Research on Dynamic Process of DC Micro-grid under Hierarchical Control

Lee, Zheng; Zhu, Shouzhen; Zheng, Jinghong; Choi, Dae Hee; Wei, Lixiang

doi:10.3182/20140824-6-za-1003.00385

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…However, the usage of DC microgrids at distribution scale is increasing with the collaboration of various renewable resources due to the higher penetration of electric vehicles [5][6][7]. DC microgrids reduce the number of conversion units and also overcome the disadvantages of AC power, such as transformers inrush current, phase angle, frequency synchronization, reactive power, and power quality [3,8,9]. Although DC microgrids are emerging and inverter-based AC microgrids are the recent focus of research, many traditional AC loads appear in the system as DC loads when fed through inverter drive systems [8].…”

Section: Introductionmentioning

confidence: 99%

“…DC microgrids reduce the number of conversion units and also overcome the disadvantages of AC power, such as transformers inrush current, phase angle, frequency synchronization, reactive power, and power quality [3,8,9]. Although DC microgrids are emerging and inverter-based AC microgrids are the recent focus of research, many traditional AC loads appear in the system as DC loads when fed through inverter drive systems [8]. When studying the conventional control hierarchy for a legacy power system grid, a hierarchical control system is conventionally adopted for microgrids [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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A Control Methodology for Load Sharing System Restoration in Islanded DC Micro Grid with Faulty Communication Links

et al. 2018

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Abstract:Communication-based distributed secondary control is extensively used in DC microgrids. Compared to centralized control, it can provide better voltage regulation and load sharing in microgrids. A conventional secondary control technique that converges the system to a common operating point is improved by using the control methodology to detect the communication link failure and stabilize the system operation during communication islanding. Recently, more robust control schemes have been proposed to improve resilience, but communication islanding has not been addressed at the secondary level control for which the system requires additional tertiary control. However, link failure is a possibility in the microgrid, so this paper proposes a control scheme at the secondary level to detect communication islanding. Communication islanding may lead the system to unpredictable behavior, which may cause the system to become unstable and may further lead to a cascading failure. The proposed control scheme sustains the stability and operation of a DC microgrid. Voltage and current observer works in a parallel manner with the proposed secondary control to achieve a correction term for global operating points. The proposed control scheme has been verified through analysis and simulation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Control Methodology for Load Sharing System Restoration in Islanded DC Micro Grid with Faulty Communication Links

et al. 2018

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“…Secondary controls form the outer loop on top of the primary control. At the secondary level, all the nodes share the values with their neighbors to observe and converge the system to one common set point for the system to remain stable and balanced [14][15][16]. Secondary and tertiary controls are implemented in a centralized or decentralized fashion where they communicate with their neighbors through communication links.…”

mentioning

confidence: 99%

A Hierarchical Control Methodology for Renewable DC Microgrids Supporting a Variable Communication Network Health

Shahid

Khan

et al. 2018

Electronics

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The monitoring and control of renewable energy sources (RESs) based on DC (Direct Current) microgrids (DC MG) are gaining much consideration at this time. In comparison with the isolated individual control of converters in a microgrid, DC microgrids provide better voltage regulation and harmonized energy generation/consumption. To address the inherent vulnerability of communication links, robust methods have been proposed that improve the resilience of communication-based control. However, the failure of the communication links in microgrid control layers remains a considerable issue that may lead to one or more nodes being disconnected and operating as a communication island. Such types of communication islanding may cause the unpredictable behavior of the system and further destabilization may lead to a cascaded failure. This paper proposes a fast algorithm to detect and evaluate network connectivity based on the information stored at every node in the form of a look-up table. The control structure has been modified under communication islanding, and a communication connectivity observer is used at every node to detect and address power flow issues under communication islanding. The proposed method has been verified through mathematical analysis, simulation, and experimental results.

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Renewable energy source (RES) based islanded DC microgrid with enhanced resilient control

Shahid

Khan

Hashmi

et al. 2019

International Journal of Electrical Power & Energy Systems

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Research on Dynamic Process of DC Micro-grid under Hierarchical Control

Cited by 4 publications

References 8 publications

A Control Methodology for Load Sharing System Restoration in Islanded DC Micro Grid with Faulty Communication Links

A Control Methodology for Load Sharing System Restoration in Islanded DC Micro Grid with Faulty Communication Links

A Hierarchical Control Methodology for Renewable DC Microgrids Supporting a Variable Communication Network Health

Renewable energy source (RES) based islanded DC microgrid with enhanced resilient control

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