Analysis of Consensus-Based Islanded Microgrids Subject to Unexpected Electrical and Communication Partitions

Rosero, Carlos; Velasco, Manel; Martí, Pau; Camacho, Antonio; Miret, Jaume; Castilla, Miguel

doi:10.1109/tsg.2018.2877218

Cited by 16 publications

(6 citation statements)

References 38 publications

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“…This paper complements [10] by considering failures that leads to disconnected electrical/communication sub-graphs, named partitions, that co-exist within the MG. A closed-loop model integrating the two graph Laplacian matrices is built and analyzed using the zero eigenvalue analysis. This technique has been also used in the stability analysis of power systems of critical lines [13] and in the stability analysis for partitioned MGs controlled by consensus-based secondary control [14]. However, its application to the performance analysis of the droop-free control has not been reported.…”

Section: Introductionmentioning

confidence: 99%

Active Power Sharing and Frequency Regulation in Droop-Free Control for Islanded Microgrids Under Electrical and Communication Failures

Rosero

Velasco

Martí

et al. 2020

IEEE Trans. Ind. Electron.

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The droop-free control for AC microgrids achieves active power sharing and frequency regulation by replacing the centralized secondary control and the primary-level droop mechanism by a cooperative distributed control strategy. This paper analyses the performance of the droop-free control when an islanded microgrid suffers electrical and communication failures. The microgrid is modeled by two connected graphs corresponding to the electrical and communication networks. The considered failures leads to partitioned electrical/communication subgraphs that co-exist within the microgrid. A closed-loop model integrating the power flow equations, the droop-free control, and the electrical and communication graphs is derived. The stability analysis identifies critical partitions where the microgrid is driven to the instability, and the steady-state analysis characterizes the equilibrium points when the partitioned microgrid remains stable. The paper also provides a control strategy that is able to avoid the instability scenario. Selected experimental results on a low-scale laboratory microgrid illustrate the impact that failures have in system performance and the ability of the proposed control for confining the microgrid operation into a safe region.

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Section: Introductionmentioning

confidence: 99%

Active Power Sharing and Frequency Regulation in Droop-Free Control for Islanded Microgrids Under Electrical and Communication Failures

Rosero

Velasco

Martí

et al. 2020

IEEE Trans. Ind. Electron.

Self Cite

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“…To the best of our knowledge, the consequences of unexpected MG partitions were studied for the first time by Rosero et al in [15]. More specifically, in Fig.…”

Section: B Review Of Sophisticated Secondary Controllersmentioning

confidence: 99%

Robust Secondary Controller for Islanded Microgrids with Unexpected Electrical Partitions Under Fault Conditions

Pompodakis,

Orfanoudakis,

Yiannis

et al. 2024

Preprint

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This paper presents a sophisticated centralized secondary controller tailored for inverter-based, islanded Microgrids (MGs) that are prone to unforeseen network partitions triggered by faults activating protective devices. In typical radialconfigured MGs, a line fault can cause protective devices to isolate the faulted line, thereby splitting the MG into two electrically independent sub-microgrids (SMGs), while retaining the existing communication and control framework. Diverging from both centralized and distributed traditional secondary controllers, which often fail to normalize the frequency in one of the split SMGs, the proposed controller exhibits exceptional performance. Through simulation studies on 6-bus and 13-bus islanded MG setups, our controller has demonstrated not only its ability to swiftly restore nominal frequency in both SMGs within a few seconds, but also to ensure fair power distribution among the distributed generators (DGs) serving the SMGs. This rapid frequency stabilization underscores the controller's effectiveness in maintaining stable frequency levels immediately following a fault.

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“…In [63], a sliding-mode observer is adopted to estimate the control delay of a microgrid inverter, and the time delay is compensated for accordingly. In [64], the impact of microgrids with consensus algorithms under a communication failure is investigated.…”

Section: Secondary Regulation Problem Under Disturbances Harmonics An...mentioning

confidence: 99%

Secondary-Frequency and Voltage-Regulation Control of Multi-Parallel Inverter Microgrid System

Dong

Gong²,

Bao³

et al. 2022

Energies

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As an important form of distributed renewable energy utilization and consumption, the multi-parallel inverter microgrid system works in both an isolated and grid-connected operation mode. Secondary-frequency and voltage-regulation control are very important in solving problems that appears in these systems, such as the distributed secondary-frequency regulation real-time scheme, voltage and reactive power balancing, and the secondary-frequency regulation control under the disturbances and unbalanced conditions of a microgrid system. This paper introduces key technologies related to these issues, such as the consensus algorithm and event-triggered technique, the dynamic and adaptive virtual impedance technique, and the robust and self-anti-disturbance control technique. Research and design methods such as small-signal state-space analysis, the Lyapunov function design method, the impedance analysis method, μ-synthesis design, and the LMI matrix design method are adopted to solve the issues in secondary-frequency regulation and voltage regulation. As the number of inverters increases, the structure of the microgrid becomes more and more complex. Suggestions and prospects for future research are provided to realize control with low-communication technology and a distributed scheme. Finally, for the case study, the droop-control model and primary frequency/voltage deviation of a multi-parallel inverter microgrid system is analyzed, and a state-space model of a multi-parallel inverter microgrid system with a droop-control loop is established. Then, the quantitative relationship between the primary frequency/voltage deviation and the active and reactive power output in the system is discussed. The methods and problems of centralized and decentralized secondary-frequency regulation methods, secondary-frequency regulation methods based on a consensus algorithm and an event-triggered mechanism, reactive power and voltage equalization, power distribution, and small-signal stability of the multiple parallel inverter microgrid system regarding the virtual impedance loop are analyzed.

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Analysis of Consensus-Based Islanded Microgrids Subject to Unexpected Electrical and Communication Partitions

Cited by 16 publications

References 38 publications

Active Power Sharing and Frequency Regulation in Droop-Free Control for Islanded Microgrids Under Electrical and Communication Failures

Active Power Sharing and Frequency Regulation in Droop-Free Control for Islanded Microgrids Under Electrical and Communication Failures

Robust Secondary Controller for Islanded Microgrids with Unexpected Electrical Partitions Under Fault Conditions

Secondary-Frequency and Voltage-Regulation Control of Multi-Parallel Inverter Microgrid System

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