Reliability and sensitivity analysis of loop-designed security and stability control system in interconnected power systems

Security and stability control system(SSCS)in power systems involves collecting information and sending the decision from/to control stations at different layers;the tree structure of the SSCS requires more levels.Failure of a station or channel can cause all the execution stations(EXs)to be out of control.The randomness of the controllable capacity of the EXs increases the difficulty of the reliability evaluation of the SSCS.In this study,the loop designed SSCS and reliability analysis are examined for the interconnected systems.The uncertainty analysis of the controllable capacity based on the evidence theory for the SSCS is proposed.The bidirectional and loop channels are introduced to reduce the layers and stations of the existing SSCS with tree configuration.The reliability evaluation and sensitivity analysis are proposed to quantify the controllability and vulnerable components for the SSCS in different configurations.By aiming at the randomness of the controllable capacity of the EXs,the uncertainty analysis of the controllable capacity of the SSCS based on the evidence theory is proposed to quantify the probability of the SSCS for balancing the active power deficiency of the grid.

Energy-efficient joint UAV secure communication and 3D trajectory optimization assisted by reconfigurable intelligent surfaces in the presence of eavesdroppers

We consider a scenario where an unmanned aerial vehicle(UAV),a typical unmanned aerial system(UAS),transmits confidential data to a moving ground target in the presence of multiple eavesdroppers.Multiple friendly reconfigurable intelligent surfaces(RISs) help to secure the UAV-target communication and improve the energy efficiency of the UAV.We formulate an optimization problem to minimize the energy consumption of the UAV,subject to the mobility constraint of the UAV and that the achievable secrecy rate at the target is over a given threshold.We present an online planning method following the framework of model predictive control(MPC) to jointly optimize the motion of the UAV and the configurations of the RISs.The effectiveness of the proposed method is validated via computer simulations.

Integrative Stability Analysis for A Class of Intelligent Control Systems

In this paper the integrative stability is studied for a class of intelligent control systems which are described by an octette structural model. Based on the definitions Of state reachability and stabilizability of intelligent control systems the analysis method and criterion of integrative stability are given.

The intelligent security system based on the public switch telephone network

This paper elaborates the design and development of the intelligent security system based on the public switch telephone network.The system includes two parts:security detection emission,and radio reception and signal process connected to the phone line with the telephone set at home or in the office.The core of radio reception and signal process is Micro Control Unit,which, in coordination with other peripheral circuits such as telephone line interface,signaling tone detection,dual tone multi-frequency(DTMF)reception and emission,and voice notification,informs the subscriber of the alarm via voice through Public Switch Telephone Network(PSTN).In addition,the subscriber can easily modify telephone numbers stored in the system.

Guidance and Control System for Platoon of Autonomous Mobile Robots

This paper presents a concept of platoon movement of autonomous vehicles(smart cars).Autonomous vehicles have ACC(adaptive or advanced cruise control)system also called ICC(intelligent cruise control)or AICC(adaptive intelligent cruise control)system.These vehicles are suitable to follow other vehicles on desired distance and to be organized in platoons.To be able to do research to the control and stability of an AGV(automated guided vehicles)string,a car-following model is being determined.To do this,first a single vehicle is modelled and since all cars in the platoon have the same dynamics,the single vehicle model is copied ten times to form model of platoon(string)with ten vehicles.To control this string,equal PID(proportional-integral-derivative)controllers are applied to all vehicles,except the leading vehicle.These controllers try to keep the headway distance as constant as possible and the velocity between subsequent vehicles error small.For control of vehicle with nonlinear dynamics combination of feedforward control and feedback control approach is used.Feedforward control is based on inverse model of nominal dynamics of the vehicle,and feedback PID control is designed on base of linearized model of the vehicle.For simulation and analysis of vehicle and platoon of vehicles Matlab/Simulink models are designed.Simulation results,discussions and conclusions are given at the end of the paper.

Artificial Intelligence:International Security Challenges and Governance

Recently,the rapid development of artificial intelligence technology—and its application in the military field—has attracted extensive attention in the public,policy,and academic circles.However,different research paradigms and debates on the nature and aspects of AI challenges to international security exist in theory and policy.In the process of the international community’s exploration of AI global security governance,effectively integrating the views of all parties and constructing consensus international norms is difficult.This paper summarizes and analyzes the current debates on the challenges and governance of AI technology to international security,the multiple evolutions of international security governance norms in the era of AI,and the cooperation and competition between China and the United States in the field of AI international security.Sorting out and exploring these arguments can provide a new research direction and perspective for exploring the global governance path of artificial intelligence.

通用人工智能的数据风险及法治应对路径

ChatGPT的横空出世拉开了通用人工智能的时代序幕。通用人工智能迭代泛化能力的实现依托于海量数据,其运行全程与数据深度耦合,伴生了新的数据风险,且随着模型的普适化应用可能演化为现实威胁并产生严重后果。运用“全周期管理”理念剖析通用人工智能的输入、加工、输出环节存在的数据风险,包括多源数据违规获取风险、数据利用存储安全风险、数据虚假生成质量风险。在此基础上,围绕法律规制、伦理引导和行政监管的三重路径构建数据风险治理框架,提出中国应从完善保护利用并举的数据法律制度、健全科技向善导向的技术伦理规范、设计注重风险防控的行政监管规则等方面,化解模型“输入—加工—输出”进程中产生的数据风险,从而推动通用人工智能的良性健康发展。

外部干扰和随机DoS攻击下的网联车安全H∞队列控制

针对网联车队列系统易受到干扰和拒绝服务(Denial of service, DoS)攻击问题,提出一种外部干扰和随机DoS攻击作用下的网联车安全H∞队列控制方法.首先,采用马尔科夫随机过程,将网联车随机DoS攻击特性建模为一个随机通信拓扑切换模型,据此设计网联车安全队列控制协议.然后,采用线性矩阵不等式(Linear matrix inequality, LMI)技术计算安全队列控制器参数,并应用Lyapunov-Krasovskii稳定性理论,建立在外部扰动和随机DoS攻击下队列系统稳定性充分条件.在此基础上,分析得到该队列闭环系统的弦稳定性充分条件.最后,通过7辆车组成的队列系统对比仿真实验,验证该方法的优越性.

考虑姿态稳定性的智能客车轨迹跟踪控制研究

针对智能客车行驶中遇到突发情况时驾驶员应急激烈操作以及车辆传感器识别误差导致车辆路径规划不合理引起的车辆侧翻,提出一种基于车身姿态稳定性的轨迹跟踪控制策略.根据现有主动防侧倾研究基础推导智能客车目标侧倾角算法,以横向载荷转移率为侧翻指标,采用卡尔曼滤波算法进行车辆参数估计,实现横向载荷转移率预测.根据智能客车横向载荷转移率预测值设计基于差动制动的纵向控制策略、考虑车身侧倾和俯仰运动的垂向控制策略以及轨迹跟踪横向控制策略,最后通过仿真验证上述策略控制效果.结果表明,基于车身姿态稳定性的轨迹跟踪控制策略在车辆行驶遇到突发情况驾驶员激烈操作时能够保证车辆行驶稳定,在智能客车轨迹跟踪过程中能降低车辆侧翻风险.

两种新型稳控系统的对比研究

为适应新型电力系统环境下电网安全稳定性的快速大幅变化,需要研制新型安全稳定的控制系统。新型稳控系统存在两种技术方案:智能决策自升级稳控系统和在线稳控系统。从构建思路、系统架构、关键技术和实现难度等方面对这两种方案进行了研究,阐述了两者之间的区别与联系,并给出了推荐方案,为稳控系统的技术发展提供了有益思路。

面向稳控系统E1通道的网络靶场实验台的设计与实现

随着智能电网和跨区稳定控制技术的发展,信息通信与电力系统的耦合更加紧密,网络攻击带来的安全风险也越来越高。稳控系统E1通道作为重要的测控通道,其安全性对稳控系统起到重要的作用,因此,开展面向稳控系统E1通道的半实物仿真和攻防演练,对发现E1通道的安全漏洞有重要意义。首先,基于半实物仿真技术设计了面向稳控系统E1通道的网络靶场实验台,介绍基于该实验台的攻防演练方案;然后,通过该实验台对一个典型的在运稳控系统E1通道开展仿真和攻击模拟实验,测试了稳控系统的安全隐患,并验证了实验台的有效性;最后,提出几种提升E1通道安全性的方法,并展望了实验台的应用前景。

美国商务部工业与安全局情报工作透视

[研究目的]从情报学和情报工作专业视角研究美国商务部工业与安全局(The Bureau of Industry and Secur-ity of U.S.Department of Commerce,BIS)的情报工作,为新时期中国情报学和情报工作创新发展提供参考。[研究方法]通过BIS官方网站信息内容研究、官方网站重要文件研究、瓦森纳协定官方网站信息内容研究、BIS典型执法案例研究相结合的方法,研究BIS情报工作的全貌和精要。[研究结论]从情报学和情报工作专业视角对BIS的组织机构使命、组织网络、信息网络、人际网络、法律保障、典型情报工作、提升美国出口商情报能力的主要工作进行研究,揭示了BIS情报工作全貌、精要和最突出的关键成功因素。

考虑稳定边界和侧倾稳定的车辆路径跟踪控制

为了解决无人驾驶车辆的路径跟踪任务中跟踪精度和车辆稳定性之间的冲突问题,提出了一种考虑横向和侧向稳定的路径跟踪控制器.首先以四轮独立驱动智能车为研究对象,设计了一种基于主动转向和电机驱动扭矩分配的整体模型预测控制器,以保证车辆在极端工况下的稳定和跟踪精度.然后通过相位图法和轮胎最大侧偏角设计车辆稳定性约束以优化动力学性能,利用零力矩方法建立侧倾约束,防止侧倾.最后在仿真中对比现有控制器,结果表明,所提出的控制器能够最大化地发挥车辆动力学极限,并在保证车辆稳定性的同时提高车辆的路径跟踪精度.

基于时序卷积残差网络和鹈鹕优化算法的新能源电网安全稳定控制方法

随着“双碳”目标的推进,随机波动的新能源接入电网的规模和容量日益提升,严重影响电网的安全稳定运行。针对大干扰故障电压稳定控制问题,文章提出了一种基于时序卷积残差网络和鹈鹕优化算法的新能源电网电压安全稳定控制策略。首先,利用时序卷积信息损失少、感受野宽以及残差网络深层特征提取能力强的优势,构建基于时序卷积残差网络的电压稳定预测模型,映射出敏感节点电压时序特征和电压稳定之间的关系;其次,构建电压稳定控制模型,利用鹈鹕优化算法收敛速度快、搜索能力强的优势求解控制模型,得出最佳切机和切负荷动作措施;最后,进行了仿真验证。验证结果表明,所提方法提高了新能源电网电压安全稳定预测的准确性,通过最佳的电压稳定控制策略提高了电网故障后的安全稳定运行水平。

泥水平衡顶管下穿运营铁路施工安全影响分析

结合某电厂至呼和浩特市长输供热管网工程泥水平衡顶管施工项目,采用数值模拟的方法,对顶管穿越段京包客专、京包铁路、呼王联络线路基及呼王联络线桥梁变形进行仿真分析,揭示泥水平衡套管下穿运营铁路施工对路基及桥梁的影响。结果表明:客专线路路用便梁和管棚加固、普速线路路基采用管棚加固、桥梁基础采用注浆防护后,既有运营铁路路基及桥梁的变形值均能满足铁路运营的安全要求,根据三种不同等级的铁路,所提出的三种加固设计方案均切实有效、可行。

提升末端区域电网供电能力的调控方案及稳控策略研究

针对内蒙古某末端区域电网供电能力受同塔双回线路N-2故障及母线故障制约问题,开展安全稳定控制系统(以下简称稳控系统)控制策略研究。首先,基于对典型故障后末端区域电网稳定特性的仿真计算与分析,结合新能源出力、火电机组开机等对切负荷定值的影响,制订预控方案与稳控系统相结合的综合调度控制方案;然后,分析电解铝行业整流变压器负荷转移特性,提出可优先实切负荷量计算方法和适用于末端电网的分档阶梯切负荷原则,对末端区域电网稳控系统的控制策略进行优化。

光伏板智能清洁机器人设计与实现

为有效解决光伏板表面灰尘覆盖问题,提高光伏电站光电转化效率,根据目前光伏板安装环境,设计一种光伏板智能清洁机器人。机器人由行走机构、清洁机构、控制模块以及各传感器组成,可在光伏板上自主进行清洁工作。对机器人的行走机构和清洁机构进行设计计算,再通过力学分析得出机器人运动稳定性条件,然后结合机器人功能对机器人的控制系统进行设计,最后制作出机器人样机。通过对机器人进行运动和清洁性能测试,此机器人可在25°以下的斜面上稳定运动,清洁机构对于浮尘或积垢类污渍都具有一定的清洁能力,且机器人可按照设计路径自主完成清洁工作。与传统清洁方式相比,在解决光伏板灰尘覆盖问题的同时,极大地降低了人工成本,减少了水资源的浪费。

基于数字孪生的安全稳定控制系统试验验证展望

随着新型电力系统建设的推进,安全稳定控制系统呈现出控制对象增多、控制范围增大、耦合性增强、复杂度增高的趋势,现有工程试验验证方法无法满足未来安全稳定控制系统试验验证需求。考虑到数字孪生技术具有高保真、实时性、交互性的特点,结合数字孪生技术的内涵、模型、架构,提出了基于数字孪生的安全稳定控制系统试验验证架构。最后,对所涉及的关键技术进行了展望。

通信中断下考虑行驶状态时空收敛的混合编队稳定性控制算法

针对通信中断下由智能网联车辆(Connected and Automated Vehicles,CAV)与人工驾驶车辆(Manually Driven Vehicles,MDV)所组成的混合编队的稳定性控制问题,考虑基于前车-领航车通信拓扑(Predecessor-Leader Following topology,PLF)和协同自适应巡航控制(Cooperative Adaptive Cruise Control,CACC)的混合编队,构建通信正常和通信中断状态下的车辆控制器.基于Routh-Hurwitz稳定性判据和频域分析方法设计稳定条件求解算法,计算控制器和MDV跟驰模型的稳定性条件,并提出针对两种控制器的平滑切换策略.案例分析表明:车队能够稳定安全行驶,各车速度标准差变化率均低于1.8%,平均加速度变化量和其平均值均低于0.016 m/s^(2),说明所提出的稳定性控制算法具有良好的有效性,可实现车辆及编队行驶状态的时空收敛;针对加速场景和减速场景,所提出的控制器切换策略能够分别减小车辆加速度波动幅度达37.1%和59.9%,控制器切换过程中的车辆状态稳定性得到显著提升.

基于区块链的电网安稳控制通信报文记录与审计系统研究

随着电网安全稳定控制系统向广域化、复杂化方向发展,安稳控制通信报文数量多,通信链条长,易被篡改。当通信报文异变或损坏导致安控系统发生误动或拒动时,难以准确判断事故原因。针对该问题,提出一个基于区块链的电网安稳控制通信报文记录与审计系统。基于安控系统架构与管理需求设计半中心化系统模型,并针对安控系统架构与业务特点设计交叉多链结构。实验结果表明,该方案能够提高安稳控制通信报文记录与审计的真实性、完整性和安全性,同时具有较好的性能。