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Autonomous Domain Correlation-Based Cross-domain Network View Caching Method for SDN distributed controller

Chinese Journal of Electronics 2016年第6期25卷 1127-1133页

作者： FU Tao HU Liang CHAI Sheng CHE Xilong College of Computer Science and Technology Jilin University Key Laboratory of Symbolic Computing and Knowledge Engineering of Ministry of Education Jilin University

Software-defined networks(SDN) maintain a global view of the network, thus improving the intelligence of forwarding decisions. With the expansion of the network scale, distributed controllers are used in a variety of large-scale networks in which subnetworks managed by controller instance are called autonomous domains. We analyze statistic frequency of communication across the autonomous domain. We calculate the autonomous domain correlations for controller instances using acquired statistical information. We cache network views to highly correlated controller instances. distributed controllers are capable of considering both the average response time and overall storage. An experiment shows that our method can fully take advantage of these two performance indicators.

关键词： Software-defined networks(SDN) distributed controller Network analyze Network view cache

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Efficient greedy heuristic approach for fault-tolerant distributed controller placement in scalable SDN architecture

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CLUSTER COMPUTING-THE JOURNAL OF NETWORKS SOFTWARE TOOLS AND APPLICATIONS 2022年第6期25卷 4543-4572页

作者： Salam, Rakesh Bhattacharya, Ansuman Indian Inst Technol Indian Sch Mines Dept Comp Sci & Engn Dhanbad 826004 Bihar India

Software-Defined Network (SDN) enables a centralized networking architecture that employs controllers to administer a global view of the network. However, the architecture of SDN and OpenFlow are susceptible to scalability and reliability issues. In fact, the problem of determining the requisite number of controllers and their locations in SDNs while maximizing the fault tolerance, i.e., controller Placement Problem (CPP), is NP-hard. Besides, the communication latency between the forwarding nodes and the controllers are usually very high in large-scale SDNs due to sparse deployment. This paper first formulates the CPP as Nonlinear Programming (NLP). Then, we present an efficient greedy heuristic method that employs a local Optimized High Degree and Independent Dominating Set (OHDIDS) strategy to address these issues. In particular, we examine the CPP based on Silhouette analysis, Gap Statistics, and Faster Partitioning Around Medoids (FPAM) techniques. We conduct extensive experiments using Internet Topology Zoo and Mininet network simulators to show the efficacy of the proposed method with various network topologies. The proposed method outperforms the state-of-the-art methods in terms of the minimum number of controllers, average-case and worst-case latency, and reliability. We observed that our method reduces the average communication latency by 57% when two controllers are used rather than a single controller. Moreover, it achieves a performance gain of up to 19.31% in terms of average propagation latency.

关键词： Software-Defined Network (SDN) OpenFlow controller Placement Problem (CPP) Fault tolerance distributed controller Nonlinear Programming (NLP)

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Robust Nonlinear distributed controller Design for Active and Reactive Power Sharing in Islanded Microgrids

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IEEE TRANSACTIONS ON ENERGY CONVERSION 2014年第4期29卷 893-903页

作者： Mahmud, M. A. Hossain, M. J. Pota, H. R. Oo, A. M. T. Swinburne Univ Technol Sch Software & Elect Engn Hawthorn Vic 3122 Australia Griffith Univ Griffith Sch Engn Gold Coast Qld 4222 Australia Univ New S Wales Sch Engn & Informat Technol Canberra ACT 2600 Australia Deakin Univ Sch Engn Geelong Vic 3220 Australia

This paper presents a robust nonlinear distributed controller design for islanded operation of microgrids in order to maintain active and reactive power balance. In this paper, microgrids are considered as inverter-dominated networks integrated with renewable energy sources (RESs) and battery energy storage systems (BESSs), where solar photovoltaic generators act as RESs and plug-in hybrid electric vehicles as BESSs to supply power into the grid. The proposed controller is designed by using partial feedback linearization and the robustness of this control scheme is ensured by considering structured uncertainties within the RESs and BESSs. An approach for modeling the uncertainties through the satisfaction of matching conditions is also provided in this paper. The proposed distributed control scheme requires information from local and neighboring generators to communicate with each other and the communication among RESs, BESSs, and control centers is developed by using the concept of the graph theory. Finally, the performance of the proposed robust controller is demonstrated on a test microgrid and simulation results indicate the superiority of the proposed scheme under different operating conditions as compared to a linear-quadratic-regulator-based controller.

关键词： distributed controller graph theory microgrid partial feedback linearization uncertainty modeling

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Classification of SDN distributed controller approaches: a brief overview 3

Classification of SDN distributed controller approaches: a b...

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3rd International Conference on Advances in Computing, Communication and Engineering (ICACCE)

作者： Nkosi, Mpho Lysko, Albert Ravhuanzwo, Lusani Nandeni, Thulani Engelberencht, Andries CSIR Meraka Inst Pretoria South Africa Univ Pretoria Dept Comp Sci Pretoria South Africa

ISBN: (纸本)9781509025763

Software defined networking offers a capability of separating control plane from data plane. The control plane is the key component of a network which ensures smooth management and operation of the entire network. However, network's resiliency and availability offered by SDN single centralized controller architecture is prone to single point of failure. Network operators are rather looking at distributed controllers' deployment to ensure better network resiliency and availability. This paper gives a brief overview of approaches available for distributed controller deployment and also highlights some of the challenges experienced in the SDN distributed controller environments.

关键词： Software Defined Networking (SDN) Application Programming Interface(API) distributed controller

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A distributed controller Approach Using P2P Protocol for Software Defined Networks

A Distributed Controller Approach Using P2P Protocol for Sof...

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International Conference on Advanced Computing and Applications (ACOMP)

作者： Ha Manh Tran Son Thanh Le Hai-Duong Le An Thanh Tran Int Univ Vietnam Natl Univ Sch Comp Sci & Engn Ho Chi Minh City Vietnam

ISBN: (纸本)9781538691861

The main advantage of software defined network (SDN) is a separation of data and control planes to facilitate network management functions. This separation nevertheless poses a scalability and availability problem for controllers in the control plane. controllers become a single point of failure in SDN. This paper presents an approach of a hybrid controller network for improving scalability and availability in both local and global domains. This approach extends controller architecture to providing direct communication among controllers in the global domain. It applies a peer-to-peer (P2P) protocol for controllers to facilitate group formation and data synchronization. We have extended the prototyping implementation of the Gnutella protocol to evaluate the performance of the hybrid controller network and to simulate controller failure and switch migration. The experimental results show that controllers perform large data update efficiently with low extra workload as number of controllers increase significantly.

关键词： distributed controller Software Defined Network Gnutella Protocol Scalability Availability

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Nonlinear distributed controller Design for Maintaining Power Balance in Islanded Microgrids

Nonlinear Distributed Controller Design for Maintaining Powe...

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IEEE PES General Meeting

作者： Mahmud, M. A. Hossain, M. J. Pota, H. R. Roy, N. K. Swinburne Univ Technol Fac Engn & Ind Sci Hawthorn Vic 3122 Australia

ISBN: (纸本)9781479964154

This paper presents a nonlinear distributed controller design for islanded operation of microgrids in order to maintain active and reactive power balance. In this paper, the microgrids are considered as inverter-dominated networks integrated with renewable energy sources (RESs) and battery energy storage systems (BESSs) where solar photovoltaic (PV) generators act as RESs and plug-in hybrid electric vehicles (PHEVs) as BESSs to supply power into the grid. The detail dynamic models of PV generators and BESSs are also developed in this paper. The proposed distributed control scheme gathers information from local and neighboring generators to achieve the desired control objectives. The proposed controller is designed by using feedback linearization and the communication between generators and control centers is developed by using the concept of graph theory. Finally the performance of the proposed controller is demonstrated on a test microgrid and simulation results indicate the superiority under different operating conditions as compared to a linear quadratic regulator (LQR)-based controller.

关键词： Partial feedback linearization distributed controller microgrid graph theory

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High-Level Synthesis with distributed controller for Fast Timing Closure

High-Level Synthesis with Distributed Controller for Fast Ti...

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IEEE/ACM International Conference on Computer-Aided Design (ICCAD)

作者： Lee, Seokhyun Choi, Kiyoung Seoul Natl Univ Seoul South Korea

ISBN: (纸本)9781457713989

Centralized controllers commonly used in high-level synthesis often cause long wires and high load capacitance and that is why critical paths typically occur on paths from controllers to data registers. However, conventional high level synthesis has focused on the delay of datapaths making it difficult to solve the timing closure problem during physical synthesis. This paper presents a hardware architecture with a distributed controller, which makes the timing closure problem much easier. It also presents a novel high-level synthesis flow for synthesizing such hardware through datapath partitioning and controller optimization. According to our experimental results, the proposed approach reduces the controller and interconnect delay by 20.3-27.4% and the entire critical path delay by 6.6 similar to 10.3% with 0.2 similar to 13.3% area overhead. Even without area overhead, it reduces the critical path delay by 5.8 similar to 10%.

关键词： high level synthesis distributed controller controller optimization timing closure

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Synchronising H ∞ Robust distributed controller for Multi-Robotic Manipulators ⁎

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IFAC-PapersOnLine 2020年第2期53卷 9944-9949页

作者： A. Farnam G. Crevecoeur Department of Electrical Energy Metals Mechanical Constructions and Systems Ghent University B-9052 Ghent Belgium. EEDT Decision and Control Flanders Make.

In this paper the problem of synchronisation of multiple robotic manipulators using Hoo robust distributed control systems with respect to the parameter uncertainties and disturbance inputs acting on the manipulators is addressed. Robust synchronising controllers only use the information of outputs of the manipulators, and the corresponding parameters of these output-feedback controllers are designed by computing a series of linear matrix inequalities instead of solving the complex differential (e.g. Hamilton-Jacobi) (in)equalities. The proposed controller can guarantee H ∞ robust performance with respect to the external disturbance inputs and parameters uncertainties, asymptotic stability and synchronisation in the networked manipulators. Using an illustrative example we compare the results extracted in this paper to other works existing in the literature.

关键词： Robotic manipulators distributed controller linear matrix inequalities (LMIs) disturbance inputs parameter uncertainties

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Design and Analysis of the distributed controller for the Modular Multilevel Cascaded Converter

Design and Analysis of the Distributed Controller for the Mo...

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International Power Electronics Conference

作者： Ping-heng Wu Yu-chen Su Po-tai Cheng National Tsing Hua University Hsinchu TW

The modular multilevel cascaded converter (MMCC) has in recent years drawn interest for applying in the utility-scale photovoltaic (PV) and the battery energy storage (BES) systems. However, the large numbers of the cascaded modules lead to the difficulty of the implementation with a centralized control architecture. The paper [1] has proposed a distributed control strategy which significantly reduces the complexity and increases the flexibility to expand the system. This paper continues the research which analyzes the operation range of each module and its fault tolerant capability. The analysis provides a guideline to design the MMCC controller based on the distributed control approach. Simulation and experimental results are carried out on a star-connected cascaded converter to validate the analysis.

关键词： distributed controller the Modular Multilevel Cascaded Converter

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Nonlinear distributed controller Design for Maintaining Power Balance in Islanded Microgrids

Nonlinear Distributed Controller Design for Maintaining Powe...

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IEEE Power and Energy Society General Meeting

作者： M. A. Mahmud M. J. Hossain H. R. Pota N. K. Roy Faculty of Engineering and Industrial Sciences Swinburne University of Technology Griffith School of Engineering Griffith University School of Engineering and Information Technology (SEIT) The University of New South Wales

ISBN: (纸本)9781479964161

关键词： Partial feedback linearization distributed controller Microgrid Graph theory

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