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Plug-and-play control and consensus algorithms for current sharing in DC microgrids

IFAC-PapersOnLine 2017年第1期50卷 12440-12445页

作者： Tucci, Michele Meng, Lexuan Guerrero, Josep M. Ferrari-Trecate, Giancarlo Dipartimento di Ingegneria Industriale e dell'Informazione Università degli Studi di Pavia Denmark Institute of Energy Technology Aalborg University Aalborg9220 Denmark Switzerland

In this paper, we propose a secondary consensus-based control layer for current sharing and voltage balancing in DC microGrids (mGs). Differently from existing approaches based on droop control, we assume decentralized Plug-and-Play (PnP) regulators at the primary level, as they provide voltage stabilization and their design complexity is independent of the mG size. We analyze the behavior of the closed-loop mG by approximating local primary control loops with unitary gains. This analysis can be extended to the more complex case where primary control loops are abstracted into first-order transfer functions (Tucci et al., 2016a). Besides showing stability, current sharing, and voltage balancing in the asymptotic régime, we describe how to design secondary controllers in a PnP fashion when Distributed Generation Units (DGUs) are added or removed. Theoretical results are complemented by simulations using a 5-DGUs mG implemented in Simulink/PLECS. © 2017

关键词： Complex networks Asymptotic stability Distributed parameter control systems Renewable energy resources Voltage control consensus algorithms Design complexity Distributed control Distributed generation units Electrical networks Renewable energy systems Voltage balancing Voltage stabilization

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On the Nonexistence of Quadratic Lyapunov Functions for consensus algorithms

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IEEE TRANSACTIONS ON AUTOMATIC CONTROL 2008年第11期53卷 2642-2645页

作者： Olshevsky, Alex Tsitsiklis, John N. MIT Informat & Decis Syst Lab Cambridge MA 02139 USA

We provide an example proving that there exists no quadratic Lyapunov function for a certain class of linear agreement/consensus algorithms, a fact that had been numerically verified in [6]. We also briefly discuss su... 详细信息

关键词： consensus algorithms Lyapunov theory multi-agent systems

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WOLFOWITZ'S THEOREM AND consensus algorithms IN HADAMARD SPACES

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PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY 2015年第10期143卷 4403-4414页

作者： Grohs, P. Swiss Fed Inst Technol Zurich Dept Math CH-8092 Zurich Switzerland

We provide a generalization of Wolfowitz's theorem on the products of stochastic, indecomposable and aperiodic (SIA) matrices to metric spaces with nonpositive curvature. As a result we show convergence for a wide... 详细信息

关键词： SIA matrices consensus algorithms Hadamard space Wolfowitz theorem

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Convergence of max-min consensus algorithms

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AUTOMATICA 2015年 62卷 11-17页

作者： Shi, Guodong Xia, Weiguo Johansson, Karl Henrik Australian Natl Univ Res Sch Engn Canberra ACT 0200 Australia Dalian Univ Technol Sch Control Sci & Engn Dalian Peoples R China Royal Inst Technol Sch Elect Engn ACCESS Linnaeus Ctr Stockholm Sweden

In this paper, we propose a distributed max-min consensus algorithm for a discrete-time n-node system. Each node iteratively updates its state to a weighted average of its own state together with the minimum and maximum states of its neighbors. In order for carrying out this update, each node needs to know the positive direction of the state axis, as some additional information besides the relative states from the neighbors. Various necessary and/or sufficient conditions are established for the proposed max-min consensus algorithm under time-varying interaction graphs. These convergence conditions do not rely on the assumption on the positive lower bound of the arc weights. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： consensus algorithms Time-dependent graphs Asymptotic convergence

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Next-Generation Relay Voting Scheme Design Leveraging consensus algorithms

Next-Generation Relay Voting Scheme Design Leveraging Consen...

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IEEE Power and Energy Conference at Illinois (PECI)

作者： Jacobs, Nicholas Summers, Adam Hossain-McKenzie, Shamina Calzada, Daniel Li, Hanyue Mao, Zeyu Goes, Chris Davis, Katherine Shetye, Komal Sandia Natl Labs Livermore CA 94550 USA Texas A&M Univ College Stn TX 77843 USA

ISBN: (纸本)9781728186481

Traditional protective relay voting schemes utilize simple logic to achieve confidence in relay trip actions. However, the smart grid is rapidly evolving and there are new needs for a next-generation relay voting scheme. In such new schemes, aspects such as inter-relay relationships and out-of-band data can be included. In this work, we explore the use of consensus algorithms and how they can be utilized for groups of relays to vote on system protection actions and also reach consensus on the values of variables in the system. A proposed design is explored with a simple case study with two different scenarios, including simulation in PowerWorld Simulator, to demonstrate the consensus algorithm benefits and future directions are discussed.

关键词： cyber-physical system protective relays consensus algorithms voting schemes

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AVERAGE consensus algorithms ROBUST AGAINST CHANNEL NOISE

AVERAGE CONSENSUS ALGORITHMS ROBUST AGAINST CHANNEL NOISE

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9th IEEE Workshop on Signal Processing Advances in Wireless Communications

作者： Pescosolido, Loreto Barbarossa, Sergio Scutari, Gesualdo Univ Roma La Sapienza INFOCOM Dept Via Eudossiana 18 I-00184 Rome Italy

ISBN: (纸本)9781424420452

Average consensus algorithms have attracted popularity in the wireless sensor network scenario as a simple way to compute linear combinations of the observations gathered by the sensors, in a totally decentralized fashion, i.e., without a fusion center. However, average consensus techniques involve the iterated exchange of data among sensors. In a practical implementation, this interaction is affected by noise. The goal of this paper is to bring some common adaptive signal processing techniques into the sensor network context in order to robustify the iterative exchange of data against communication noise. In particular, we will compare the performance of two algorithms: a) a method, reminiscent of stochastic approximation algorithms, using a decreasing step size, with proper decaying law, and b) a leakage method imposing that the consensus cannot be too distant from the initial measurements. We provide a theoretical analysis, validated by simulation results, of both methods to show how to derive the best tradeoff between the system parameters in order to get the minimum estimation variance, taking into account both observation and interaction noise.

关键词： sensor networks consensus algorithms TBMA

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Binding Efficiency and Robustness for Blockchains using Reputation-based Byzantine Fault-Tolerant consensus algorithms 23

Binding Efficiency and Robustness for Blockchains using Repu...

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23rd International Middleware Conference Doctoral Symposium (Middleware) Part of Middleware Conference

作者： Zhang, Gengrui Univ Toronto Dept Elect & Comp Engn Toronto ON Canada

ISBN: (纸本)9781450399425

Leader-based Byzantine fault-tolerant consensus algorithms suffer from vulnerabilities during routine view changes as they often follow a predefined schedule to passively rotate leadership among servers. However, the rotation becomes problematic under failures. In particular, when a scheduled server has crashed, the rotation still blindly assigns leadership to that server, causing performance degradation. This problem is exacerbated with further pronounced performance degradation when leadership rotation becomes more frequent. To address this problem, we propose a reputation-bounded active view-change protocol. Each server maintains a reputation state, calculated based on its behavior history, that reflects the likeli-hood of its correctness. During view changes, servers with a higher reputation are more likely to be elected, suppressing Byzantine faults while increasing the presence of correct leaders.

关键词： consensus algorithms Byzantine fault tolerance

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Distributed Collaborative Control of Reconfigurable Battery Energy Storage Based on consensus algorithms 9

Distributed Collaborative Control of Reconfigurable Battery ...

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9th International Conference on Power and Renewable Energy

作者： Wang, Manshang Xu, Yiran Guo, Jinkun Jiang, Libo Zheng, Tianwen Zhenjiang Power Supply Co State Grid Jiangsu Elect Power Co Ltd Zhenjiang Jiangsu Peoples R China Tsinghua Univ Sichuan Energy Internet Res Inst Chengdu Sichuan Peoples R China

ISBN: (纸本)9798350377477;9798350377460

To enhance the high-reliability operation capability of reconfigurable battery energy storage systems, a distributed cooperative control method of reconfigurable battery energy storage based on consensus algorithms is proposed in this paper, which can improve the frequency and power characteristics of the system. Firstly, the mathematical model of virtual synchronous generator(VSG) control, the structure of reconfigurable battery energy storage system, and the parallel VSG distributed architecture are introduced;Secondly, combined with the mathematical model of VSG control, the overall scheme of frequency recovery and power output reasonable distribution of VSG parallel system is designed;Then, according to the structural characteristics of reconfigurable battery energy storage, a battery pack reconfiguration strategy is proposed, which can meet the power output demand through the free combination of battery packs;Finally, a simulation model is built in Matlab/Simulink environment, and the simulation results verify the correctness and effectiveness of the proposed method.

关键词： Reconfigurable battery energy storage consensus algorithms Collaborative control Frequency recovery Power distribution

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Order in Chaos: Prioritizing Mobile App Reviews using consensus algorithms 44

Order in Chaos: Prioritizing Mobile App Reviews using Consen...

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44th Annual IEEE-Computer-Society International Conference on Computers, Software, and Applications (COMPSAC)

作者： Etaiwi, Layan Hamel, Sylvie Gueheneu, Yann-Gael Flageol, William Morales, Rodrigo Polytech Montreal Montreal PQ Canada Univ Montreal Montreal PQ Canada Concordia Univ Montreal PQ Canada

ISBN: (数字)9781728173030

ISBN: (纸本)9781728173030

The continuous growth of the mobile apps industry creates a competition among apps developers. To succeed, app developers must attract and retain users. User reviews provide a wealth of information about bugs to fix and features to add and can help app developers offer high-quality apps. However, apps may receive hundreds of unstructured reviews, which makes transforming them into change requests a difficult task. Approaches exist for analyzing and extracting topics from mobile app reviews, however, prioritizing these reviews has not gained much attention. In this study, we introduce the use of a consensus algorithm to help developers prioritize user reviews for the purpose of app evolution. We evaluate the usefulness of our approach and meaningfulness of its consensus rankings on four Android apps. We compare the rankings against reviews ranked by app developers manually and show that there is a strong correlation between the two (average Kendall rank correlation coefficient = 0.516). Thus, our approach can prioritize user reviews and help developers focus their time/effort on improving their apps instead of on identifying reviews to address in the next release.

关键词： consensus algorithms Rankings Review prioritization User reviews Software evolution

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Classification of the DLT consensus algorithms with Focus on Blockchain 6th

Classification of the DLT Consensus Algorithms with Focus on...

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6th World Conference on Smart Trends in Systems Security and Sustainability (WorldS4)

作者： Chenchev, Ivaylo Univ Telecommun & Post Sofia Bulgaria

ISBN: (纸本)9789811976629;9789811976636

The blockchain technology attracted great scientific and applied interest in the last six-seven years. It successfully applies in different areas like fintech, smart cities, IoT, health care, banking, retail, oil industries, and many others. Regardless of the blockchain type (permissioned or permissionless), the data that must be stored in the blockchain network. The algorithm, which is used to "decide" whether to approve (confirm) or not storing the data in the network is the consensus algorithm. It is very important component of the proper blockchain functioning. The author is pursuing two goals with this research. The first one is to make a thorough retrieval of articles from different publishers, based on few keywords, and check if there are any specific trends of research interests in the recent years around these keywords. The second goal is to identify some classifications criteria-like types (public, private, hybrid, and federated), like layers (two layers and multi-layer), etc., and finally, to classify the existing Distributed Ledger Technology (DLT) consensus algorithms with focus on blockchain, based on the architecture and on the access type.

关键词： Blockchain DLT consensus algorithms Permissioned Permissionless Hybrid Federated Private sector Public sector Proof-based Voting-based

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