Linear Decentralized Power Sharing Schemes for Economic Operation of AC Microgrids

Nutkani, Inam Ullah; Loh, Poh Chiang; Wang, Peng; Blaabjerg, Frede

doi:10.1109/tie.2015.2472361

Cited by 55 publications

(33 citation statements)

References 26 publications

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“…where T and λ denote the incremental cost vector in economical regulator and its z transform, respectively. One can rewrite (15) and (16) in the z domain:…”

Section: The Global Dynamic Model and Parameter Designmentioning

confidence: 99%

“…Considering the fuel cost, maintenance cost, and emission penalties of DGs, a nonlinear cost-based droop scheme, where the incremental costs of DGs were embedded into, was developed to achieve a reduction in generation cost, and a linear cost-based droop scheme was proposed later to decrease the complexity of the nonlinear droop control in [14]. Further, the power limits of DGs were taken into account when developing the decentralized economic dispatch scheme in [15].…”

Section: Introductionmentioning

confidence: 99%

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Distributed Economic Dispatch Scheme for Droop-Based Autonomous DC Microgrid

Dou

et al. 2020

Energies

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In this paper, a distributed economic dispatch scheme considering power limit is proposed to minimize the total active power generation cost in a droop-based autonomous direct current (DC) microgrid. The economical dispatch of the microgrid is realized through a fully distributed hierarchical control. In the tertiary level, an incremental cost consensus-based algorithm embedded into the economical regulator is utilized to search for the optimal solution. In the secondary level, the voltage regulator estimating the average voltage of the DC microgrid is used to generate the voltage correction item and eliminate the power and voltage oscillation caused by the deviation between different items. Then, the droop controller in the primary level receives the reference values from the upper level to ensure the output power converging to the optimum while recovering the average voltage of the system. Further, the dynamic model is established and the optimal communication network topology minimizing the impact of time delay on the voltage estimation is given in this paper. Finally, a low-voltage DC microgrid simulation platform containing different types of distributed generators is built, and the effectiveness of the proposed scheme and the performance of the optimal topology are verified.

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“…where T and λ denote the incremental cost vector in economical regulator and its z transform, respectively. One can rewrite (15) and (16) in the z domain:…”

Section: The Global Dynamic Model and Parameter Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distributed Economic Dispatch Scheme for Droop-Based Autonomous DC Microgrid

Dou

et al. 2020

Energies

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show abstract

“…Considering the lower accuracy and increased complexity of the nonlinear droop control, a linear droop scheme was proposed to achieve a reduction in generation cost [38]. Later, the constraints such as online power reserve, frequency, voltage, and power limits were taken into consideration [39].…”

Section: Introductionmentioning

confidence: 99%

“…By embedding the generation costs into the droop control, the cost based droop schemes discussed in [18], [35]- [39] allowed autonomous identification of the appropriate DGs for generation, in terms of the generation cost. Therefore, compared to traditional droop control, the cost based droop schemes demonstrated significant effectiveness in the reduction of the total generation cost of the MG. On the other hand, the cost based droop control schemes were incapable of keeping the total generation cost to a minimum, because the power outputs of the DGs were tuned according to their respective generation costs rather than the total generation cost of the MG.…”

Section: Introductionmentioning

confidence: 99%

Cost-Based Droop Schemes for Economic Dispatch in Islanded Microgrids

Chen

et al. 2017

IEEE Trans. Smart Grid

132

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In this paper, cost based droop schemes are proposed, to minimize the total active power generation cost in an islanded microgrid (MG), while the simplicity and decentralized nature of the droop control are retained. In cost based droop schemes, the incremental costs of distributed generators (DGs) are embedded into the droop schemes, where the incremental cost is a derivative of the DG cost function with respect to output power. In the steady state, DGs share a single common frequency, and cost based droop schemes equate incremental costs of DGs, thus minimizing the total active power generation cost, in terms of the equal incremental cost principle. Finally, simulation results in an islanded MG with high penetration of intermittent renewable energy sources are presented, to demonstrate the effectiveness, as well as plug and play capability of the cost based droop schemes.Index Terms-Microgrid (MG), incremental cost, generation cost, cost based droop schemes, decentralized control.

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“…However, the power sharing cannot guarantee the economy of microgrid in most cases. In order to reduce the total active generation costs (TAGC) of microgrids via decentralized approach, Nutkani et al [7] presented the linear droop schemes by introducing maximum or mean generation costs to the droop coefficient, where the lower-cost DG holds higher priority of output power. Actually, the generation cost of DGs is a nonlinear function of active output power, thus the TAGC of microgrids might not be optimized efficiently.…”

Section: Introductionmentioning

confidence: 99%

Decentralized economical-sharing scheme for cascaded AC microgrids

Liu

et al. 2017

2017 IEEE Energy Conversion Congress and Exposition (ECCE)

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To address the economical dispatch problem without communications in islanded AC microgrids consisting of cascaded inverters, this paper proposes an optimal decentralized economicalsharing scheme. In proposed scheme, optimal sharing function of the current is applied to generate the reference voltages. And the frequency is used to drive all distributed generators (DGs) synchronize operation in microgrids. When the microgrid is in steady state, DGs share a single common frequency and current in terms of the proposed scheme. Thus the potential advantages of simplicity and decentralized manner are retained. The AC microgrid model has been developed through simulations and experiments to verify the effectiveness and performance of the proposed scheme.

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Linear Decentralized Power Sharing Schemes for Economic Operation of AC Microgrids

Cited by 55 publications

References 26 publications

Distributed Economic Dispatch Scheme for Droop-Based Autonomous DC Microgrid

Distributed Economic Dispatch Scheme for Droop-Based Autonomous DC Microgrid

Cost-Based Droop Schemes for Economic Dispatch in Islanded Microgrids

Decentralized economical-sharing scheme for cascaded AC microgrids

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