A Droop Frequency Control for Maintaining Different Frequency Qualities in a Stand-Alone Multimicrogrid System

Nguyen, Thai-Thanh; Yoo, Hyeong-Jun; Kim, Hak-Man

doi:10.1109/tste.2017.2749438

Cited by 38 publications

(25 citation statements)

References 35 publications

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“…The feasibility of DC interconnected MMGs is investigated in [19][20][21][22]. In the authors' previous work, the hybrid unit of common coupling (HUCC), which provides both AC and DC interfaces, is designed for MMGs in replacement of the conventional point of common coupling (PCC) [13].…”

Section: System Architecturementioning

confidence: 99%

A Multi-layer Coordinated Control Scheme to Improve the Operation Friendliness of Grid-Connected Multiple Microgrids

Huang

Tai

et al. 2019

Energies

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Multiple microgrids (MMGs) are clusters of interconnected microgrids that have great potential for integrating a large number of distributed renewable energies (DREs). The grid-connected control scheme is important for the exploration of the MMGs’ operation potential. In this paper, a multi-layer coordinated control scheme for DC interconnected MMGs is proposed to optimize their operation and improve their operation friendliness. An adaptive droop control method is designed for the DC connection interfaces of the MMGs to adaptively manage the power exchange among the sub-microgrids. Meanwhile, the strategy of power fluctuation suppression is developed for the hybrid energy storage system (HESS) in the MMGs. The coordination among the sub-microgrids and the HESS is then clarified by the proposed control scheme to optimize the AC tie-line power and make the MMGs a highly coordinated collective. A case study is performed in PSCAD/EMTDC based on the demonstration project in Guangxi, China. The results show that the proposed multi-layer coordinated control scheme realizes the coordinated operation of the MMGs, fully exploits the complementarity of the MMGs, and improves the operation friendliness among the sub-microgrids and the utility grid. Thus the integration and utilization of a large number of DREs is enhanced.

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Section: System Architecturementioning

confidence: 99%

A Multi-layer Coordinated Control Scheme to Improve the Operation Friendliness of Grid-Connected Multiple Microgrids

Huang

Tai

et al. 2019

Energies

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“…In [290], a hierarchical control method for dealing with the frequency issues of a multi-microgrid is presented. A framework for operating microgrids at various frequencies, in which each microgrid is connected to a common dc line through an interlinking inverter controlled using a droop frequency to reduce the number of interlinking converters, is demonstrated in [291]. It is also shown that the frequency control can be improved using the energy reserve of neighbouring microgrids which enable a high level of integration of RESs without the need for a large energy reserve.…”

Section: Challenges Of Microgridsmentioning

confidence: 99%

Evolution of Microgrids with Converter-Interfaced Generations: Challenges and Opportunities

Hossain¹,

Pota²,

Hossain³

et al. 2018

Preprint

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Although microgrids facilitate the increased penetration of distributed generations (DGs) and improve the security of power supplies, they have some issues that need to be better understood and addressed before realising the full potential of microgrids. This paper presents a comprehensive list of challenges and opportunities supported by a literature review on the evolution of converter-based microgrids. The discussion in this paper presented with a view to establishing microgrids as distinct from the existing distribution systems. This is accomplished by, firstly, describing the challenges and benefits of using DG units in a distribution network and then those of microgrid ones. Also, the definitions, classifications and characteristics of microgrids are revised according to their specific roles to provide a sound basis for novice researchers to undertake ongoing research on microgrids.

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“…33 There are several control methods used to adapt the system voltage and frequency values for islanded MGs. These control methods are divided into noncommunication-based control methods [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and communication control methods. [25][26][27][28][29] The first one includes droop control, peer-to-peer control, hierarchical control, PI/PID control, and sliding mode control.…”

Section: Introductionmentioning

confidence: 99%

“…It also has low cost and it does not need any communication between DG units. 9 However, this method requires a supplementary control to regulate the frequency and voltage of the system to their specified values. 15 The basic function of the H∞ controller is to provide control signals that take into consideration the effect of the disturbances on the controlled outputs.…”

Section: Introductionmentioning

confidence: 99%

A multistage H‐infinity–based controller for adjusting voltage and frequency and improving power quality in islanded microgrids

Sedhom

El‐Saadawi

Hatata

et al. 2019

Int Trans Electr Energ Syst

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Summary This paper proposes a novel methodology for controlling voltage and frequency of islanded microgrids and meanwhile improving the system power quality. The proposed methodology is based on applying a multi‐stage H‐Infinity (H∞) controller with different control loops to restore the nominal values of voltage and frequency after any load variation. These control loops include power control, current control, and voltage control loops. The H∞ is also applied with an LCL filter to enhance the system power quality. The proposed controller is applied to a test system under three different loading conditions and the obtained results are compared with that obtained by applying the model predictive control (MPC) method. The results are compared with that obtained by applying a proposed traditional control method in the same test system. A comparison between the droop controller and the proposed controller, MPC is performed based on fitness value, controller response time, and maximum frequency deviation. In addition, the system stability is analysed using root locus, system step response, singular value decomposition, and bode diagram. The results prove the effectiveness and the efficiency of the proposed method in restoring voltage and frequency and improving the system power quality.

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A Droop Frequency Control for Maintaining Different Frequency Qualities in a Stand-Alone Multimicrogrid System

Cited by 38 publications

References 35 publications

A Multi-layer Coordinated Control Scheme to Improve the Operation Friendliness of Grid-Connected Multiple Microgrids

A Multi-layer Coordinated Control Scheme to Improve the Operation Friendliness of Grid-Connected Multiple Microgrids

Evolution of Microgrids with Converter-Interfaced Generations: Challenges and Opportunities

A multistage H‐infinity–based controller for adjusting voltage and frequency and improving power quality in islanded microgrids

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