Distributed Hierarchical Control of AC Microgrid Operating in Grid-Connected, Islanded and Their Transition Modes

Hou, Xiaochao; Sun, Yao; Lu, Jinghang; Zhang, Xin; Koh, Leong Hai; Su, Mei; Guerrero, Josep M.

doi:10.1109/access.2018.2882678

Cited by 117 publications

(72 citation statements)

References 34 publications

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“…The degree of this dependence varies with the kind of load. A general model for linear loads can be obtained from (3).…”

Section: Element Modelling For Power Flow Algorithmmentioning

confidence: 99%

“…These days, it is generally accepted that microgrids are a key structure to integrate Distributed Generation (DG) and energy storage into the smart grids [1][2][3][4]. Hierarchical control for microgrids constitutes a trade-off between the accuracy of centralized control techniques and the flexibility and resilience that are presented by the distributed control ones [2].…”

Section: Introductionmentioning

confidence: 99%

“…Hierarchical control for microgrids constitutes a trade-off between the accuracy of centralized control techniques and the flexibility and resilience that are presented by the distributed control ones [2]. Under this control scheme, primary control assures power balance within the microgrid, when it is islanded, usually by means of well-known droop rules, at the cost of frequency and voltage deviations; secondary control is responsible for restoring frequency and voltage to reference values and tertiary control (sometimes only present in grid-connected situation) performs economic optimization, according to energy price, energy efficiency targets, or agreements between stakeholders [3].…”

Section: Introductionmentioning

confidence: 99%

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Secondary Control for Storage Power Converters in Isolated Nanogrids to Allow Peer-to-Peer Power Sharing

et al. 2020

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It is usual in literature that power sharing among grid-forming sources of an isolated microgrid obeys their energy rating, instead of economic agreements between stakeholders, and circulating energy among them is usually avoided. However, these energy interchanges make strong sense and classical power sharing methods must be reformulated in the context of prosumer-based microgrids. This paper proposes a secondary control method for a prosumer-based low-voltage nanogrid that allows for energy interchange between prosumers, where storage systems, together with PV generators, are the controllable grid-forming sources. A power flow technique adapted to islanded microgrids is used for secondary control algorithm and the whole hierarchical control strategy for the prosumer converter is simulated and validated. This hierarchical control consists of three stages: tertiary control plans the energy interchange among prosumers, secondary obtains different voltage and power setpoints for each of the grid-forming sources, and, finally, primary control guarantees stable voltage and frequency values within the nanogrid with droop rules. Inner control loops for the power converter are also defined to track setpoints and assure stable performance. Simulation tests are carried out, which prove the stability of the proposed methods and the accuracy of the setpoint tracking.

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“…The degree of this dependence varies with the kind of load. A general model for linear loads can be obtained from (3).…”

Section: Element Modelling For Power Flow Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Secondary Control for Storage Power Converters in Isolated Nanogrids to Allow Peer-to-Peer Power Sharing

et al. 2020

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“…The droop control method was applied for microgrids in grid-connected mode. [13][14][15][16] Note that the key to the success of droop control lies in that there is no dominating frequency or voltage magnitude in the system when the droop characteristics are applied for power sharing. However, for grid-connected mode, the frequency and voltage magnitude of the microgrid at the point of common coupling are clamped by the stiff main grid.…”

Section: Introductionmentioning

confidence: 99%

A unified distributed robust control framework for power sharing of grid‐connected dispatchable distributed generator cluster

Su¹,

Tu²,

Cai

2020

Adv Control Appl

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Summary In this paper, a unified distributed robust control framework is proposed to address the power sharing problem for a cluster of dispatchable distributed generators (DDGs) within a grid‐connected AC microgrid. In contrast to the existing results, the advantages of the proposed control design are threefold. First, the unified design can directly handle the dynamics of the closed‐loop system by Lyapunov analysis without the assumption on time scale separation. Second, the canonical internal model is adopted so that the controller is able to undertake arbitrarily large parametric uncertainties. Last not least, the associated control gains can be obtained once and for all following the standard procedure. Comprehensive numerical simulations are provided for performance validation.

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“…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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Distributed Hierarchical Control of AC Microgrid Operating in Grid-Connected, Islanded and Their Transition Modes

Cited by 117 publications

References 34 publications

Secondary Control for Storage Power Converters in Isolated Nanogrids to Allow Peer-to-Peer Power Sharing

Secondary Control for Storage Power Converters in Isolated Nanogrids to Allow Peer-to-Peer Power Sharing

A unified distributed robust control framework for power sharing of grid‐connected dispatchable distributed generator cluster

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

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