC balancing control strategies proposed in [15][16][17][18]. Due to the influence of different line resistance, it is difficult to achieve accurate power sharing and SOC balancing simultaneously.…”

Section: Introductionmentioning

confidence: 99%

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Feedback control strategy for state‐of‐charge balancing and power sharing between distributed battery energy storage units in DC microgrid

Ding

Wang

Zhou

et al. 2023

IET Power Electronics

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Different line resistances between battery energy storage systems (BESSs) and the bus cause the problem of state-of-charge (SOC) unbalance between the batteries. SOC unbalance brings about battery over-charge or over-discharge, which reduces the battery life. This paper proposes an SOC feedback control strategy to achieve both output power sharing and SOC equalization between the BESSs. The average SOC of the batteries is set as the reference of each SOC control loop, and the control objectives are achieved by regulating the output voltage of the energy storage converters. The state space model of the proposed control method is established for stability analysis and control parameter design. The parameters are then designed in detail according to the dynamic and steadystate performance. Simulation and experiment verified that the proposed control strategy can achieve accurate SOC equalization and output power sharing when the line resistances and the battery capacities are different.

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Section: Introductionmentioning

confidence: 99%

“…Aiming at the problem of the bus voltage drop caused by the droop coefficient, a droop control method based on low bandwidth communication is proposed to improve the bus voltage compensation accuracy in [16]. In [17], a distributed secondary control based on droop control is proposed to achieve power sharing and bus voltage restoration.…”

Section: Introductionmentioning

confidence: 99%

Feedback control strategy for state‐of‐charge balancing and power sharing between distributed battery energy storage units in DC microgrid

Ding

Wang

Zhou

et al. 2023

IET Power Electronics

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“…A robust strategy such as the SMC strategy has been used in the secondary layer for disturbance rejection and controlling the SoC of battery ESSs (BESS) considering parametric uncertainties of MG [35]. Also, different kinds of the literature have studied distributed secondary control of dc MGs [28]- [30] for achieving proportional power-sharing and improve the voltage regulation [36], accurate power allocation [37], and managing the SoC of ESSs [38], [39].…”

Section: Introductionmentioning

confidence: 99%

Integrated Nonlinear Hierarchical Control and Management of Hybrid AC/DC Microgrids

Biglarahmadi

Ketabi

Baghaee

et al. 2022

IEEE Systems Journal

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Increasing the usage of distributed generations (DGs) leads the microgrids (MGs) to develop. Considering the existence of alternating current (ac) loads and sources and concerning increasing direct current (dc) loads and sources, hybrid ac/dc MGs have been used to have the advantages of both ac and dc MGs and reduce the drawbacks of them. By integrating the DG units in hybrid ac/dc MGs. Hence, a proper control method is required in such MGs to achieve precise voltage regulation and power-sharing, desired power quality, high efficiency, and high reliability. This article focused on nonlinear exponential control and distributed secondary control schemes to properly control the MG and form an integrated nonlinear hierarchical control and management for hybrid ac/dc MGs. Finally, to evaluate the proposed nonlinear control strategy's performance, offline digital time-domain simulation studies are carried out on a test MG system in MATLAB/Simulink environment. The results are also compared with previously reported methods. The simulation results and the comparisons showed that the proposed methods could properly share the power among subgrids and DGs in both ac and dc subgrids. In contrast, the proposed control scheme can prove its effectiveness and superiority over conventional controllers.

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“…A lot of researches have been performed about the droop control method in DC microgrids. In the literature, the droop control strategies have been implemented in four main categories including conventional and variants of the droop control [14][15][16], virtual framework structure-based method [17], constructed and compensated based method [18,19], and the hybrid droop/signal injection method [20]. All of these strategies are implemented using conventional (2D) droop control.…”

Section: Introductionmentioning

confidence: 99%

A novel power management strategy based on combination of 3D droop control and EKF in DC microgrids

Saravi

Sakhaei

Kalantar

et al. 2021

IET Renewable Power Gen

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Voltage regulation and power management are necessary to maintain balance of supply and demand in DC microgrids. In such systems, power sharing is normally done through parallel operation of distributed energy resources equipped with droop controllers. However, low power sharing accuracy and not allowing the microgrid to maximise the available power from the renewable sources are two main problems associated with conventional droop control methods. In addition, the 2D droop method is a parameter-dependent method for extracting maximum available energy from renewable sources. In this paper, a novel power management strategy based on the optimal 3D droop coefficients is developed for a DC microgrid. Optimal state estimation is attained using a combination of extended Kalman filter and adaptive recursive least square method. Reference currents of renewable energy sources (wind and solar) and battery energy storage system are estimated using the proposed prediction based model. The proposed strategy not only increases the power sharing accuracy but also remains the bus voltage around a nominal value. The performance of the proposed method is evaluated for the considered DC microgrid in two different scenarios. Results show the high effectiveness and robustness of the proposed method. It has been concluded that precise estimation of the sources reference currents and 3D droop coefficients are critical for optimal power management and bus voltage regulation in DC microgrids.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Hybrid Distributed and Decentralized Secondary Control Strategy to Attain Accurate Power Sharing and Improved Voltage Restoration in DC Microgrids

Cited by 35 publications

References 34 publications

Feedback control strategy for state‐of‐charge balancing and power sharing between distributed battery energy storage units in DC microgrid

Feedback control strategy for state‐of‐charge balancing and power sharing between distributed battery energy storage units in DC microgrid

Integrated Nonlinear Hierarchical Control and Management of Hybrid AC/DC Microgrids

A novel power management strategy based on combination of 3D droop control and EKF in DC microgrids

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