A Novel Decentralized Economic Operation in Islanded AC Microgrids

Han, Hua; Li, Lang; Wang, Lina; Su, Mei; Zhao, Yue; Guerrero, Josep M.

doi:10.3390/en10060804

Cited by 26 publications

(13 citation statements)

References 44 publications

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“…A PV‐storage MG with two storages (ESS#1 and ESS#2) and two PVs (PV#1 and PV#2) is built, which is shown in Figure . The simulation parameters are listed in Table , and the allowable frequency ranges are set in the interval [49 Hz, 51 Hz] …”

Section: Simulation Resultsmentioning

confidence: 99%

“…The simulation parameters are listed in Table 1, and the allowable frequency ranges are set in the interval [49 Hz, 51 Hz]. 20…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The parallel PV‐storage integrated MG shown in Figure A, as the earlier research, storage unit and PV inverter are integrated together to form an ideal DG. It is usually controlled by decentralized approaches based on droop concept . In these techniques, all the DGs are controlled as voltage sources to maintain the voltage/frequency regulation and power balance of system.…”

Section: Introductionmentioning

confidence: 99%

“…Then, these string FIGURE 2 Diagram of the proposed series-parallel PV-storage independent MG. MG, microgrid; PV, photovoltaic generation modules are parallel connected to form a higher voltage PV-storage MG without needs of step-up transformer. 12 In order to optimize storage allocation, realize centralized management and reduce the transmission line loss, [18][19][20][21] storage units are installed near the load side. 35,36 In other words, this system is composed of only one string centralized energy storage system (ESS), which is directly interfaced to the point of common coupling (PCC).…”

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A series-parallel PV-storage independent microgrid and its decentralized control

Liu

Yuan

et al. 2018

Int Trans Electr Energ Syst

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Summary This paper presents a series‐parallel photovoltaic (PV)‐storage independent microgrid (MG), where low‐voltage distributed generation units could be connected to power grid conveniently. Moreover, it provides a promising way to form medium voltage MG. For this proposed structure, a decentralized control is proposed. The PV units are controlled by a maximum power point tracking (MPPT)‐based droop control, where MPPT of the PV units is achieved. Storage units are regulated via a “droop” controller dependent its reactive power polarity and take the responsibility of keeping the power supply‐demand balance of the MG. Since all these controllers make decisions only based on their local information, the proposed control is reliable and cost‐effective. Moreover, the small‐signal stability of the system is proved. And simulation results are presented to verify the effectiveness.

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Section: Simulation Resultsmentioning

confidence: 99%

“…The simulation parameters are listed in Table 1, and the allowable frequency ranges are set in the interval [49 Hz, 51 Hz]. 20…”

Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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A series-parallel PV-storage independent microgrid and its decentralized control

Liu

Yuan

et al. 2018

Int Trans Electr Energ Syst

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“…Usually, they can be worked in two modes: grid-connected mode, and islanded mode. Usually, the main control objectives of a DC microgrid include maintaining stability [4][5][6][7][8][9], minimizing cost [10][11][12], sharing power and regulating voltage [13]. For these objectives, there are mainly three control methods: decentralized control [10,12,[14][15][16][17], distributed control [18][19][20][21][22][23][24][25][26] and centralized control [11,27].…”

Section: Introductionmentioning

confidence: 99%

Stabilization Method Considering Disturbance Mitigation for DC Microgrids with Constant Power Loads

Liang

Liu

2019

Energies

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In this paper, the stability of direct current (DC) microgrids with a constant power load (CPL) and a non-ideal source is investigated. The CPL’s negative impedance will destabilize the system, and disturbances in the non-ideal source will degrade the load voltage quality. In this study, we aim to: (1) overcome the instability of the CPL; (2) mitigate disturbances from the non-ideal source; (3) prevent the discontinuous harmonic current of high-frequency switching regulator from interfering with the source. Then, a stabilization method based on active damping which can achieve the above three objectives simultaneously is proposed. To obtain the stability conditions, the small-signal model of the system near the high-voltage equilibrium is established. Then, stability conditions are derived by eigenvalue analysis, and the domain of attraction near equilibrium is also obtained using the quadratic Lyapunov function. For the second objective, the key is to choose the optimal parameters to achieve disturbance attenuation. For the third objective, the active damper can separate the source from the switching regulator, which can prevent the discontinuous harmonic current. Moreover, the proposed method can be extended to multiple cases, and simulation results verify the effectiveness of the proposed method.

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Leader‐distributed follower‐decentralized control strategy for economic dispatch in cascaded‐parallel microgrids

Han

Xia

Sun

et al. 2021

Int Trans Electr Energ Syst

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In this paper, we propose a leader-distributed follower-decentralized (LDFD) control strategy for cascaded-parallel microgrids (CPMGs) in the islanded mode, under which the economic dispatch (ED) is achieved with voltage quality guaranteed and frequency synchronization. In this control strategy, a distributed control method is presented for the leader of distributed generators (DGs) and an improved droop control method is designed for other DGs (followers) to optimize the generation cost and frequency control of the system. Furthermore, a unified voltage regulator is proposed to make the power factor of each DG in the same string equal. As only the leader in each string communicates with its neighboring leaders with low data transfer rate, very sparse low bandwidth communication networks are needed in this scheme, which reduces costs and increases the reliability in the event of a communication failure. In addition, the small-signal stability of the system is analyzed and the design of the related parameters is given. Some cases are designed to evaluate the performance of the strategy, and the simulation results verify the effectiveness of the proposed method. K E Y W O R D Scascaded-parallel microgrid, distributed control, economic dispatch, low bandwidth communication. | INTRODUCTIONMICROGRID is an effective way of integrating distributed generators (DGs), energy storage units via inverters, and local loads to achieve active distribution networks, 1 which can reduce the impact of large penetration of intermittent renewable energy integrated into the electrical grid, making the power system more reliable, safe, clean, and economical. In recent years, the growing penetration of DGs based on power electronic converters has brought structural changes 2 to microgrids to accommodate a wider range of applications. Combining the ideas of parallel-type 3 and series-List of abbreviations and symbols: LDFD, leader-distributed follower-decentralized; CPMG, cascaded-parallel microgrid; ED, economic dispatch; DG, distributed generator; EDP, economical dispatch problem; PCC, point of common coupling; ICR, incremental cost rate; DG#i.j, the j-th DG in String#i; V P , voltage amplitude of the common bus; δ p , power angle of the common bus; Y 0 L, amplitude of equivalent load admittance; φ L , angle of equivalent load admittance; V i.j , voltage amplitude of DG#i.j; δ i.j , phase angle of DG#i.j; λ i.j , incremental cost rate of DG#i.j; P i.j , output active power of DG#i.j; V G , set of nodes; A G , associated adjacency matrix; D in G , diagonal in-degree matrix; ω * , rated angular frequency; V * , rated voltage amplitude of common bus; Q i.j , output reactive power of DG#i.j; λ i:1 , estimate of the average ICR among leaders;P i:j , estimate of total active power of DGs in String#i; I l , identity matrix; H, ICR estimator transfer function matrix; A, system matrix.

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A Novel Decentralized Economic Operation in Islanded AC Microgrids

Cited by 26 publications

References 44 publications

A series-parallel PV-storage independent microgrid and its decentralized control

A series-parallel PV-storage independent microgrid and its decentralized control

Stabilization Method Considering Disturbance Mitigation for DC Microgrids with Constant Power Loads

Leader‐distributed follower‐decentralized control strategy for economic dispatch in cascaded‐parallel microgrids

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