共查询到20条相似文献,搜索用时 962 毫秒
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介绍了用小波阈值滤波对光纤温度测量系统信号进行仿真的方法。该方法基于信号和白噪声在小波变换下具有不同的特性,将含噪信号进行多尺度小波分解,采用软闽值方法将其高频部分进行量化处理,再进行重构。实验证明该方法有效去除了信号中的噪声,方便地用软件实现了比色测温信号的处理,提高了系统的测温精度。 相似文献
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楼宇冷热电联供系统仿真及其影响制冷效果的分析 总被引:1,自引:0,他引:1
以上海交通大学某大楼的BCHP系统为研究对象,在ISEpro仿真平台上建立系统仿真模型,利用该模型对影响制冷效果的蒸汽压力、冷却水进口温度、冷媒水进口温度等因素进行了仿真分析,发现冷媒水进口温度、冷却水进口温度、工作蒸汽压力等因素对制冷效果影响较大,其结果和实际应用和理论计算相一致,表明该模型可以用来对楼宇冷热电系统进行仿真,并可为楼宇冷联供的设计、操作运行、控制调节提供指导. 相似文献
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提出一种基于单片机,并采用数字化单总线技术的温度测控系统应用于交换机房的的设计方案,能对多点的温度进行实时巡检,各检测单元能独立完成各自功能,同时能够根据主控机的指令对温度进行定时采集,测量结果不仅能在本地显示,而且可以利用单片机串行口,通过RS-485总线及通信协议将采集的数据传送到计算机,进行进一步的存档、处理。完成了下位机系统和上位机系统的软硬件设计,实现了一种可以应用于交换机房的智能温度检测系统。在实验室中进行了仿真运行,实验结果良好。 相似文献
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针对某核电机组近期多次发生励磁控制系统异常的情况,收集了该核电厂DCS及PMU系统监控信息及故障实时曲线,发现励磁系统辅助强励回路设计存在缺陷。通过建立有和无辅助强励系统的核电机组励磁模型,分别以单机无穷大系统及实际电网运行方式开展仿真计算比对分析,计算结果表明无辅助强励功能的励磁系统能满足核电机组满功率送出及电网安全稳定运行要求,且各项性能均满足相关技术标准,由此提出了退出辅助强励的措施。实际运行情况表明,退出辅助强励后的核电励磁系统运行稳定,说明提出的措施可推广应用于其他同类型核电机组的异常问题处理。 相似文献
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为实现模块化扩容及大功率输出,提出一种模块化隔离变频电源系统控制策略。该策略基于模块化变频信号源并联系统,设计同步控制和均流控制,从变频信号源根据主变频信号源的输出电流自动调节输出功率,实现自适应并联运行。首先,采集主变频信号源的相位信息,从变频信号源通过检测与其相位差产生同步信号并用于控制正弦基准信号的相位同步,进而控制从变频信号源保持同频和同相。此外,从变频信号源检测与主变频信号源的输出电流差值并调整正弦基准进行均流调节,可实现变频信号源间的输出均流。利用Matlab搭建仿真模型,仿真结果表明该控制策略可减小并联环流并有助于隔离变频电源系统稳定运行。 相似文献
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介绍了目前国内在建核电站常规岛给水系统的配置方式,比较了二代核电CPR1000、三代核电AP1000及EPR技术所采用的不同给水配置及特点;作为核电站最重要的系统之一,热力系统设计工程师熟悉并掌握给水系统配置方式,合理地设计该系统,对于电站的安全、经济、灵活运行有着重要影响. 相似文献
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核动力装置是一个高度复杂并具有高度安全性要求的结构体系,其故障检测方法一般采用传统的阈值方法。为克服阈值方法的不足,提出了基于RBF(radial basis function)神经网络的核动力装置故障诊断方法。该方法选择对核动力装置安全具有重要影响的运行参数作为神经网络的输入,并利用核动力装置正常运行模式及典型故障模式的监测数据作为训练样本,网络训练采用正交最小二乘算法(orthogonal least square,OLS)。为了验证所提方法的可行性,利用核动力装置运行监测数据进行检验。结果表明,RBF神经网络成功地诊断出了故障,具有良好的诊断效果。 相似文献
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Yican Wu 《国际能源研究杂志》2019,43(4):1521-1533
Research and development of safe and efficient nuclear energy systems is imperative, since nuclear safety is the key issue in the development of nuclear energy, and it is also the premise of nuclear energy development learned from the painful lessons in history. Advanced numerical simulation can restore the complex physical processes as much as possible and predict system behavior and safety performance, and it facilitates accurate design and assessment. International research in nuclear safety simulation has developed from single physical phenomena simulation to coupling simulation with digital reactor and to comprehensive simulation with virtual nuclear power plant by integrating environmental and social information. Compared with digital reactor, virtual nuclear power plant pays more attention to the evolution of reactor accidents, such as large‐scale physical and social behavior simulation, which concerned the relationship between nuclear safety and environment, as well as the relationship between the nuclear safety and the public. FDS Team proposed “nuclear informatics” firstly by combining nuclear science and informatics and has developed the virtual nuclear power plant in digital society environment Virtual4DS, where many key technologies are developed under the guidance of nuclear informatics, such as integration cloud architecture, automatic accurate modeling, multiphysics coupling simulation, multidimensional information visualization and virtual simulation, and nuclear big data. Virtual4DS has been widely used in the nuclear power plant, nuclear weapons, well logging, etc. 相似文献
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This paper describes a simulation model that reproduces the performance of parabolic trough solar thermal power plants with a thermal storage system. The aim of this model is to facilitate the prediction of the electricity output of these plants during the various stages of their planning, design, construction and operation. Model results for a 50 MWe power plant are presented and compared to real data from an equivalent power plant currently operated by the ACS Industrial Group in Spain. 相似文献
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Modeling and simulation of a grid-connected PV generation system for electromagnetic transient analysis 总被引:9,自引:0,他引:9
This paper addresses modeling and simulation of a grid-connected photovoltaic system (GCPS) to analyze its grid interface behavior and control performance in the system design. A simple circuit model of the solar array is used to easily simulate its inherent characteristics with the basic specification data. Detailed power and protection control of the GCPS as well as its electrical circuits have been represented by user-defined and built-in components to take into account transients in normal and fault conditions, which are dominated by its power electronic controller. The model has been described with the reference to and implemented in PSCAD/EMTDC, a power system transient software package. Extensive simulation results are presented and analyzed to validate that the proposed simulation model is effective for control and protection performance evaluation of the GCPS in terms of electromagnetic transient analysis. 相似文献
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