Performance Evaluation of Secondary Control Policies with Respect to Digital Communications Properties in Inverter-based Islanded Microgrids

Martí, Pau; Velasco, Manel; Martín, Enric; Vicuña, Luis García de; Miret, Jaume; Castilla, Miguel

doi:10.1109/tsg.2016.2608323

Cited by 40 publications

(33 citation statements)

References 37 publications

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“…Note however that the specific effect that communications have in the performance of the analyzed polices has not characterized. The performance evaluation paper [33] focuses on this topic.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Clock Drifts on Frequency Regulation and Power Sharing in Inverter-Based Islanded Microgrids

Martí

Torres-Martínez

Rosero

et al. 2018

IEEE Trans. Power Electron.

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Local hardware clocks in physically distributed computation devices hardly ever agree because clocks drift apart and the drift can be different for each device. This paper analyses the effect that local clock drifts have in the parallel operation of voltage source inverters (VSIs) in islanded microgrids (MG). The state-of-the-art control policies for frequency regulation and active power sharing in VSIs-based MGs are reviewed and selected prototype policies are then re-formulated in terms of clock drifts. Next, steady-state properties for these policies are analyzed. For each of the policies, analytical expressions are developed to provide an exact quantification of the impact that drifts have on frequency and active power equilibrium points. In addition, a closed-loop model that accommodates all the policies is derived, and the stability of the equilibrium points is characterized in terms of the clock drifts. Finally, the implementation of the analyzed policies in a laboratory MG provides experimental results that confirm the theoretical analysis.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Effect of Clock Drifts on Frequency Regulation and Power Sharing in Inverter-Based Islanded Microgrids

Martí

Torres-Martínez

Rosero

et al. 2018

IEEE Trans. Power Electron.

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“…In [12], conditions for robust non-linear stability of MGs operated with a distributed averaging integral controller under fast-varying time-delays and switching communication topology are derived. Furthermore, various secondary frequency control policies are compared in [13]. In particular, the effects of communication properties on different strategies, such as, centralized, decentralized, averaging and consensus strategies, are analysed in a quantitative way.…”

Section: Introductionmentioning

confidence: 99%

Steady state evaluation of distributed secondary frequency control strategies for microgrids in the presence of clock drifts

Krishna

Hans

Schiffer

et al. 2017

2017 25th Mediterranean Conference on Control and Automation (MED)

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©2017 IEEE. This is an author produced version of a paper published in Proceedings of 25th Mediterranean Conference on Control and Automation. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Uploaded in accordance with the publisher's self-archiving policy.eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.Steady state evaluation of distributed secondary frequency control strategies for microgrids in the presence of clock drifts* Abstract-Secondary frequency control, i.e., the task of restoring the network frequency to its nominal value following a disturbance, is an important control objective in microgrids. In the present paper, we compare distributed secondary control strategies with regard to their behaviour under the explicit consideration of clock drifts. In particular we show that, if not considered in the tuning procedure, the presence of clock drifts may impair an accurate frequency restoration and power sharing. As a consequence, we derive tuning criteria such that zero steady state frequency deviation and power sharing is achieved even in the presence of clock drifts. Furthermore, the effects of clock drifts of the individual inverters on the different control strategies are discussed analytically and in a numerical case study.

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“…Furthermore, the fast nature of MG secondary control makes them more prone to communication weaknesses compared to conventional secondary controls on larger power systems. Several recent works have assessed the robustness of MGs secondary control methods against time delays [56][57][58][59][60], using random modelling of the delays for centralized control [56] or Markov chains modelling of the delays for distributed secondary control [57]. Most of these studies focus on frequency and voltage regulation controllers, however optimal energy management controls on the secondary levels can be also affected by communication delays [58].…”

Section: Secondary Controlmentioning

confidence: 99%

The Evolution of Research in Microgrids Control

Vasilakis

Zafeiratou

Lagos

et al. 2020

IEEE Open J. Power Energy

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Microgrids (MGs), as novel paradigms of active Distribution Networks, have been gaining increasing interest by the research community in the last 20 years. Currently, they are considered as key components in power system decentralization, providing viable solutions for rural electrification, enhancing resilience and supporting local energy communities. Their main characteristic is the coordinated control of the interconnected distributed energy resources (DER), which can be realized by various methods, ranging from decentralized communicationfree approaches to centralized ones, where decisions are taken at a central point. This paper provides an overview of this development focusing on the technical control solutions proposed by reseachers for the various levels of MG organization hierarchy. A critical assessment of selected, popular technologies is provided and open research questions regarding the trend to more decentralized power systems are discussed.

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Performance Evaluation of Secondary Control Policies with Respect to Digital Communications Properties in Inverter-based Islanded Microgrids

Cited by 40 publications

References 37 publications

Analysis of the Effect of Clock Drifts on Frequency Regulation and Power Sharing in Inverter-Based Islanded Microgrids

Analysis of the Effect of Clock Drifts on Frequency Regulation and Power Sharing in Inverter-Based Islanded Microgrids

Steady state evaluation of distributed secondary frequency control strategies for microgrids in the presence of clock drifts

The Evolution of Research in Microgrids Control

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