MicroGrid Designer:user-friendly design,operation and control assist tools for resilient microgrid and autonomous community

During this decade,many countries have experienced natural and accidental disasters,such as typhoons,floods,earthquakes,and nuclear plant accidents,causing catastrophic damage to infrastructures.Since the end of 2019,all countries of the world are struggling with the COVID-19 and pursuing countermeasures,including inoculation of vaccine,and changes in our lifestyle and social structures.All these experiences have made the residents in the affected regions keenly aware of the need for new infrastructures that are resilient and autonomous,so that vital lifelines are secured during calamities.A paradigm shift has been taking place toward reorganizing the energy social service management in many countries,including Japan,by effective use of sustainable energy and new supply schemes.However,such new power sources and supply schemes would affect the power grid through intermittency of power output and the deterioration of power quality and service.Therefore,new social infrastructures and novel management systems to supply energy and social service will be required.In this paper,user-friendly design,operation and control assist tools for resilient microgrids and autonomous communities are proposed and applied to the standard microgrid to verify its effectiveness and performance.

Conflict Resolution Based on Collaborative Design of Grid Services

To the issues of low efficiency of conflict resolution method in collaborative design, we proposed a method, which is conflict resolution about collaborative design based on grid services.It uses the grid services from the current design points, uses the method of retrospective thinking to find the conflict point by detecting, and then uses the corresponding method to resolve the conflict point according to the conflict characteristic, after that carried on the conflict detection again. If there is still the conflict, resolve the conflict point again, until the conflict no longer exists. This method combines various traditional resolution methods, makes full use of the grid idle high-performance large-scale sharing resources. With this method the collaborative design conflict resolution cost reduced and the conflict resolution efficiency was raised. And then the problem which is not handled completely was then solved, so that the conflict resolution Quality was guaranteed.

Study on solder joint reliability of ceramic ball grid array component based on design of experiment method

Four process parameters, pad diameter, stencil thickness, ball diameter and stand-off were chosen as four control factors. By using an L25 （5^6 ） orthogonal array the ceramic ball grid array （ CBGA ） solder joints which have 25 different combinations of process parameters were designed. The numerical models of all the 25 CBGA solder joints were developed using the Sugrace Evolver. Utilizing the sugrace coordinate exported from the 25 CBGA solder joints numerical models, the finite element analysis models were set up and the nonlinear finite element analysis of the CBGA solder joints under thermal cycles were pegrormed by ANSYS. The thermal fatigue life of CBGA solder joint was calculated using Coffin-Manson equation. Based on the calculated thermal fatigue life results, the range analysis and the variance analysis were pegrormed. The results show that the fatigue life of CBGA solder joint is affected by the pad diameter, the stencil thickness, the ball diameter and the stand-off in a descending order, the best combination of process parameters results in the longest fatigue life is 0.07 mm stand-off, 0.125 mm stencil thickness of, 0.85 mm ball diameter and 0. 89 mm pad diameter. With 95% confidence the pad diameter has a significant effect on the reliability of CBGA solder joints whereas the stand-off, the stencil thickness and the ball diameter have little effect on the reliability of CBGA solder joints.

Evaluation of Moving Grid Adjustment (MGA) Method in Field Variation Control

Spatial variation is often encountered when large scale field trials are conducted which can result in biased estimation or prediction of treatment (i.e. genotype) values. An effective removal of spatial variation is needed to ensure unbiased estimation or prediction and thus increase the accuracy of field data evaluation. A moving grid adjustment (MGA) method, which was proposed by Technow, was evaluated through Monte Carlo simulation for its statistical properties regarding field spatial variation control. Our simulation results showed that the MGA method can effectively account for field spatial variation if it does exist;however, this method will not change phenotype results if field spatial variation does not exist. The MGA method was applied to a large-scale cotton field trial data set with two representative agronomic traits: lint yield (strong field spatial pattern) and lint percentage (no field spatial pattern). The results suggested that the MGA method was able to effectively separate the spatial variation including blocking effects from random error variation for lint yield while the adjusted data remained almost identical to the original phenotypic data. With application of the MGA method, the estimated variance for residuals was significantly reduced (62.2% decrease) for lint yield while more genetic variation (29.7% increase) was detected compared to the original data analysis subject to the conventional randomized complete block design analysis. On the other hand, the results were almost identical for lint percentage with and without the application of the MGA method. Therefore, the MGA method can be a useful addition to enhance data analysis when field spatial pattern exists.

分布式CAD-Grid集成系统平台的设计与实现

从系统实施模式、体系结构和功能模块等方面讨论了构建分布式同步协同CAD-Grid系统的基本理论和方法,展现了一个新的基于网格技术的分布式协同CAD系统环境。利用软件代理实现网格计算中间件,解决了异构计算平台下多种并行编程环境的协同计算问题,为用户提供统一的服务接口。实例表明,该系统具有完全的跨平台性、可扩展性和开放性,足以支持人机环境下协同动态工作和资源共享。

基于特征实体造型的CAD-Grid分布式系统的实现

创新性地设计了一个基于特征实体造型的CAD-Grid分布式系统(CGDS)的框架。展现了一个新的基于网格技术的分布式协同CAD系统环境,该系统平台以通用网络为基础,以各种CAD设计资源为结点,以网格平台中间件GlobusToolkit3.0为桥梁,整合了由网络服务实现的任务动态调度、分布式执行的机制,实现资源共享、协同设计,加快了CAD实体建模。通过实例验证了系统的可行性和可操作性。实验证明,并非节点数越多越好,只有当节点数与零件图个数遵循Amdahls法则时,其加数比和效率达到最佳值。

Comparative Analysis of Equal and Unequal Grounding Grid Configurations by Compression Ratio and Least Square Curve Fitting Techniques

The primary aim of the power system grounding is to safeguard the person and satisfying the performance of the power systemtomaintain reliable operation.With equal conductor spacing grounding grid design,the distribution of the current in the grid is not uniform.Hence,unequal grid conductor span in which grid conductors are concentrated more at the periphery is safer to practice than equal spacing.This paper presents the comparative analysis of two novel techniques that create unequal spacing among the grid conductors:the least-square curve fitting technique and the compression ratio techniquewith equal grid configuration for both square and rectangular grids.Particle Swarm Optimization(PSO)is adopted for finding out one optimal feasible solution among many feasible solutions of equal grid configuration for both square and rectangular grids.Comparative analysis is also carried out between square and rectangular grids using the least square curve fitting technique as it results in only one unequal grid configuration.Simulation results are obtained by theMATLAB software developed.Percentage of improvement in ground potential rise,step voltage,touch voltage,and grid resistancewith variation in compression ratios are plotted.

求解Overlay Grid拓扑问题的模拟退火算法

针对网格开放性和扩展性的需求,提出了基于Overlay Network网格体系结构的理论模型。形式化了其核心问题:混合Overlay Network拓扑设计问题,证明了该问题在满足一定条件下具有线性复杂度,提出了在一般条件下求解该问题的模拟退火算法。最后,通过仿真实验分析评价了所提出算法对Overlay Network拓扑代价的影响,结果表明这个模拟退火算法是可行的。

GridSim网格仿真工具扩展及在教学实验中的应用

GridSim网格仿真工具为网格调度策略的仿真提供了基本的程序开发接口,但它并没有提供交互式的图形界面以及数据管理功能。采用Standard Widget Toolkit（SWT）图形接口编程方法,基于GridSim设计,实现了具有交互式图形界面的网格仿真工具。扩展后的网格仿真工具具有数据管理功能,可将实验环境定义数据、实验过程数据、实验结果数据以及实验分析数据统一管理起来。该仿真工具为学生学习计算机算法设计和实践提供了一个方便、灵活的实验平台,提高了教学实验的效果。

基于Design Explorer网格优化的曲面气浮承载能力的研究

目前静压气浮轴承通常采用跨立式组合支撑技术来满足应用需求,但该支撑技术存在着如供气调节复杂,结构不紧凑等一系列固有问题制约着该支撑技术的使用效果。基于此,在对跨立式支撑系统进行分析后,针对其可以改进之处提出了曲面气浮支承系统。借助FLUENT与Design Explorer模块的参数化设计功能,对该类问题的数值模拟精度提出了解决方案。求得了设计参数对于该支撑系统承载力的影响。得出新式网格无关性数值模拟实验有助于提高数值模拟的计算精度。

Grid++Report报表在考核信息管理系统中的应用

信息管理系统的开发中,报表的动态生成是个棘手问题。该文阐述了运用C#编程技术,后台数据由SQL Server 2008统一管理,选用Grid++Report报表工具,实现了快速开发客户端报表的功能。

The Study of SMT Product Manufacturing Grid System

Surface mount technology product manufacturing grid(SMT-MG) is a typical application which grid technology was applied to SMT product manufacturing.In this paper,for SMT-MG system,conception and intension of SMT-MG were analyzed.Then six-layer architecture of SMT-MG was constructed and mesh three-dimensional matrix organization mode of SMT-MG was studied.Operation mechanism of SMT-MG was discussed emphatically which include adaptive evolution mechanism,PUSH/PULL driving mechanism,cooperation game mechanism,feedback,regulation and control mechanism,coordination mechanism and impetus mechanism.The study of SMT-MG must be useful for developing of electronic product manufacturing.

在VisualFoxpro表单中Grid控件的设置技巧

本文从记录的着色处理、删除记录及记录指针的移位等方面,详细阐述在VisualFoxpro(下称VFP)表单设置 中Grid表控件的设置技巧和应注意的事项。

Determination of optimal grid opening width for herringbone water-sediment separation structures based on sediment separation efficiency

The herringbone water-sediment separation structure(HWSSS) was developed to prevent debris flows. This paper mainly focuses on evaluating the sediment separation efficiency of HWSSS in debris flow prevention and determining the grid opening width D, a crucial structure parameter for HWSSS design. Theoretical analysis on the total sediment separation rate Pt reveals that the efficiency of sediment separation is much related with sediment grain size distribution(GSD) and grid opening width. The lower limit of Pt is deduced from the perspective of safety consideration by transforming debris flow into sediment-laden flow. Hydraulic model tests were carried out. Based on the regression analysis of the experimental data, the quantitative relationships between Pt and D and GSD characteristic values were finally established. A procedure for determining optimal grid opening width is proposed based on these analyses. These results are of significance in evaluating sediment separation effect by HWSSS in debris flow prevention and contribute to a more explicit methodology for design of HWSSS.

Improved algorithmic mechanism based on game theory in computational grids

Computational grids （CGs） aim to offer pervasive access to a diverse collection of geographically distributed resources owned by different serf-interested agents or organizations. These agents may manipulate the resource allocation algorithm in their own benefit, and their selfish behavior may lead to severe performance degradation and poor efficiency. In this paper, game theory is introduced to solve the problem of barging for resource collection in heterogeneous distributed systems. By using the Cournot model that is an important model in static and complete information games, the algorithm is optimized in order to maximize the benefit. It can be seen that the approach is more suitable to the real situation and has practical use. Validity of the solutions is shown.

Treatment design of geological defects in dam foundation of Jinping I hydropower station

Jinping I hydropower station is one of the most challenging projects in China due to its highest arch dam and complex geological conditions for construction.After geological investigation into the dam foundation,a few large-scale weak discontinuities are observed.The rock masses in the left dam foundation are intensively unloaded,approximately to the depth of 150–300 m.These serious geological defects lead to a geological asymmetry on the left and right banks,and thus some major diffculties of dam construction are encountered.In this paper,the influences of geological defects on the project are analyzed,followed by the concepts and methods of treatment design.Based on the analysis,the treatment methods of the weak rock masses and discontinuities are carefully determined,including the concrete cushion,concrete replacement grids,and consolidation grouting.They work together to enhance the strength and integrity of the dam foundation.Evaluations and calibrations through geo-mechanical model tests in combination with feld monitoring results in early impoundment period show that the arch dam and its foundation are roughly stable,suggesting that the treatment designs are reasonable and effective.The proposed treatment methods and concepts in the context can be helpful for similar complex rock projects.

斜列式机动车库平面柱网设计研究--以60°斜列式停车方式为例

该文以60°斜列式停车方式为例,研究斜列式机动车库的平面柱网设计规律:包括框架柱的截面形状与尺寸、柱网开间尺寸、柱网开间中的停车位数量、进深方向的柱网尺寸、柱网与停车位的关系、无障碍停车位等方面内容。并按照独立式车库和附建式车库两种类型给出不同的设计意见。将60°斜列式停车方式与实际工程项目中普遍采用的垂直式停车方式进行比较,分析其不同适用场所。以期丰富机动车库的设计方法,提高机动车库的设计质量。

6082-T6铝合金构件及其超大跨空间结构的受力性能与设计方法

针对6082-T6铝合金,从材料力学性能、轴压与偏压构件稳定承载力、受弯构件受力性能方面进行了系统试验和数值仿真研究;建立了国产铝合金构件试验数据库,评估了中、欧、美规范及DSM、CSM共5种设计方法的可靠度水平;对6082-T6铝合金圆管及泡沫铝填充复合管开展侧向冲击试验与数值仿真研究,提出了构件动态响应计算方法,并建立了冲击下构件变形的预测方法;针对超大跨度铝合金巨型网格结构开展了探索性研究,提出了适用于超大跨度结构的新型节点形式及稳定受力性能分析。研究成果将对6082-T6铝合金构件及结构在工程中的推广应用、提升结构的承载与抗冲击防御能力提供依据与技术支撑。

基于网格划分的老城区公园景观组合设计方法

为了提高景观配置效率,提出基于网格划分的老城区公园景观建设组合设计方法.数字影像内定向原始景观图像以生成正射影像模型,通过梯度分解提取边缘信息完成图像采样.结合空间区域特征匹配方程优化提取多维度景观数据,构建多维度景观图像的动态特征分布模型,在此基础上划分景观区域网格,并结合景观特征属性解析结果实现景观建设组合设计.通过城市公园的景观设计表明,所提方法能够有效提高景观配置效率,景观设计的规划效果较好.

基于数字孪生模型的数字化电网能耗自动监测系统研究

当前使用的数字化电网中,存在感知终端种类较多,对于传统的能耗自动监测系统来说获取的数据传输实时性不足,导致监测结果出现偏差,为此设计一种基于数字孪生模型的数字化电网能耗自动监测系统。系统主要从硬件和软件两方面进行设计:在硬件设计中,根据不同的应用层次,设计系统的总体架构。主要对硬件中的无线通信网络进行搭建,选择基于LoRa无线通信技术的RTU设备作为通信主体。设计LoRa无线开关电路,实现ZigBee设备之间的无线数据传输和交换;软件设计中,设计能耗数据采集主线程,分析数字孪生模型映射交互关系,基于数字孪生模型与实际运行工况之间的映射关系实现能耗指标实时监测。实验结果表明,与传统系统相比,设计得到的检测结果与实际的能耗情况更加相符。