Study on DeviceNet communication mechanism and its application in protection measurement and control system

To fit in with the developing requirement of int and communication of protective relays, a protection egrated functions of protection measurement, control measurement and control system based on DeviceNet fieldbus is designed. The communication mechanism of DeviceNet is studied and data trigger modes, communication connection, message types and other key technologies are analyzed. The object modeling and device description of the device are realized too. Results of network test, dynamic simulation and test in the field indicate that this system can accomplish all the communication tasks in real time and can make precise response to every kind of faults of the motor, transformer, line and capacitor. Moreover, this system has higher measurement precision and better control capability.

Research on Technology of Electromagnetic Protection for the Generator Control System

Generator control system decides whether the generator can work as usual or not, as well as its stability of performance. Both types of generators control system composed of the transistor and DSP are sensitive to outward electromagnetic interference, directly related to the generator performance. In this text, we first analyze the electromagnetic interference threat generator control system of transistor type may face, then design a electromagnetic protection plan for the intake, the panel and the sense organ. This work is of great significance in improving its electromagnetic protection ability and stability of performance.

Histone demethylase JMJD3 downregulation protects against aberrant force-induced osteoarthritis through epigenetic control of NR4A1

Osteoarthritis(OA)is a prevalent joint disease with no effective treatment strategies.Aberrant mechanical stimuli was demonstrated to be an essential factor for OA pathogenesis.Although multiple studies have detected potential regulatory mechanisms underlying OA and have concentrated on developing novel treatment strategies,the epigenetic control of OA remains unclear.Histone demethylase JMJD3 has been reported to mediate multiple physiological and pathological processes,including cell differentiation,proliferation,autophagy,and apoptosis.However,the regulation of JMJD3 in aberrant force-related OA and its mediatory effect on disease progression are still unknown.In this work,we confirmed the upregulation of JMJD3 in aberrant forceinduced cartilage injury in vitro and in vivo.Functionally,inhibition of JMJD3 by its inhibitor,GSK-J4,or downregulation of JMJD3 by adenovirus infection of sh-JMJD3 could alleviate the aberrant force-induced chondrocyte injury.Mechanistic investigation illustrated that aberrant force induces JMJD3 expression and then demethylates H3K27me3 at the NR4A1 promoter to promote its expression.Further experiments indicated that NR4A1 can regulate chondrocyte apoptosis,cartilage degeneration,extracellular matrix degradation,and inflammatory responses.In vivo,anterior cruciate ligament transection(ACLT)was performed to construct an OA model,and the therapeutic effect of GSK-J4 was validated.More importantly,we adopted a peptide-si RNA nanoplatform to deliver si-JMJD3 into articular cartilage,and the severity of joint degeneration was remarkably mitigated.Taken together,our findings demonstrated that JMJD3 is flow-responsive and epigenetically regulates OA progression.Our work provides evidences for JMJD3 inhibition as an innovative epigenetic therapy approach for joint diseases by utilizing p5RHH-si RNA nanocomplexes.

Fuzzy Controller Used to Protect Collision

A FC-1B type fuzzy controller used to protect collision in automobile running has heen devel-oped by Computer Institute, North Technological University. This facility has been authenticatedby specialists. This is a sci-tech fruit which integrates the hardware and software from fuzzy con-trol and artificial intelligence. This technique adopts initiative r-ime ultrasonic range-findingprobe, rapid fuzzy control algorithm, fuzzy discern and fuzzy decision etc. This technique is adapt-

AREVA Control Room Accident Filtration System CRAFT

The AREVA CRAFT （control room accident filtration system） is a solution that maintains the proper air conditions in the main control room and emergency control facilities by filtering the air and removing noble gases in case of a severe accident in a nuclear power plant with increased activity concentration in the plant environment.

A DoS Attacks Detection Aglorithm Based on Snort-BASE for Robotic Arm Control Systems

In response to the frequent safety accidents of industrial robots, this paper designs and implements a safety detection system for robot control. It can perform real-time security detection of robot operations on industrial production lines to improve the security and reliability of robot control systems. This paper designs and implements a robot control system based Snort-BASE for real-time online detection of DoS attacks. The system uses a six-degree-of-freedom robotic arm as an example, uses Snort to record the network communication data of the robot arm control system in real time, and filters the network traffic through self-defined rules, and then uses the BASE analysis platform to achieve security analysis of the network traffic. The solution verifies the effectiveness of online real-time detection of attacks and visualisation of attack records by designing simulated robotic arm and real robotic arm attack experiments respectively, thus achieving the security of network communication of the robot remote control system.

IMPROVED FOURIER ALGORITHM FOR CORRECTING POWER SYSTEM FREQUENCY DEVIATION

On the basis of high precision requirement for input signals in the power system protection and control system,this paper,only for the influence of power system frequency deviation on extracting fundamental harmonic,studies the amplitude error of Fourier algorithm,presents a method of correcting frequency deviation,and further derives the formulas of improved Fourier algorithm.The simulation results verified the effectiveness of the algorithm,it not only can greatly weaken the influence of frequency deviation,but also increase the precision of the power system protection and control.As a result the study in this paper has practical application value.

Process Design of Cryogenic Distribution System for CFETR CS Model Coil

The superconducting magnet of Central Solenoid（CS） model coil of China Fusion Engineering Test Reactor（CFETR） is made of Nb_3Sn/Nb Ti cable-in-conduit conductor（CICC）,and operated by forced-flow cooling with a large amount of supercritical helium.The cryogenic circulation pump is analyzed and considered to be effective in achieving the supercritical helium（SHe） circulation for the forced-flow cooled（FFC） CICC magnet.A distributed system will be constructed for cooling the CFETR CS model coil.This paper presents the design of FFC process for the CFETR CS model coil.The equipment configuration,quench protection in the magnet and the process control are presented.

Technology and engineering application of cross area HVDC interconnection system high-precision simulation modeling based on ADPSS

In recent years, a large number of high voltage direct current(HVDC) transmission projects have been connected to AC systems. This has started to have an impact on AC/DC hybrid power grids, particularly receiving terminal power grids. An HVDC system is a large-scale power electronic integrated nonlinear system, and it includes a primary system and a control and protection system. Hence, the precision and degree of detail of HVDC systems directly affect the actual effect of simulation. In recent years, in the case of the normal operation and failure of AC power grids, the abnormal fluctuation and even locking of HVDC systems caused by the inappropriate strategies of the control and protection system component have strongly affected power grids. This has significantly affected the safety and stability of receiving power grids and normal operation. In this study, the actual engineering HVDC control logic provided by a manufacturer is analyzed and simulated based on the user defined component library of the ADPSS electromagnetic transient calculation program, and an HVDC control model based on an actual system is established. The accuracy of the DC control custom model based on ADPSS is verified through the simulation of an actual power grid.

Hardware/Compiler Memory Protection in Sensor Nodes

With reference to sensor node architectures, we consider the problem of supporting forms of memory protection through a hardware/compiler approach that takes advantage of a low-cost protection circuitry inside the microcontroller, interposed between the processor and the storage devices. Our design effort complies with the stringent limitations existing in these architectures in terms of hardware complexity, available storage and energy consumption. Rather that precluding deliberately harmful programs from producing their effects, our solution is aimed at limiting the spread of programming errors outside the memory scope of the running program. The discussion evaluates the resulting protection environment from a number of salient viewpoints that include the implementation of common protection paradigms, efficiency in the distribution and revocation of access privileges, and the lack of a privileged (kernel) mode.

电力信息物理系统中信息系统物理化的建模及分析方法

该文基于信息系统物理化的设想提出电力信息物理系统(cyber-physical power system,CPPS)中的信息流建模和计算分析方法。采用连续时间函数来刻画信息流的特征,并定义信息网络运行参数为流量累积函数、信息流速和时延。首先,基于遍历法搜索出信息流路径,建立信息流速矩阵的范式;然后利用改进的网络演算(network calculus,NC)特性赋值流速矩阵的元素;进一步采用流量累积函数表征信源数据发送规律,从而显式求解时延上界。最后将提出的信息流建模方法应用于智能变电站自动化系统的时延计算,通过与OPNET的仿真结果相比较,验证所提出模型的有效性,而且该方法可以提供定量分析指标以优化变电站组网方案设计中的信息流分布。

基于可信计算的保护控制设备主动防护技术研究与实现

变电站保护控制设备在边界安全防护体系下得以安全稳定运行,但随着信息化、网络化技术不断应用,变电站网络安全要求也在发生变化,过度依赖边界防护的保护控制设备缺乏本体主动防护能力的问题逐渐突显。文章比较分析了不同主动防护技术后,选择了基于可信计算的主动防护技术进行研究,结合保护控制设备的高实时、高可靠等特点,给出了适合保护控制设备的可信计算双体系架构和具体硬软件实现方案。最后,保护监控设备主动防护效果通过了第三方检测机构的验证,且防护功能的增加并未对设备的功能和性能产生明显的影响,该方案具备工程化应用和推广价值。

广东省传统村落集中连片保护利用全过程导控体系探索

随着我国传统村落的保护发展模式向区域性保护转变,亟待对历史文化资源丰富的广东省展开传统村落集中连片保护利用资源分析与发展建议。利用GIS空间分析、指针评估、实证分析的方法,明确了申报前进行广东传统村落及其基础资源摸查与预申报,规划时依据传统村落集中连片保护利用导则制定保护规划,实施后定期开展实施效果监测进行反馈调节的三阶段引导,探索构建广东省传统村落集中连片保护利用全过程导控体系,并以梅县区为例进行实证分析,以期为优化现有传统村落集中连片保护利用工作的系统性与持续性指导提供参考。

新工科背景下“电力系统保护与控制”课程教学改革

“电力系统保护与控制”是电气工程及其自动化专业的核心课程,基于新工科背景,通过对该课程现状深入分析,发现其存在教材内容繁多且交叉、授课方式不够丰富、评价标准不够完善、立德树人环节较为薄弱等问题,从课程思政建设、教学手段和方法改进、考核评价方式制定以及加强校企联合培养四个方面提出了相应的措施进行改革创新,以提升学生的学习兴趣,培养学生专业知识融合、理论联系实际、分析问题、解决问题和创新的能力,并在传授专业知识的同时,实现对学生的价值引领。

级联多端特高压直流控制保护系统配置及策略

该文针对金上直流工程主回路拓扑结构与运行方式的特点,设计了送端分址级联多端特高压直流控制保护系统的配置方案;提出送端分站的高、低压换流器的电压平衡控制方案,根据送端两站间通信条件,切换采用附加电压平衡控制的触发角协调控制和串联两换流器一个定电压、另一个定电流的控制策略;基于送端分站级联拓扑,研究了其直流保护功能配置方案,并提出针对送端站1内的极区/换流器区故障或者送端两站之间直流线路永久故障的快速清除方法。基于控制保护工程样机的RTDS闭环仿真结果表明,该级联多端特高压直流控制保护系统可以满足实际工程应用的要求。

电力系统保护与控制实验评定体系构建

以专业认证为发展契机,探讨了实验评定体系对实验教学的重要性。在对几种常见的成绩评定方法探索的基础上,引入了改进模糊层次分析法,将实验评定体系分解成目标层、准则层、指标层进行定性与定量分析,使用MATLAB进行求解,得到了影响评定体系的各因素权重,并用模糊综合评价法得出学生的最终成绩。结果表明基于改进模糊层次分析法的电力系统保护与控制实验评定体系使实验成绩更加科学与全面,促进了教学目标的达成。

深井矿山热害防治及制冷降温技术应用

随着金属矿山开采深度的增加,高地温越加显现,而矿山在热害控制方面经验不足、个体防护及培训缺失、有效的机械制冷技术应用较少等,亟待加强深井金属矿山热害防治安全技术相关研究。本文分析了深井矿山热环境对作业人员、生产效率的影响,总结了热害防治的综合措施,包括通风系统优化、热源控制、个体防护、压缩空气制冷、机械制冷等方面,列举了南非、澳大利亚两座典型深井矿山机械制冷降温技术的典型应用,供其他深井矿山借鉴。

高速铁路牵引变电所智能化建设方案研究

智能牵引变电所是智能牵引供电系统的核心,由智能化一次系统、广域保护测控系统和智能辅助系统构成。为提高目前在建高铁牵引供电系统智能化水平,探讨并提出了针对其牵引变电所的智能化改造方案。

职业化背景下消防法律问题研究

火灾事故频发既给我国火灾防控带来了巨大挑战,也对我国火灾防控管理法治化提出了更高的要求。针对我国消防部门改革转隶后职业化发展建设仍存在着消防法律体例架构不完备、法律保障机制不健全、法律责任不完善等问题,根据“十四五”消防规划的总体布局要求,通过合理构建消防法律体例布局、健全消防法律内容、完善消防法律责任,推进消防体制职业化改革,构建完善的职业化消防法规体系。