Hybrid Simulation of ±500 kV HVDC Power Transmission Project Based on Advanced Digital Power System Simulator

In order to effectively imitate the dynamic operation characteristics of the HVDC （high voltage direct current） power transmission system at a real ±500kV HVDC transmission project, the electromechanical-electromagnetic transient hybrid simulation was carried out based on advanced digital power system simulator （ADPSS）. In the simulation analysis, the built hybrid model＇s dynamic response outputs under three different fault conditions are considered, and by comparing with the selected fault recording waveforms, the validities of the simulation waveforms are estimated qualitatively. It can be ascertained that the hybrid simulation model has the ability to describe the HVDC system＇s dynamic change trends well under some special fault conditions.

Numerical simulation of non-Archie electrophysical property of saturated rock with lattice Boltzmann method

The electrophysical property of saturated rocks is very important for reservoir identification and evaluation. In this paper, the lattice Boltzmann method （LBM） was used to study the electrophysical property of rock saturated with fluid because of its advantages over conventional numerical approaches in handling complex pore geometry and boundary conditions. The digital core model was constructed through the accumulation of matrix grains based on their radius distribution obtained by the measurements of core samples. The flow of electrical current through the core model saturated with oil and water was simulated on the mesoscopic scale to reveal the non-Archie relationship between resistivity index and water saturation （I-Sw）. The results from LBM simulation and laboratory measurements demonstrated that the I-Sw relation in the range of low water saturation was generally not a straight line in the log-log coordinates as described by the Archie equation. We thus developed a new equation based on numerical simulation and physical experiments. This new equation was used to fit the data from laboratory core measurements and previously published data. Determination of fluid saturation and reservoir evaluation could be significantly improved by using the new equation.

We Are Living in a Computer Simulation

This paper posits that we are living in a computer simulation to simulate physical reality which has the same computer simulation process as virtual reality (computer-simulated reality). The computer simulation process involves the digital representation of data, the mathematical computation of the digitized data in geometric formation and transformation in space-time, and the selective retention of events in a narrative. Conventional physics cannot explain physical reality clearly, while computer-simulated physics can explain physical reality clearly by using the computer simulation process consisting of the digital representation component, the mathematical computation component, and the selective retention component. For the digital representation component, the three intrinsic data (properties) are rest mass-kinetic energy, electric charge, and spin which are represented by the digital space structure, the digital spin, and the digital electric charge, respectively. The digital representations of rest mass and kinetic energy are 1 as attachment space for the space of matter and 0 as detachment space for the zero-space of matter, respectively, to explain the Higgs field, the reverse Higgs field, quantum mechanics, special relativity, force fields, dark matter, and baryonic matter. The digital representations of the exclusive and the inclusive occupations of positions are 1/2 spin fermion and integer spin boson, respectively, to explain spatial translation by supersymmetry transformation and dark energy. The digital representations of the allowance and the disallowance of irreversible kinetic energy are integral electric charges and fractional electric charges, respectively, to explain the confinements of quarks and quasiparticles. For the mathematical computation component, the mathematical computation involves the reversible multiverse and oscillating M-theory as oscillating membrane-string-particle whose space-time dimension (D) number oscillates between 11D and 10D and between 10D and 4D to explain cosmology. For the selective retention component, gravity, the strong force, electromagnetism, and the weak force are the retained events during the reversible four-stage evolution of our universe, and are unified by the common narrative of the evolution.

Ontology-Based Semantic Multi-agent Framework for Micro-grids with Cyber Physical Concept

The distributed hierarchical control based on multi-agent system(MAS) is the main control method of micro-grids.By allowing more flexible interactions between computing components and their physical environments,cyber physical system(CPS) presents a new approach for the distributed hierarchical engineering system,with micro-grids included.The object of this paper is to integrate the CPS concept with MAS technology and propose a new control framework for micro-grids.With the analysis of the operating mode and control method of micro-grids,the cyber physical control concepts of ontologybased semantic agent are discussed.Then an MAS-based architecture of cyber physical micro-grid system and an intelligent electronic device(IED) function structure are proposed.Finally,in order to operate and test the cyber physical micro-grid concept,an integrated simulation model is presented.

基于Simulink实现的数模混合控制系统仿真新方法

提出了一种采用Simulink实现数模混合控制系统的仿真方法。控制系统中实际的被控对象用连续Simulink模块构建的非线性连续系统来描述,同时采用Simulink模块与M函数相结合的形式,用信号上升沿触发子系统模拟闭环控制系统中的数字处理单元,即数字滤波与控制器部分,从而可真实地模拟周期性采集数据并处理数据的过程,最终实现数模混合控制系统的仿真。以连续搅拌反应釜基于卡尔曼滤波的状态反馈控制问题为实例,阐述了该仿真方法的具体实现过程。闭环仿真结果验证了该方法的有效性。

用于实时仿真的一类Hybrid方法

本文提出一类可用于实时数字仿真的Ｈｙｂｉｒｄ方法，对这类方法的基本理论作了分析，在Ｋ＝２时给出了具体的几组算法公式，数值试验结果表明这类实时算法是有效的、可行的。

基于Process Simulate的工业机器人信息物理融合系统

工业机器人在进行新工艺开发时一般存在周期长、调试复杂等常见问题。以ABB的IRB120型工业机器人作为研究对象,基于Process Simulate工业仿真平台,采用了工业机器人信息物理融合的方法,实现了工业机器人实体与虚拟模型深度融合的功能,通过数据的通信、采集与传输实现了二者的同步运动功能,进一步分析了虚拟模型相对于实体工业机器人的时间延迟误差。分析结果表明,二者的时间延迟误差在工业允许范围内,说明该技术可为智能制造提供有效的解决方案,可大幅缩短工艺开发周期、降低工艺开发成本,同时该技术也是数字孪生概念下的具体工程应用,技术本身具有较高的工程推广价值。

THEORETICAL AND EXPERIMENTAL STUDY ON THE PRESSURE AND VACUUM CONTINUOUS CONTROL SYSTEM BASED ON HYBRID PUMP

A novel pressure and vacuum continuous control system, which adopts a hybrid pump as pressure and vacuum source, is presented. The mathematical model of the system is developed. The theoretical simulation and analysis on the system are implemented in order to study the relationships among the characteristics, parameters and working points of the system. The experimental investigations on the system characteristics are presented with the adoption ofa fuzzy-PID controller. The simulation and experimental results indicate that the pressure and vacuum continuous control system based on hybrid pump has good dynamic and static performance, strong robustness and satisfactory adaptability to various system parameters. According to the results, system can successfully gain high accuracy and fast response signal. Also, the mathematical model of system is also testified by the experimental results.

风电机组运行动态数字孪生建模及半物理仿真

面向数字孪生技术所提出的精准映射与实时仿真需求,针对大型风电机组复杂非线性运行特性,提出了一种多输入-多输出(multi-input multi-output,MIMO)有限差分域-混合半机理(finite difference domain-hybrid semi-mechanical,FDD-HSM)数字孪生建模方法,建立了含物理控制器的风电机组数字孪生半物理仿真系统。推导机组集成动态MIMO-FDD-HSM模型结构;定义可表征机组运行工况的有限差分回归向量,完成全工况下有限差分空间紧致凸划分、参数模型辨识以及非参数模型训练;联合物理控制器搭建风电机组数字孪生仿真系统,开展硬件在环实时仿真。结果表明:该仿真系统具有高精度、实时逼近能力。

信息化视域下公共体育校本数字教育资源建设与应用研究——以高职院校为例

高职院校作为培养高素质技能型人才的重要基地,其公共体育教学也需要与时俱进,充分利用信息化手段提升教学质量和效果。该文以高职院校公共体育校本数字教育资源建设的重要性为切入点,构建了公共体育校本数字资源建设的具体内容:构建校本体育教学内容数字化教学资源库、开发在线学习平台、应用虚拟仿真技术、开发移动学习应用、加强教师培训与技术扶持、收集并分析数据。根据当前实际面临的问题,提出了普及与培训、合理利用数字化教学平台、灵活应用多媒体技术、应用推广虚拟现实技术、创新教学方法、完善评估与反馈方案等应用路径,期望高职院校可以逐步形成具有自身特色的公共体育校本数字教育资源体系,为提升体育教学质量和水平提供有力支撑。

嵌入式能量管理系统研制与工程实践

传统能量管理系统硬件组成复杂、设备接入成本高、扩展性及通用性弱,难以适配中小规模新兴场景的多能自主管控需求。为此,文中提出一种嵌入式能量管理系统。首先,基于混成控制理论提出控制组态技术,实现策略的通用开发;其次,基于自动微分开发边缘优化求解器,并结合嵌入式数据库、异步非阻塞通信技术构建轻量Web应用;最后,结合Simulink开展半实物仿真测试以验证控制的有效性。文中提出的嵌入式能量管理系统已在杭州亚运村世纪变电站和多个工业园区投入实际应用,交付周期显著缩短,部署成本降低50%以上,性能表现良好。

数字化教育背景下大学物理实验MOOC教学模式探索与实践

本文以北京科技大学“大学物理实验”教学为例,通过不断探索和教学反馈形成了数字化背景下大学物理实验MOOC教学模式;利用MOOC、仿真实验、实时数据后测系统、报告系统等线上手段最终形成了针对本校学生的线上异步SPOC课程与线下同步实验课程相结合的教学模式、线上线下混合式实验教学的操作模式。该操作模式有机融合了学生预习、交互式学习、操作个性化指导、数据检验、报告提交、线上答疑等各个方面,并实行过程性考核与结果性考核有机结合的多样评价和过程跟踪的考核方式,实现学生智慧学习的个性化、数字化和交互式,以此激发学生的学习兴趣和提高学习质量。此外,针对外校学生和社会学习者的MOOC与仿真结合的同步教学模式,行之有效,让实践课程可以突破校园边界,具有一定的推广价值。

面向冷链智能立体仓库的数字孪生系统构建

目的当前冷链物流行业立体仓库存在货品损耗率高、失温严重、信息化水平低等问题,确保冷链智能立体仓库的食品质量安全,并实现降本增效。方法面向冷链智能立体仓库的运行场景,设计全映射与多维仿真的数字孪生五维模型,通过对多源异构数据的融合,实现立体仓库全要素的状态实时可视化与监测预警,并提出一种支持系统联动决策的模型优化策略,对立体库负载与温控区热力分布进行智能调节,最大限度提高运行效率和降低运营成本。结果构建了一套冷链智能立体仓库数字孪生系统,通过对优化前后仓库运行数据进行对比,同等仓储环境条件下生鲜蔬菜的食品保鲜度损耗率同比下降了25%~30%,实现了冷链智能立体仓库实时数据与动态虚拟模型的精准映射与联动运转。结论以广东某供应链管理有限公司佛山智能冷链仓储物流中心的冷链立体仓库为实践对象,形成了冷链智能立体仓库一体化管控新模式。为冷链智能立体仓库运营管理、调度联动决策与协同作业提供了数字孪生技术的应用参考,为建立更完善的保鲜产品包装与冷链食品质量安全提供了新路径。

白鹤滩-江苏特高压混合级联直流工程数模仿真平台构建及特性研究

白(鹤滩)—江(苏)特高压直流输电工程是世界上第1个受端采用电网换相换流器(line-commutated converters,LCC)+模块化多电平换流器(modular multilevel converters,MMC)级联结构的实际工程,且受端分层接入4个交流馈入点。根据白江工程设计资料与实际参数,构建了包含与实际工程功能一致的MMC数字阀控系统、小步长现场可编程门阵列(field programmable gate array,FPGA)阀体仿真模型、直流实际控制保护装置的白江工程数模混合实时仿真平台,实现对白江工程百纳秒–微秒–毫秒级多时间尺度精准仿真。通过大量的功能性试验,以及与实际工程录波的一致性对比试验,验证了仿真平台的准确性;仿真分析了白江工程特殊结构和控制模式能在一定程度上提升对受端交流故障的抵御能力,可避免换相失败或降低换相失败的功率扰动,并改善受端故障引起送端交流过电压问题。本平台将继续应用于多回直流馈入华东的大电网数模混合仿真研究中。

基于数字孪生仿真的半导体可重入混合流水车间联合调度优化研究

在新一代信息技术与高端制造产业加速融合渗透的背景下,文中针对半导体车间订单动态到达、车间生产信息透明度低的问题,提出了一种基于数字孪生仿真的半导体可重入混合流水车间联合调度方法。首先,设计了一种基于AnyLogic的数字孪生仿真架构,并在此基础上构建了高保真数字孪生仿真模型,对多源异构数据虚实交互、多维多尺度孪生模型运行机理进行了深入探讨;其次,综合考虑最大完工时间、碳排放量和AGV利用率建立联合调度模型,提出了一种结合数字孪生的ENSGA-Ⅱ算法进行求解,并将其嵌入AnyLogic孪生模型实现实时调度;最后,基于差异化场景和半导体车间任务实例,验证了所提方法的有效性。

基于数-物模型混合交互反馈的结构近实时震害评估理论框架

科学合理的结构震害评估对于提升城市抗震韧性与运维智慧具有重要意义。针对韧性城市构建现阶段的实际需求与重要难题,面向“全域、动态、实时”的结构震害评估新范式,以基于数模的多模态特征融合和基于物模的多层次数值仿真模拟为理论架构的两大基本要素,依托深度学习、数字孪生、数物融合等新技术,提出了基于数-物模型混合交互反馈的结构近实时震害评估理论框架,并对该框架中的主要研究内容与关键科学问题进行了详细阐述。所提出的理论架构有望提升结构震害评估的实时性与智能性,助力推进韧性城市构建以及城市系统的智慧运维。

外置视觉监测的机器人数字孪生系统研究

目前,在直角坐标机器人的数字孪生系统研究中,存在数字端对物理端真实情况反应不足的问题。针对此问题,采用外置视觉和数字孪生系统模型相结合的方法,基于半物理仿真技术建立数字端模型,并构建了直角坐标机器人数字孪生系统,设计了结合外置视觉的数字孪生系统模型,并就构建数字孪生系统所涉及的关键技术进行了分析,包括数字端模型、控制器、外置视觉监测等。实现了对直角坐标机器人数字孪生系统的开发,完成了相关功能的实现。

民用飞机数字压调激励测试系统的设计与实现

对于安全性较高的民用航空机载系统,其验证方法是研究重点。为此,介绍了一种数字式座舱压调激励测试系统。该系统能模拟飞机外界大气环境、座舱环境和执行机构,在全实物环境和半实物环境等工况下通过模式配置实现不同环境下的测试场景,可应用于数字压调系统的调试、试验、验收提交及地面联试等工作。其中,半实物仿真验证功能尤为重要,能大大降低系统试验验证的成本。

电力系统电磁暂态-机电暂态混合仿真接口原理

在电力系统仿真中,如果能在一次仿真过程中同时实现大规模电网的机电暂态仿真与部分电网的详细电磁暂态仿真,那么对详细分析系统特性,特别是直流输电、FACTS元件等的特性具有重要的理论价值和现实意义。针对这一问题,笔者在比较电磁暂态仿真和机电暂态仿真模型与方法的基础上提出了一种电力系统电磁暂态-机电暂态混合仿真的通用接口方法。该方法在我国实际电网中的成功应用证明了其有效性和实用性。笔者将分三个系列进行相关讨论,此文为系列报告之一,主要提出了电磁暂态-机电暂态混合仿真的实现原理及接口模型,如接口等值电路的设计、接口交换时序的设计等。

基于变电站数字物理混合仿真技术的多级联合仿真培训系统

介绍了作者研发的基于变电站数字物理混合仿真技术的多级联合仿真培训系统总体结构、关键技术及实现方法。该系统对变电站内监控系统、保护及测控装置、五防系统等采用现场真实物理设备,而变电站一次设备及其邻近电网采用数字仿真,同时采用电磁暂态与全动态电网联合仿真技术,这样既能详细而真实地反映变电站一次设备的行为,又能逼真地再现大电网各类动态过程对变电站的影响。应用该系统可以进行调度、集控站以及变电站运行人员的联合培训和反事故演习,特别是能够有效提高变电站运行人员实际操作的训练效果,并加强变电站人员的电网概念和全局观念。