检索结果-内蒙古大学图书馆

Load predictions: vulnerability of micro-grids based on renewable energies due to increasing population and individual demand

引用

IET RENEWABLE POWER GENERATION 2020年第8期14卷 1312-1320页

作者： Kuehnel, Meike Ravanbach, Babak Hanke, Benedikt Weigel, Olga Stuermer, Ingo W. McMaster, Alister Maebe, Sander von Maydell, Karsten DLR Inst Networked Energy Syst Carl von Ossietzky Str D-26129 Oldenburg Germany Deutsch Gesell Int Zusammenarbeit GIZ GmbH Hamburg Germany Lower Saxony Minist Environm Affairs Energy Bldg Hannover Germany Dept Econ Dev Environm Affairs & Tourism Eastern East London South Africa Deutsch Gesell Int Zusammenarbeit GIZ GmbH East London South Africa

Small-scale systems are vulnerable to changes. The development of solution strategies for changing conditions should, therefore, be considered from the outset in planning. For planners and installers of mini-grids for rural villages without grid connection, first of all, the question of the expected electricity demand arises. So far, this is determined primarily by interviewing the population. However, studies have shown that there are still major differences between the power demand estimated and the real load after electrification. Reinforcing here is the inadequate assessment of load development through immigration and increased prosperity. On the basis of a currently developing mini-grid in the Eastern Cape of South Africa, we could show that a load increase of similar to 60% within 10 years is to be expected. The following possibilities were outlined as possible ways of counteracting the increase in load: (i) communicating with the population, i.e. on energy efficiency to raise awareness and understanding, (ii) early planning of capacity building and identification of key performance parameters to trigger the expansion based on local socio-cultural conditions and grid supporting qualities. An adequate database for the initial electrification and power development should also be established and available on open-source basis for researchers, developers, communities, and installers.

关键词： socio-economic effects distributed power generation renewable energy sources power grids power generation planning energy conservation load predictions microgrid vulnerability renewable energies small-scale systems rural villages grid connection expected electricity demand load development minigrid Eastern Cape South Africa energy efficiency local socio-cultural conditions power development capacity building planning key performance parameter identification grid supporting qualities open-source basis time 10 0 year

来源：评论

学校读者我要写书评

暂无评论

Multi-level Method of Behavioral Online Testing of distributed Information systems 10

Multi-level Method of Behavioral Online Testing of Distribut...

引用

10th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing systems - Technology and Applications (IDAACS)

作者： Martynyuk, Oleksandr Drozd, Oleksandr Stepova, Hanna Martynyuk, Dmitry Odessa Natl Polytech Univ Shevchenko Ave 1 UA-65044 Odessa Ukraine

ISBN: (纸本)9781728140698

systems for automated technical diagnostics of promising complex distributed information systems, often with critical properties of application, as well as actively added agent properties of autonomy, mobility, intelligence, and cooperativity, should ensure their complete real-time testing. Moreover, the online testing should be carried out both for the static hardware-software and information environment of the system location, and for the dynamic aggregate of information-check flows corresponding to the main functions and scenarios of its work. This paper discusses a multi-level method of behavioral online testing, based on a multi-level model for check of behavior of hierarchical Petri nets. The check model allows us to present both the active processes of the basic functioning of the static environment for placing distributed information systems and dynamic information and control flows in it, as well as passive processes of behavioral online testing of the environment and flows. The proposed online testing method differs in the background hierarchical organization of the temporal development of processes and check flows with evolutionary optimization based on multi-agent organization and space-time decomposition and distribution in the hosting environment. The behavioral online testing method allows defining the main verification procedures and its preparation, reducing the time and resources costs due to the evolutionary search and multi-agent decomposition of the control analysis, which is important for real-time verification.

关键词： behavioral online testing identifier check primitive evolution system multi-agent system

来源：评论

学校读者我要写书评

暂无评论

Scalable Triangle Counting on distributed-Memory systems

Scalable Triangle Counting on Distributed-Memory Systems

引用

IEEE High Performance Extreme Computing Conference (HPEC)

作者： Acer, Seher Yasar, Abdurrahman Rajamanickam, Sivasankaran Wolf, Michael Catalyurek, Umit V. Sandia Natl Labs Ctr Comp Res POB 5800 Albuquerque NM 87185 USA Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)9781728150208

Triangle counting is a foundational graph-analysis kernel in network science. It has also been one of the challenge problems for the "Static Graph Challenge". In this work, we propose a novel, hybrid, parallel triangle counting algorithm based on its linear algebra formulation. Our framework uses MPI and Cilk to exploit the benefits of distributed-memory and shared-memory parallelism, respectively. The problem is partitioned among MPI processes using a two-dimensional (2D) Cartesian block partitioning. One-dimensional (1D) row-wise partitioning is used within the Cartesian blocks for shared-memory parallelism using the Cilk programming model. Besides exhibiting very good strong scaling behavior in almost all tested graphs, our algorithm achieves the fastest time on the 1.4B edge real-world twitter graph, which is 3.217 seconds, on 1,092 cores. In comparison to past distributed-memory parallel winners of the graph challenge, we demonstrate a speed up of 2.7x on this twitter graph. This is also the fastest time reported for parallel triangle counting on the twitter graph when the graph is not replicated.

关键词： triangle counting distributed-memory systems scale-free graphs two-dimensional partitioning

来源：评论

学校读者我要写书评

暂无评论

ODRE workshop: Probabilistic Dynamic Hard real-time Scheduling in HPC

ODRE Workshop: Probabilistic Dynamic Hard Real-Time Scheduli...

引用

International Symposium on Object-Oriented real-time distributed Computing

作者： Florian Hofer Martin A. Sehr Barbara Russo Alberto Sangiovanni-Vincentelli Faculty of Computer Science Free University of Bolzano-Bozen Bolzano Italy Siemens Corporation Corporate Technology Berkeley CA USA EECS Department University of California Berkeley CA USA

ISBN: (数字)9781728169583

ISBN: (纸本)9781728169590

Industry 4.0 is changing fundamentally the way data is collected, stored and analyzed in industrial processes. While this change enables novel application such as flexible manufacturing of highly customized products, the real-time control of these processes, however, has not yet realized its full potential. We believe that modern virtualization techniques, specifically application containers, present a unique opportunity to decouple control functionality from associated hardware. Through it, we can fully realize the potential for highly distributed and transferable industrial processes even with real-time constraints arising from time-critical sub-processes. In this paper, we present a specifically developed orchestration tool to manage the challenges and opportunities of shifting industrial control software from dedicated hardware to bare-metal servers or (edge) cloud computing platforms. Using off-the-shelf technology, the proposed tool can manage the execution of containerized applications on shared resources without compromising hard real-time execution determinism. Through first experimental results, we confirm the viability and analyzed the behavior of resource shared systems with strict real-time requirements. We then describe experiments set out to deliver expected results and gather performance, application scope and limits of the presented approach.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Transactive-based control algorithm for real-time energy imbalance minimisation in microgrids

Transactive-based control algorithm for real-time energy imb...

引用

CIRED 2020 Berlin workshop (CIRED 2020)

作者： Sajjad Fattaheian-Dehkordi Mohammad Jooshaki Ali Abbaspour Mahmud Fotuhi-Firuzabad Matti Lehtonen Aalto University Department of Electrical Engineering and Automation Helsinki Finland Sharif University of Technology Department of Electrical Engineering Tehran Iran

Modern power systems would compose of networked microgrids (MGs) operating independently. Respectively, MGs’ control units (MCUs) are responsible for optimising the operation of independent agents associated with local resources to maximise the social welfare of the system. In this regard, agents schedule their respective resources with the aim of maximising their profits; while MCU as a mediator entity strives to facilitate the flexibility of service exchange among the agents. In MGs, renewable energy sources (RESs) as potential sources of energy confront with uncertainty originated from their dependence on meteorological resources. Consequently, MGs would confront energy imbalance in real time as a result of probable inaccuracies corresponding with forecasting the power production of RESs in the day-ahead market. To tackle this issue, a transactive-based framework is developed in this study that enables MCUs to incentivise the cooperation of agents scheduling flexible resources in minimising energy imbalances in real time. Correspondingly, MCU offers bonuses as transactive signals to local agents to contribute in minimising the energy imbalance; which consequently results in improving the MG flexibility. Finally, the developed framework is implemented on an MG composed of independent agents scheduling flexible resources to investigate its effectiveness in minimising the energy imbalance in MGs.

关键词： distributed power generation power generation control real-time systems power generation scheduling

来源：评论

学校读者我要写书评

暂无评论

基于并行计算的抛光轴表面缺陷检测研究

引用

机电工程 2020年第12期37卷 1540-1546页

作者：姜庆胜李研彪计时鸣浙江工业大学机械工程学院浙江杭州310023

针对在生产实践中抛光轴表面缺陷检测的实时性和缺陷分类需求问题,对抛光轴表面缺陷检测系统、缺陷图像采集、图像特征、传统检测方法等方面进行了研究,归纳了轴表面缺陷检测的处理方法。提出了两种基于并行计算的检测系统,即基于云的Sp... 详细信息

针对在生产实践中抛光轴表面缺陷检测的实时性和缺陷分类需求问题,对抛光轴表面缺陷检测系统、缺陷图像采集、图像特征、传统检测方法等方面进行了研究,归纳了轴表面缺陷检测的处理方法。提出了两种基于并行计算的检测系统,即基于云的Spark多机并行的分布式计算机集群检测系统和单机多核的CUDA并行处理检测系统;通过Spark架构多机分布式并行计算机理的分析,以及结合CUDA单机多核并行运算原理,从数学角度进行了并行化处理,最后进行了相应的实验。研究结果表明:基于CUDA的单机多核的并行处理检测系统适合实时检测,基于Spark的多机分布式并行检测系统不适合实时检测系统,但适合大数据处理系统。

关键词：图像处理 Spark 分布式并行计算图像处理单元 CUDA

来源：评论

学校读者我要写书评

暂无评论

板材切割车间设备联网管控方案分析

引用

船舶标准化工程师 2023年第6期56卷 17-21页

作者：侯星刘玉玺董家琛张则青郭威张怡敏上海船舶工艺研究所上海200032 上海申博信息系统工程有限公司上海200032 海洋石油工程股份有限公司天津300461

为了实现上部模块制造过程中对板材、型材切割状态的实时监控,对切割车间设备数据联网的4项关键技术进行分析,基于实际案例提出2种切割机联网方案:方案1采用外接数据采集卡的方式;方案2基于切割机的分布式数控接口获取与硬件相关的信息... 详细信息

为了实现上部模块制造过程中对板材、型材切割状态的实时监控,对切割车间设备数据联网的4项关键技术进行分析,基于实际案例提出2种切割机联网方案:方案1采用外接数据采集卡的方式;方案2基于切割机的分布式数控接口获取与硬件相关的信息。2种方案均能通过局域网与车间制造执行管控系统进行数据交互,通过外接数据采集卡及相应传感器自动接收设备运行状态信息及反馈生产数据,通过中控室计算机同时监控多台数控切割设备,直观形象地显示设备状态、当前加工任务、工作人员等电子信息,实现切割设备的联网管控。

关键词：板材切割车间联网管控数据采集

来源：评论

学校读者我要写书评

暂无评论

The Cooperative parallel: A Discussion About Run-time Schedulers for Nested parallelism 15th

The Cooperative Parallel: A Discussion About Run-Time Schedu...

引用

15th International workshop on OpenMP (IWOMP)

作者： Royuela, Sara Serrano, Maria A. Garcia-Gasulla, Marta Bellido, Sergi Mateo Labarta, Jesus Quinones, Eduardo Barcelona Supercomp Ctr Barcelona Spain

ISBN: (纸本)9783030285968;9783030285951

Nested parallelism is a well-known parallelization strategy to exploit irregular parallelism in HPC applications. This strategy also fits in critical real-time embedded systems, composed of a set of concurrent functionalities. In this case, nested parallelism can be used to further exploit the parallelism of each functionality. However, current run-time implementations of nested parallelism can produce inefficiencies and load imbalance. Moreover, in critical real-time embedded systems, it may lead to incorrect executions due to, for instance, a work non-conserving scheduler. In both cases, the reason is that the teams of OpenMP threads are a black-box for the scheduler, i.e., the scheduler that assigns OpenMP threads and tasks to the set of available computing resources is agnostic to the internal execution of each team. This paper proposes a new run-time scheduler that considers dynamic information of the OpenMP threads and tasks running within several concurrent teams, i.e., concurrent parallel regions. This information may include the existence of OpenMP threads waiting in a barrier and the priority of tasks ready to execute. By making the concurrent parallel regions to cooperate, the shared computing resources can be better controlled and a work conserving and priority driven scheduler can be guaranteed.

关键词： Resource allocation Concurrency Runtime scheduler

来源：评论

学校读者我要写书评

暂无评论

distributed coordination control strategy for multiple residential solar PV systems in distribution networks

引用

INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY systems 2020年第0期117卷 105660-000页

作者： Cheng, Zhiping Li, Zhongwen Liang, Jing Si, Jikai Dong, Lianghui Gao, Jinfeng Zhengzhou Univ Sch Elect Engn Zhengzhou 450001 Peoples R China

distributed rooftop PV generator systems have been increasing significantly in distribution networks. However, due to the intermittent nature of the PV power generation, it is challenging to handle the fast voltage variation of the distribution system through dispatching traditional low response speed devices such as load tap changers and capacitor banks. In this paper, a distributed hierarchical control strategy is proposed to deal with the voltage fluctuation issues through real-time regulating the injection or consumption reactive power of the fast response PV inverters. The proposed control strategy includes a primary droop control level and an agent-based distributed secondary control level. The droop-based primary level control can quickly regulate the voltage of PV inverter with locally measured information to overcome the fast voltage variation. The agent-based secondary level control can guarantee the average bus voltage restoration and proportionally reactive power sharing among the PV inverters through distributed communication between neighboring agents. With the proposed control strategy, both the average bus voltage restoration and proportionally reactive power sharing can be satisfied, which improves the stability of the distribution system. Furthermore, the proposed strategy is a fully distributed method that can distribute the computational and communication tasks among the local controllers through working in parallel, which is more flexible, scalable, and insusceptible to single-point failure.

关键词： Solar PV systems distributed coordination control Distribution networks Reactive power dispatch Voltage variation Multi-agent system

来源：评论

学校读者我要写书评

暂无评论

distributed Data Processing Platform for Constructive Simulation

Distributed Data Processing Platform for Constructive Simula...

引用

作者： 배민수 Seoul National University

Since the emergence of the fourth industrial revolution, data analysis is being conducted in various fields. distributed data processing has already become essential for the fast processing of large amounts of data. However, in the defense sector, simulation used cannot fully utilize the unstructured data which are prevailing at real environments. At the Korea Combat Training Center (KCTC), training unit conducts battles for two consecutive days and nights, resulting in about 300GB of voice, video, and engagement data. If the information stored as unstructured data can be analyzed and presented as visual evidence, it can affect the commands decision in response to the problems faced in the field during training. To this end, we propose a distributed data processing platform. In the military, Adaptive distributed parallel Simulation environment for Interoperable and reusable Models (AddSIM) has been developed to link data utilization with combat training programs. To overcome the issue of data utilization, several simulations are duplicated in a single program, and relevant results are obtained. However, in the case of AddSIM, the conditions for utilizing various weapon systems must be established simultaneously. If a corps is small, the model is limited. In this study, we propose a distributed data processing platform that can be applied to battalion level simulation models to provide visualized data for command decisions during training. The proposed distributed data processing platform is composed of two layers - the App layer and the System layer. In the App layer, a remote function is delivered to all workers and the worker receiving the task executes it. The driver submits the remote function to the local scheduler, following which the function gets forwarded to the global scheduler. The workers receive the task from the scheduler. At this time, the objects and functions stored in the global control store corresponding to the system layer can be shared in the w

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：