Plug-and-play control of AC islanded microgrids with general topology

Tucci, Michele; Floriduz, Alessandro; Riverso, Stefano; Ferrari-Trecate, Giancarlo

doi:10.1109/ecc.2016.7810501

Cited by 21 publications

(14 citation statements)

References 16 publications

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“…It was concluded from the results that for enhancement of transients stability, the PFL controller shows more promising results. The only major drawback in the PFL controller in terms of its comparison to the proposed Kron's reduction method in [29] is that it considers the complete information of angles and voltages of the available generator. To overcome that issue, a robust non-linear controller was suggested in [30] to achieve an enhancement in transients stability within a time limit of 3s when the delay in the form of transients is 400ms.…”

Section: A Comparative Analysis With Existing Workmentioning

confidence: 99%

Cascading Failures Assessment in Renewable Integrated Power Grids Under Multiple Faults Contingencies

et al. 2021

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Cascading overload failures occurred in power systems due to higher penetration of renewable energy resources (RERs), which causes uncertainty in a grid. To overcome these cascading overload failures, proper assessment in the form of load flow balancing and transients stability is required in renewable integrated power grids (RIPGs). This problem becomes more critical in the occurrence of multiple intervals faults in multiple interconnected RIPGs, which causes the tripping of several RERs. Due to which outages occurred in various transmission lines, which lead the power system to cascading overload failures. To tackle this problem, hybrid probabilistic modeling is proposed in this paper for balancing load flow and an assessment of transients stability in multiple interconnected RIPGs. For balancing of load flow, a smart node transmission network topology is utilized along with integrating a unified power flow controller (UPFC), while transients instabilities are assessed through a UPFC alone. Contrary to the previously proposed algorithms, which are only suitable to compensate network instabilities in case of only a single interval fault, this work is supported by probabilistic modeling to compensate network instabilities under the occurrence of not only a single interval fault but also in case of more severe multiple intervals faults in multiple interconnected RIPGs that will lead the network to cascading failure outages. Simulation results verify that our proposed probabilistic algorithm achieved near an optimal performance by outperforming the existing proposed methodologies, which are only confined to mitigate the effect of network instabilities only in case of single interval fault and fails to address these network instabilities under the occurrence of severe multiple interval faults, which leads the network to cascading failure outages. These simulation results are also validated through an industrial case study performed on a western Denmark transmission network to show the superiority of our proposed algorithm. INDEX TERMS multiple interconnected renewable integrated power grid; Transient stability analysis; cascading overload failures; single and multiple interval faults;

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Section: A Comparative Analysis With Existing Workmentioning

confidence: 99%

Cascading Failures Assessment in Renewable Integrated Power Grids Under Multiple Faults Contingencies

et al. 2021

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“…However, for inverter-based microgrids, explicit accounting for line dynamics is crucial for small-signal stability analysis, and derivative terms in equations (2g) and (2h) cannot be neglected [7], [8]. Nevertheless, a nodal representation of (2) and, more importantly, Kron reduction is still possible under uniform R/X assumption [19], [20], and will be discussed in the following subsection.…”

Section: Modeling Approachmentioning

confidence: 99%

Identification of Stability Regions in Inverter-Based Microgrids

Gorbunov,

Peng,

Bialek

et al. 2021

Preprint

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A new method for the stability assessment of inverter-based microgrids is presented in this paper. Directly determining stability boundaries by searching the multidimensional space of inverters' droop gains is a computationally prohibitive task. Instead, we build a certified stability region by utilizing a generalized Laplacian matrix eigenvalues, which are a measure of proximity to stability boundary. We establish an upper threshold for the eigenvalues that determines the stability boundary of the entire system and demonstrate that this value depends only on the network's R/X ratio but does not depend on the grid topology. We also provide a conservative upper threshold of the eigenvalues that are universal for any systems within a reasonable range of R/X ratios. We then construct approximate certified stability regions representing convex sets in the multidimensional space of droop gains that could be utilized for gains optimization. We show how the certified stability region can be maximized by properly choosing droop gains, and we provide closed-form analytic expressions for the certified stability regions. The computational complexity of our method is almost independent of the number of inverters. The proposed methodology has been tested using IEEE 123 node test system with 10 inverters.

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“…In particular, we have a DC voltage source for modeling a generic renewable resource and a VSC is controlled in order to supply a local load, connected to the Point of Common Coupling (PCC) through an RLC filter. We highlight that, as shown in [21,22], also more general interconnections of loads and DGUs can be mapped into this setting by means of a network reduction method known as Kron reduction. We further assume that loads I Li are unknown and act as current disturbances [6].…”

Section: Microgrid Modelmentioning

confidence: 99%

A scalable, line-independent control design algorithm for voltage and frequency stabilization in AC islanded microgrids

Tucci

Ferrari-Trecate

2020

Automatica

Self Cite

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We propose a decentralized control synthesis procedure for stabilizing voltage and frequency in AC Islanded microGrids (ImGs) composed of Distributed Generation Units (DGUs) and loads interconnected through power lines. The presented approach enables Plug-and-Play (PnP) operations, meaning that DGUs can be added or removed without compromising the overall ImG stability. The main feature of our approach is that the proposed design algorithm is line-independent. This implies that (i) the synthesis of each local controller requires only the parameters of the corresponding DGU and not the model of power lines connecting neighboring DGUs, and (ii) whenever a new DGU is plugged in, DGUs physically coupled with it do not have to retune their regulators because of the new power line connected to them. Moreover, we formally prove that stabilizing local controllers can be always computed, independently of the electrical parameters. Theoretical results are validated by simulating in PSCAD the behavior of a 10-DGUs ImG.

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Plug-and-play control of AC islanded microgrids with general topology

Cited by 21 publications

References 16 publications

Cascading Failures Assessment in Renewable Integrated Power Grids Under Multiple Faults Contingencies

Cascading Failures Assessment in Renewable Integrated Power Grids Under Multiple Faults Contingencies

Identification of Stability Regions in Inverter-Based Microgrids

A scalable, line-independent control design algorithm for voltage and frequency stabilization in AC islanded microgrids

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