Distributed Averaging Control for Voltage Regulation and Current Sharing in DC Microgrids

Trip, Sebastian; Cucuzzella, Michele; Cheng, Xiaodong; Scherpen, Jacquelien M. A.

doi:10.1109/lcsys.2018.2857559

Cited by 115 publications

(127 citation statements)

References 21 publications

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“…However, if scenarios are more complex, such as including dynamic (inductive) lines and loads are considered, the primary control need to be further improved. Therefore, the real-time implementation of nonlinear control strategies needs to be further explored [70]. The advantages and disadvantages of primary control and voltage compensation methods in dc microgrids are summarized in Table 1.…”

Section: Current Sharing Strategies Based On Nonlinear Droop Controlmentioning

confidence: 99%

Review of Power Sharing, Voltage Restoration and Stabilization Techniques in Hierarchical Controlled DC Microgrids

et al. 2019

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In order to overcome the problem of power generation in distributed energy, microgrid(MG) emerges as an alternative scheme. Compared with the ac microgrids, the dc microgrids have the advantages of high system efficiency, good power quality, low cost, and simple control. However, due to the complexity of the distributed generation system, the conventional droop control shows the drawbacks of low current sharing accuracy. Therefore, the improved primary control methods to enhance current sharing accuracy are systematically reviewed, such as particle swarm optimization programming, probabilistic algorithm and voltage correction factor scheme. However, it is difficult to achieve stable and coordinated operation of the dc microgrids by relying on the primary control. Hence, the various secondary control approaches, such as dynamic current sharing scheme, muti-agent system (MAS) control and virtual voltage control methods have been summarized for voltage regulation. Furthermore, the energy management system (EMS), modular-based energy router (MBER) and other coordinated control methods are reviewed to achieve power management. Besides, various control methods to compensate the effect of communication delay are summarized. Moreover, linear matrix inequality (LMI), Lyapunov-Krasovskii functional stability and Takagi-Sugeno model prediction scheme can be adopted to eliminate the influence of communication delay. In addition, due to the constant power loads (CPL) exhibit negative impedance characteristics, which may result in the output oscillation of filter. Thus, various control approaches have been reviewed to match the impedance, such as the nonlinear disturbance observer (NDO) feedforward compensation method, linear programming algorithm, hybrid potential theory and linear system analysis of polyhedral uncertainty. The merits and drawbacks of those control strategies are compared in this paper. Finally, the future research trends of hierarchical control and stability in dc microgrids and dc microgrid clusters are also presented. INDEX TERMS DC microgrid, nonlinear droop control, multi-agent system, consensus control, communication delay, constant power load, hierarchical control.

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Section: Current Sharing Strategies Based On Nonlinear Droop Controlmentioning

confidence: 99%

Review of Power Sharing, Voltage Restoration and Stabilization Techniques in Hierarchical Controlled DC Microgrids

et al. 2019

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“…In this chapter, we mainly focus on an important class of networks, namely, consensus networks, where subsystems are interconnected via diffusive couplings. Various applications, including formation control of mobile vehicles, synchronization in power networks, and balancing in chemical kinetics, involve the concept of consensus networks [66,50,35,33,53,72,75].…”

Section: Network Systemsmentioning

confidence: 99%

11 Reduced-order modeling of large-scale network systems

2020

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“…The off-time interval of the active switches is defined by t 2 and expressed by (6). The equivalent electrical circuit during t 2 is shown in Fig.…”

Section: A Operating Stagesmentioning

confidence: 99%

“…Such energy conversion systems can be connected to the ac grid through dc-ac power converters using an ac bus [3]- [5]. However, interconnection through a dc bus is also possible [6].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Validation of a Single-Phase Series Active Power Filter for Harmonic Voltage Reduction

et al. 2019

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Research advances on renewable energy systems have increased the interest in the use of isolated power supplies composed of power converters based on high-frequency transformers. Such power equipment generally presents high internal impedance, which amplifies the effects of harmonic voltages produced by nonlinear loads that draw currents with high harmonic content. Some sensitive loads, e.g., electric motors and distribution transformers, may not properly operate when supplied by extremely distorted voltages. Series active power filters (SAPFs) are suitable to mitigate this inconvenient, being capable of providing harmonic voltage compensation and minimizing the distortion of supply voltages. In this context, this work addresses the small-signal modeling, control system implementation, and experimental validation of a single-phase SAPF. The proposed approach is solely employed for harmonic voltage compensation purposes, thus allowing loads to be supplied by a nearly sinusoidal voltage. During the modeling process, the operating steps are analyzed in detail, while the presence of parasitic elements is taken into account. An equivalent circuit is also derived, which is used to provide an easy understanding of the interactions among the SAPF, load, and power supply. From this model, transfer functions can be obtained so that it is possible to design the control loops used by the SAPF. Experimental results with distinct types of loads are presented to evaluate the SAPF performance in both steady-state and transient conditions. INDEX TERMS Harmonic voltage filtering, voltage quality, series active power filter, small-signal modeling, voltage-source inverter.

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Distributed Averaging Control for Voltage Regulation and Current Sharing in DC Microgrids

Cited by 115 publications

References 21 publications

Review of Power Sharing, Voltage Restoration and Stabilization Techniques in Hierarchical Controlled DC Microgrids

Review of Power Sharing, Voltage Restoration and Stabilization Techniques in Hierarchical Controlled DC Microgrids

11 Reduced-order modeling of large-scale network systems

Modeling and Experimental Validation of a Single-Phase Series Active Power Filter for Harmonic Voltage Reduction

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