Adaptive Droop Control Method for Suppressing Circulating Currents in DC Microgrids

Ghanbari, Niloofar; Bhattacharya, Subhashish

doi:10.1109/oajpe.2020.2974940

Cited by 56 publications

(31 citation statements)

References 26 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.…”

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

confidence: 99%

“…The circulating currents exist between the DGs mainly due to mismatch output characteristics, and it results in poor performance of the converters. Niloofar Ghanbari et al [49] presented a secondary controller with the adaptive droop control to suppress the circulating current and line parameters effect, and their presented results show accurate current sharing among the converters with the reduced circulating current. The virtual frequency-based droop control provides excellent performance, but it involves a low bandwidth communication channel and makes the system fault ride through [50].…”

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

confidence: 99%

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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%

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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“…The operation of different types of DG to meet the load needs a parallel operation but causes improper load sharing between converters and circulating current due to the abrupt variations in the source, sudden changes in load, and parametric differences due to various constraints [14]. Studies in the literature have discussed the most popular techniques of load sharing such as active current sharing [15][16][17] and droop control [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. The most familiar one is the master/slave technique, where, in the master/slave current method, a common bus is employed between DC converters for proper current sharing [15] and the generation of the required base voltage.…”

Section: Introductionmentioning

confidence: 99%

“…A new strategy for current control to minimize the circulating current with a combination of average voltage and the proportional current sharing controller was proposed, considering fixed droop resistance [27]. In [28], an adaptive droop control method was proposed to suppress circulating currents in a low-voltage DC microgrid. Line resistances were estimated through mathematical calculation and droop parameters were adjusted accordingly.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Adaptive Droop Control Applied to Low-Voltage DC Microgrid

2021

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In a DC microgrid, droop control is the most common and widely used strategy for managing the power flow from sources to loads. Conventional droop control has some limitations such as poor voltage regulation and improper load sharing between converters during unequal source voltages, different cable resistances, and load variations. This paper addressed the limitations of conventional droop control by proposing a simple adaptive droop control technique. The proposed adaptive droop control method was designed based on mathematical calculations, adjusting the droop parameters accordingly. The primary objective of the proposed adaptive droop controller was to improve the performance of the low-voltage DC microgrid by maintaining proper load sharing, reduced circulating current, and better voltage regulation. The effectiveness of the proposed methodology was verified by conducting simulation and experimental studies.

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“…Research on microgrid stability is categorized into small‐signal stability, transient stability, and voltage stability [13]. A control scheme combining droop control and PI feedback control, [14–16], is validated with good performance in regulation, power dispatch, and transient stability.…”

Section: Introductionmentioning

confidence: 99%

Critical values of cyber parameters in a dynamic microgrid system

Lee

Liu

Wang

et al. 2021

IET Generation Trans & Dist

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An islanded microgrid is cyber-physical system, and the control relies on the communication system significantly. Improper parameters of the cyber system can result in instability of a microgrid system. To evaluate the impact of a networked control system on control performance, a cyber model is developed to represent data acquisition periods and communication delays. Simplification of the networked control system model is proposed to enhance the computational performance, making the analytical method applicable for large-scale systems. Based on the analysis, a two-dimensional stability region of a microgrid in the space of cyber parameters can be obtained. To validate the proposed method, a microgrid control scheme is proposed for power dispatch and regulation based on the droop and proportional-integral (PI) feedback control. The analytical method is compared to the time-domain simulation, and it is shown that the stability regions are nearly identical. The critical values of cyber parameters are determined based on the analytical results. The proposed control strategy with the given cyber parameters is validated for transient stability following dynamic events. Simulation results indicate that the design of a microgrid as a cyber-physical system needs to be guided by critical values for cyber parameters to prevent system instability.

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Adaptive Droop Control Method for Suppressing Circulating Currents in DC Microgrids

Cited by 56 publications

References 26 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

Investigation of Adaptive Droop Control Applied to Low-Voltage DC Microgrid

Critical values of cyber parameters in a dynamic microgrid system

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