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检索条件"主题词=Consensus algorithm"

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Distributed Voltage Control in Distribution Networks with Electric Vehicle Charging Stations and Photovoltaic Generators

Distributed Voltage Control in Distribution Networks with El...

引用

作者： Hanlin Li University of Windsor

学位级别：硕士

The developments of distributed generators (DGs) and electric vehicles (EVs) are dramatical due to the rapid increase of friendly environment desire. While on another hand, the proliferation of distributed generators (DGs) and electric vehicle charging stations (EVCSs) has brought voltage regulation challenges to distribution systems due to their high generations and heavy loads. In this thesis, a distributed control strategy is proposed which mainly consisted by a reactive compensation algorithm to dispatch surplus reactive power from DGs and EVCSs for proper voltage regulation without violating their converters’ capacity limits or stressing conventional voltage control devices, i.e., on-load tap changers (OLTCs), and an active power curtailment algorithm for DGs to properly integrate OLTC in voltage regulation when the reactive power compensation is deficient. The proposed control algorithms rely on consensus theory and sensitivity analysis, thus, minimizing the active and reactive powers needed for voltage support, and decreasing the net cost of voltage regulation. In the proposed control strategy, three distributed voltage regulation algorithms, as well as a distributed control method for OLTC, are developed and coordinated to realize adequate voltage maintaining effects. Simulation results of a typical distribution system confirm the effectiveness and robustness of the proposed distributed control strategy in continuously maintaining proper voltage regulation for the whole distribution system with minimum power demands from DGs and EVCSs, and reduced tap operation for OLTC, within every 24 hours.

关键词： consensus algorithm distributed generator electric vehicle charging station sensitivity analysis voltage regulation

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ENERGY EFFICIENT consensus OVER DIRECTED GRAPHS

ENERGY EFFICIENT CONSENSUS OVER DIRECTED GRAPHS

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IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Asensio-Marco, Cesar Beferull-Lozano, Baltasar Univ Agder Dept ICT Intelligent Signal Proc & Wireless Networks WISEN Grimstad Norway

ISBN: (纸本)9781538646588

consensus algorithms are iterative methods that represent a basic building block to achieve superior functionalities in increasingly complex sensor networks by facilitating the implementation of many signal-processing tasks in a distributed manner. Due to the heterogeneity of the devices, which may present very different capabilities (e.g. energy supply, transmission range), the energy often becomes a scarce resource and the communications turn into directed. To maximize the network lifetime, a magnitude that in this work measures the number of consensus processes that can be executed before the first node in the network runs out of battery, we propose a topology optimization methodology for directed networks. Numerical results corroborate the merits of this work.

关键词： Energy efficiency consensus algorithm directed graph wireless sensor networks

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Convergence Rate of consensus in a Network of Networks 57

Convergence Rate of Consensus in a Network of Networks

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57th IEEE Conference on Decision and Control (CDC)

作者： Das, Anirban Yi, Yuhao Patterson, Stacy Bamieh, Bassam Zhang, Zhongzhi Rensselaer Polytech Inst Dept Comp Sci Troy NY 12180 USA UC Santa Barbara Dept Mech Engn Santa Barbara CA 93106 USA Fudan Univ Sch Comp Sci Shanghai Key Lab Intelligent Informat Proc Shanghai 200433 Peoples R China

ISBN: (纸本)9781538613955

We study the convergence rate of consensus algorithms in a Network of Networks model. In this model, there is a collection of networks, and these individual networks are connected to one another using a small number of links to form a composite graph. We consider a setting where the links between networks are costly to use, and therefore, are used less frequently than links within each network. We model this setting using a stochastic system where, in each iteration, the inter-network links are active with some small probability. Using spectral perturbation theory, we analyze the convergence rate of this system, up to first order in this activation probability. Our analysis shows that the convergence rate is independent of the topologies of the individual graphs;the rate depends only on the number of nodes in each graph and the topology of the connecting edges. We further highlight these theoretical results through numerical examples.

关键词： Convergence Eigenvalues and eigenfunctions Perturbation methods Topology consensus algorithm Stochastic systems Network topology

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A consensus-based Distributed Clock Synchronization for Wireless Sensor Network 14

A Consensus-based Distributed Clock Synchronization for Wire...

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14th IEEE International Wireless Communications and Mobile Computing Conference (IWCMC)

作者： Zhu, Lin Shi, Shuo Gu, Xuemai Harbin Inst Technol Electron Informat Engn Sch Harbin Heilongjiang Peoples R China

ISBN: (纸本)9781538620700

With the increasing demand and the consensus algorithm widely used for clock synchronization in wireless sensor network, we propose a consensus-based distributed clock synchronization protocol (CDCS). The protocol based on the random broadcast scheme has advantage of being asynchronous, robust to node failure or appearance and totally distributed. We consider a network represented by a directed graph, which is simplified according to rules of the protocol, and simulations are presented to evaluate different synchronization schemes, where the proposed protocol shows promising performance.

关键词： Wireless Sensor Network consensus algorithm distributed clock synchronization random broadcast scheme

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Leader-following consensus and Trajectory Tracking for Nonholonomic Mobile Robots

Leader-following Consensus and Trajectory Tracking for Nonho...

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Chinese Automation Congress (CAC)

作者： Wu, Shuang Xia, Yuanqing Lin, Min Luo, Yu Beijing Inst Technol Sch Automat Beijing Peoples R China

ISBN: (纸本)9781728113128

In this paper, a trajectory tracking algorithm for leader and a leader-following consensus control law for followers are investigated for nonholonomic mobile robots. First, by using the trajectory tracking algorithm, the leader can be guaranteed on the desired position, attitude, velocity and angular velocity. Second, based on the traditional consensus problem of multi-agent systems, we propose an improved consensus algorithm to account for input saturations and remove the requirement of velocity measurements. Finally, a convoy formation is achieved. In the formation, the leader moves in the trajectory expected in the mission, while the followers convoy the leader with a certain formation, which can be time-varying or time-invariant. The performance of the algorithm is demonstrated by simulation.

关键词： multi-agent formation consensus algorithm trajectory tracking nonholonomic constraints

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Randomization and Quantization for Average consensus 57

Randomization and Quantization for Average Consensus

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57th IEEE Conference on Decision and Control (CDC)

作者： Charron-Bost, Bernadette Lambein-Monette, Patrick Ecole Polytech Comp Sci Lab Palaiseau France

ISBN: (纸本)9781538613955

Many problems in distributed control reduce to the distributed computation of the average of initial values in a networked system of autonomous agents, known as the average consensus problem. We present a randomized algorithm that solves this problem in networks with directed, time-varying communication topologies, in linear time in the size of the network. This algorithm leverages properties of exponential random variables, which allows for approximating sums by computing minima. It is completely decentralized, in the sense that it does not rely on agent identifiers or global information of any kind. Besides, the agents do not need to know their out-degree;hence, our algorithm demonstrates how randomization can be used to circumvent the impossibility result established in [1]. Using a logarithmic rounding rule, we show that this algorithm can be used under the additional constraints of finite memory and channel capacity. We furthermore extend the algorithm with a termination test, by which the agents can decide irrevocably in finite time-rather than simply converge-on an estimate of the average.

关键词： Heuristic algorithms Topology Random variables Network topology Computational modeling Quantization (signal) consensus algorithm

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eRoc: A Distributed Blockchain System with Fast consensus

eRoc: A Distributed Blockchain System with Fast Consensus

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International Conference on Cyber-Enabled Distributed Computing and Knowledge Discovery, CyberC

作者： Lin Zhong Xihua Duan Yujue Wang Jingyan Chen Jidong Liu Xiaoguang Wang School of Cyber Science and Technology Beihang University Beijing China Beijing Rulex Technology Co. Ltd. Beijing China Guangxi Key Laboratory of Cryptography and Information Security Guilin University of Electronic Technology Guilin China Beijing Certificate Authority Beijing China

A consensus mechanism is one of the most important techniques in blockchain systems. However, existing consensus mechanisms have the problems of high latency and tending to centralization. To address these issues, we present a consensus algorithm eRoc with decentralization property. In eRoc, a verifiable random function (VRF) is employed to achieve cryptographic sortition such that a certain amount of blocks and votes will be broadcasted in the system. And the blocks and votes will be verified by all users. Thus, in each round all blocks are generated in a distributed way, and each block must be voted by most voters to become a consensus block. We propose a generic eRoc construction, analyze its security and liveness, and compare with related schemes. We also develop an eRoc prototype in C++ to evaluate its performance. The experimental results demonstrate that eRoc can reach consensus in 13 seconds for 30 blocks of 2M size, where the numbers of nodes, expected votes of each block, and threshold votes of a consensus block are 10k, 500, and 200, respectively.

关键词： Blockchain Throughput consensus algorithm Bitcoin Protocols

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Co-Regulating Communication for Asynchronous Information consensus 57

Co-Regulating Communication for Asynchronous Information Con...

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57th IEEE Conference on Decision and Control (CDC)

作者： Fernando, Chandima Detweiler, Carrick Bradley, Justin Univ Nebraska Dept Comp Sci & Engn Lincoln NE 68588 USA

ISBN: (纸本)9781538613955

Muti-agent consensus controllers typically use discrete communication and hence are restricted to fixed-rate or event-triggered communication. Fixed-rate communication suffers from inefficient use of communication and computational resources but is easy to implement, while event-triggered communication conserves resources but suffers from the ambiguity of all event-triggered systems-inability to distinguish failure from lack of new information. We propose a novel hybrid strategy of co-regulating communication with state disagreement amongst the agents obtaining the benefits of discrete fixed-rate and event-triggered consensus while mitigating the associated disadvantages. Our approach dynamically adjusts the communication rate in response to disagreement in the shared state variable, resulting in a discrete-time-varying, asynchronous network topology. We prove convergence properties of the proposed consensus algorithm, develop metrics to evaluate similar dynamic approaches, and demonstrate the results in simulation, showing our algorithm reduces communication resources, while maintaining fast convergence time.

关键词： Convergence consensus algorithm Network topology Heuristic algorithms Topology Clocks Synchronization

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consensus-based Secondary Frequency Control for Islanded Microgrid with Communication Delays 7

Consensus-based Secondary Frequency Control for Islanded Mic...

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7th International Conference on Control Automation and Information Sciences (ICCAIS)

作者： Cai, Pengcheng Wen, Chuanbo Song, Changju Shanghai Dian Ji Univ Coll Elect Engn Shanghai 201306 Peoples R China

ISBN: (纸本)9781538660201

In this paper, a distributed control strategy based on consensus algorithm is proposed to deal with the secondary frequency control problem for islanded AC microgrid. The proposed strategy allows the active power set points of each distributed generator (DG) unit to be updated in the presence of time-varying bounded communication delays in the distributed communication network, thereby restoring the average frequency of the system to a reference value. In order to further reduce the communication burden, an event-driven control method is adopted, that is, the proposed strategy is started only when the system frequency deviation is excessive. Compared with the traditional control method, the proposed strategy only needs the information of the DG itself and its neighbors to achieve the control target, eliminating the need for the microgrid central controller (MGCC) and improving the reliability and flexibility of the system. Simulation results validate the effectiveness of our proposed control strategy.

关键词： distributed control consensus algorithm islanded microgrids distributed generator (DG) communication delays

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consensus-based Data Statistics in Distributed Network Systems 57

Consensus-based Data Statistics in Distributed Network Syste...

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57th IEEE Conference on Decision and Control (CDC)

作者： Cai, Yifan He, Jianping Yu, Wenbin Guan, Xinping Shanghai Jiao Tong Univ Sch Software Engn Shanghai Peoples R China Shanghai Jiao Tong Univ Dept Automat Shanghai Peoples R China Minist Educ China Key Lab Syst Control & Informat Proc Shanghai Peoples R China

ISBN: (纸本)9781538613955

Data has become increasingly important in network systems because a lot of data is needed in new technologies such as machine learning. To obtain statistics (e.g. maximum, average, and distribution) in a fully distributed way with low complexity is challenging. Existing research on consensus algorithms can successfully obtain the max/min, average and median in a distributed network, but little work has been done on how to compute other statistics, especially probability density function (PDF). In this paper, consensus-based algorithms are proposed to obtain PDF in a fully distributed way with low complexity. The key idea of our algorithms is to divide the range of nodes' values into several sections and calculate the proportions of values in each section in a fully distributed way. If nodes have their unique identifications (IDs), repeatedly run max/min consensus algorithm in the network to reach the partially max/min values and then erase them in order to reach all values exactly once. We prove that the algorithm converges infinite time. When nodes' IDs are not available, the main challenge is to solve the conflicts when two or more nodes have the same value. We propose an asymptotically converged algorithm to solve the problem in this scenario.

关键词： consensus algorithm Distributed databases Probability density function Computational modeling Network topology Topology Protocols

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