An Enhanced Droop Control Method for Accurate Load Sharing and Voltage Improvement of Isolated and Interconnected DC Microgrids

Tah, Avisha; Das, Debapriya

doi:10.1109/tste.2016.2535264

Cited by 159 publications

(111 citation statements)

References 28 publications

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“…References [5,12,28,29] and [23] have reported the interconnection of DC MG clusters. Hierarchical control has been proposed in [28,29] and [23] to regulate the DC bus voltage and adaptive droop based upon the SOC information improves the efficiency of parallel connected batteries in each MGs.…”

Section: Interconnection Of DC Mgs Through Tie-linementioning

confidence: 99%

“…However, the intermittent nature of renewable sources like solar PV and wind bring instability issues in MGs and degrades the power quality. Forming an autonomous MG by organizing renewable DGs and ESS can mitigate such power intermittency, thus, enhancing the power quality and making the power supply more efficient [11,12]. Moreover, the absence of frequency, phase and reactive power control in its operation make DC MG advantageous over traditional AC system.…”

Section: Introductionmentioning

confidence: 99%

“…The objectives of DC MG operation are to control the parallel converters involved to interface DG units, and to achieve CrossCheck date: 14 June 2017 proportional load sharing and voltage regulation [12]. Control strategies of DC MG are categorized as centralized, decentralized and distributed depending upon the communication link utilized and are discussed in [13][14][15][16] to address the above mentioned control objectives for smooth DC MG operation.…”

Section: Introductionmentioning

confidence: 99%

“…The master slave control and hierarchical secondary control [12,17] require high bandwidth communication and is only effective when the loads and sources are closely connected. Implementation of power sharing in a droop controlled DC MG is achieved by reducing the voltage reference with an increase in output current [17].…”

Section: Introductionmentioning

confidence: 99%

“…This decentralized control approach without high bandwidth communication compared to master slave control is suitable for DC MG [18]. However, it has the disadvantage of output current sharing accuracy resulted by voltage drop across line impedance [12]. Another disadvantage of droop control is voltage deviation, resulted by the reduction of DC output voltage [19].…”

Section: Introductionmentioning

confidence: 99%

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Decentralized control of two DC microgrids interconnected with tie-line

Adhikari

Tang

et al. 2017

J. Mod. Power Syst. Clean Energy

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This paper examines the interconnection of two DC microgrids (MGs) with tie-line. The voltages at respective MG buses are controlled to manage the power flow across the tie-line. Formation of such a DC MG cluster ensures higher reliability of power supply and flexibility to manage distributed energy resources and loads in the system. Two MGs consist of photovoltaic and battery units interfaced by power electronic converters. The bus voltages of two DC MGs act as an indicator for the power flow monitoring the supply-demand balance. A decentralized control approach is proposed to control each MG and bus voltage fluctuation in an allowable range. Furthermore, a mode adaptive decentralized control approach is proposed for seamless mode transition in order to assign microgrid operation modes and for the power management of DC MGs. The effectiveness of the proposed concept is validated by simulation and experimental results.

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Section: Interconnection Of DC Mgs Through Tie-linementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Decentralized control of two DC microgrids interconnected with tie-line

Adhikari

Tang

et al. 2017

J. Mod. Power Syst. Clean Energy

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An accurate current sharing method for an Islandeddroop‐controlled dcmicrogrid without communication between remote buses

Maulik

Das

2020

Int Trans Electr Energ Syst

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Summary The traditional droop control method in a DC microgrid (DCMG) fails to achieve accurate current sharing among parallel‐connected dispatchable units when the connecting feeders have unequal resistances, or when the units supply local loads apart from loads at the common dc bus. In this paper, a novel modification of the droop control strategy (additional feedback term in the outer control loop) is suggested to overcome the above limitations. The proposed method is robust, noise‐resilient, amenable to the “plug and play model”, and employs local measurements, thereby, dispensing with the need for communication between remote nodes. A small‐signal model of the system with the proposed control strategy is derived for carrying out eigenvalue and participation factor analysis. A sensitivity analysis is also carried out to inspect the impact of variation of system parameters on small‐signal stability. The effect of time delay and noise on system small‐signal stability is also studied. A robust stability analysis is also carried out. The proposed control strategy is easily implementable on digital hardware. Time domain simulations using PSCAD (Power System Computer Aided Design)/EMTDC(Electromagnetic Transients including DC) is carried out to validate and compare the performance of the proposed technique vis‐a‐vis other existing methods. Performance of the proposed method is good even with time delay and noise.

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