Improved Mode-Adaptive Droop Control Strategy for the DC Microgrid

Mohammadi, Jafar; Ajaei, Firouz Badrkhani

doi:10.1109/access.2019.2924994

Cited by 32 publications

(20 citation statements)

References 49 publications

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“…The recent research studies on adaptive droop control, proving versatile [47][48][49]. The adaptive droop control presented in the literature [47] enhanced the current sharing among the ESS units; further, the abstract [48] shown mode adaptive droop control, which improves load-current sharing with proper voltage regulation and decreases the circulating currents among the DGs. The circulating currents exist between the DGs mainly due to mismatch output characteristics, and it results in poor performance of the converters.…”

Section: Figure 7 Illustration Of Virtual Impedance-based Droop Controlmentioning

confidence: 99%

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

Ansari¹,

Chandel²,

Tariq

2021

IEEE Access

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Owing to the smart lifestyle, environmental consciousness, and dwindling fossil fuel supplies, there is a huge demand for clean and green energy. Microgrid (MG) is a crucial approach to renewable and clean energy. Because of the success of the AC utility grid and the growing demand for critical loads, it is very convenient to provide AC/DC MG that can easily satisfy both the alternating current (AC) MG and the direct current (DC) MG requirements. Due to uncertainty in load variations, main grid failures, intermittent power generations from renewable energy sources (RESs), the synchronization and interconnection of different power converters are the paramount issues in the control of AC/DC MG. This paper presents an overview-oriented state of the art in the recent advancement in control strategies of AC/DC MG and its associated power converters control. Based on recent research, this paper summarizes unobstructed views on different topologies, types of power converters, power converter controls, and control strategies of AC/DC MG. Finally, it identified some future challenges that need to be addressed in order to develop a sustainable and reliable control strategy for AC/DC MG. This paper will serve as a guide for researchers. INDEX TERMS Distributed generation, Microgrids, AC/DC Microgrid, Centralized control, Decentralized control I. INTRODUCTION MGs compromise different RESs, i.e., PV cells, windmills, energy-storing systems (ESS), diesel generator sets, and small hydropower plants, as discussed in the [1,2]. With the advancements in power semiconductor devices, the integration of RESs with leading utility or MG becomes so more accessible. Based on the adopted topology, there are three types of MGs, classified as DC MG, AC MG, and AC/DC MG or hybrid MG [3]. The DC MGs are preferred to supply critical loads like computers, operation theatres, and billing counters. Whereas the AC MGs are preferred in supplying all loads during off-grid or on-grid. The AC/DC MG possesses the characteristics of both DC MG and AC MG. Since begin, in these types of MGs, the power converters are connected in parallel with the MG bus-bar and belong to the parallel topology of MG. Recently a seriescascaded MG topology is being investigated. Inam Ullah Nutkani and et al. in [4] has presented a series-cascaded AC MG topology to integrate the non-dispatchable RESs to the MG and offered its advantages and disadvantages over the parallel topology. Fig.1 shows the different topological advances of MGs.

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Section: Figure 7 Illustration Of Virtual Impedance-based Droop Controlmentioning

confidence: 99%

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

Ansari¹,

Chandel²,

Tariq

2021

IEEE Access

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“…In improved mode adaptive droop control, above‐mentioned drawback of mode adaptive droop control is corrected. In addition, it effectively reduces the circulating currents between DERs 45 …”

Section: Control Strategies For Dersmentioning

confidence: 99%

A review on control strategies for microgrids with distributed energy resources, energy storage systems, and electric vehicles

Nikam¹,

Kalkhambkar²

2020

Int Trans Electr Energ Syst

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“…The study system shown in Fig. 4 [11], [12], [29] represents the IEEE 37-node AC test feeder [31] which is converted to a ±750 V DC microgrid. It contains two photovoltaic (PV) generation systems, a wind turbine (WT), and two battery energy storage systems (BESSs).…”

Section: A Study Systemmentioning

confidence: 99%

“…Detailed switching models are utilized to represent the DC/AC and Table I provides the major parameters of the DC microgrid. A more detailed description, including the parameters of the individual loads, lines, and the converter controllers, is provided in [11], [12], [29]. The shaded areas in Fig.…”

Section: A Study Systemmentioning

confidence: 99%

“…The DC microgrid control challenges have been investigated and mostly addressed in the literature [7]- [12]. However, the conventional control actions, e.g., adjusting the DER power outputs, may not be adequate to prevent sustained under-voltage conditions and cascading outages caused by a significant power deficit, especially in an islanded DC microgrid.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive Time Delay Strategy for Reliable Load Shedding in the Direct-Current Microgrid

Mohammadi

Ajaei

2020

IEEE Access

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This paper proposes a practical and reliable decentralized load shedding strategy to protect the integrity of the direct-current (DC) microgrid. The proposed strategy utilizes time delays that automatically adapt to the DC microgrid operating conditions through continuous evaluation of the bus voltage variations, without depending on remote communication. It is evaluated in comparison with the conventional timer-based load shedding strategy. The studies are performed in the PSCAD software environment, on a detailed model of a DC microgrid that contains various types of loads and distributed energy resources. The results of the investigations show that the proposed adaptive time delay strategy (i) effectively restores the balance between the power demand and supply in the DC microgrid by quickly shedding the necessary amount of loads, (ii) is able to prioritize the non-critical loads by coordinating the load shedding steps based on a predetermined order, (iii) prevents the steady-state values of the DC microgrid voltages from falling below a predetermined lower limit, (iv) significantly limits the voltage sags caused by power deficit in the microgrid, (v) is highly expandable and is able to coordinate a large number of load shedding steps, and (vi) improves the reliability of the electrical power provided to the DC microgrid loads, by avoiding inessential load shedding. INDEX TERMS Adaptive load shedding, integrity protection, direct-current microgrid, power deficit.

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Improved Mode-Adaptive Droop Control Strategy for the DC Microgrid

Cited by 32 publications

References 49 publications

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

A Comprehensive Review on Power Converters Control and Control Strategies of AC/DC Microgrid

A review on control strategies for microgrids with distributed energy resources, energy storage systems, and electric vehicles

Adaptive Time Delay Strategy for Reliable Load Shedding in the Direct-Current Microgrid

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