共查询到18条相似文献,搜索用时 203 毫秒
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柴油机是复杂的能量转换系统,其数字化设计技术涵盖了计算机辅助设计、仿真模拟及可视化等多方面的内容。通过VB界面,调用Auto CAD内部的绘图程序以及Matlab/Simulink软件,可以实现柴油机缸内工作过程计算、分析,以及机体CAD绘图的一体化运行。结合数据库技术实现参数和计算结果的存储和读取,使柴油机结构参数优化以及性能分析更加高效。 相似文献
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基于Matlab/Simulink平台进行半实物仿真温度控制,能够有效提高Matlab/Simulink在温度控制系统设计中的应用水平,使温度控制系统设计更加方便快捷。采用OPC技术实现Simulink与亚当数据采集卡的通信,采用电炉作为控制对象,通过PID控制方法开发完成了一套半实物仿真温度控制系统。利用该系统可以方便实现过程控制中的温度控制。实验证明,该温度控制方法简单易行、成本低且具有很好的通用性。 相似文献
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在柴油机工作过程分析的基础上,利用Matlab/Simulink软件建立了柴油机的稳态仿真计算程序,实现了柴油机每个模型程序的模块化,并以某型增压柴油机为研究对象,对其不同的负荷进行仿真计算,计算结果与试验结果基本吻合,验证了编写的Simulink仿真程序的准确性。在此基础上,应用MATLAB提供的GUIDE界面设计环境,对Simulink仿真程序进行了GUI人机交换界面的设计,可通过GUI界面来控制Simulink程序以及参数的设置,并能够方便的显示出不同工况下的仿真计算结果,程序应用更加灵活快捷,提高了仿真计算的效率。 相似文献
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The purpose of this work consists in thermodynamic modeling of hybrid photovoltaic–thermal (PV/T) solar systems, pursuing a modular strategy approach provided by Simulink/Matlab.PV/T solar systems are a recently emerging solar technology that allows for the simultaneous conversion of solar energy into both electricity and heat. This type of technology present some interesting advantages over the conventional “side-by-side” thermal and PV solar systems, such as higher combined electrical/thermal energy outputs per unit area, and a more uniform and aesthetical pleasant roof area. Despite the fact that early research on PV/T systems can be traced back to the seventies, only recently it has gained a renewed impetus. In this work, parametric studies and annual transient simulations of PV/T systems are undertaken in Simulink/Matlab. The obtained results show an average annual solar fraction of 67%, and a global overall efficiency of 24% (i.e. 15% thermal and 9% electrical), for a typical four-person single-familiar residency in Lisbon, with p-Si cells, and a collector area of 6 m2. A sensitivity analysis performed on the PV/T collector suggests that the most important variable that should be addressed to improve thermal performance is the photovoltaic (PV) module emittance. Based on those results, some additional improvements are proposed, such as the use of vacuum, or a noble gas at low-pressure, to allow for the removal of PV cells encapsulation without air oxidation and degradation, and thus reducing the PV module emittance. Preliminary results show that this option allows for an 8% increase on optical thermal efficiency, and a substantial reduction of thermal losses, suggesting the possibility of working at higher fluid temperatures. The higher working temperatures negative effect in electrical efficiency was negligible, due to compensation by improved optical properties. The simulation results are compared with experimental data obtained from other authors and perform reasonably well.The Simulink modeling platform has been mainly used worldwide on simulation of control systems, digital signal processing and electric circuits, but there are very few examples of application to solar energy systems modeling. This work uses the modular environment of Simulink/Matlab to model individual PV/T system components, and to assemble the entire installation layout. The results show that the modular approach strategy provided by Matlab/Simulink environment is applicable to solar systems modeling, providing good code scalability, faster developing time, and simpler integration with external computational tools, when compared with traditional imperative-oriented programming languages. 相似文献
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为深入研究直驱风电机组与无功补偿装置交互作用引发的次/超同步振荡问题,首先,利用谐波线性化方法建立直驱风电机组与SVG交互作用的正序阻抗模型,并在此模型的基础上,给出了基于阻抗的稳定性判据;然后,通过波特图分析了SVG控制参数对直驱风电机组阻抗特性的影响,揭示锁相环和电流环控制参数对直驱风电机组与SVG交互作用的次/超同步振荡特性的作用规律;最后,基于Matlab/Simulink仿真平台搭建了直驱风电机组并网系统进行时域仿真,并与频域分析加以比较,验证了阻抗特性分析的合理性。 相似文献
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针对近年来风电机组大型化对偏航系统稳定性提出的高要求,提出将模糊控制应用于偏航控制系统中。分析了偏航控制系统的工作原理;对偏航系统设计了模糊控制器,并对其控制过程设计了软件流程图;在Matlab/Simulink仿真平台中搭建了该系统的仿真模型,进行了仿真实验,并与传统PID控制方法的控制效果进行了比较分析。结果表明,模糊控制系统能同时满足偏航系统对控制精度和稳定性的要求,其整体性能优于PID控制系统。 相似文献
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Chuan Fang Liangfei Xu Siliang Cheng Jianqiu Li Hongliang Jiang Minggao Ouyang 《International Journal of Hydrogen Energy》2017,42(16):11745-11757
The temperature regulation of a cooling system of a PEMFC (Proton Exchange Membrane Fuel Cell) test bench is studied in this paper. Because of the unique configuration which is dedicated for cold start experiments, the operation at nominal temperature is unstable with a simple PI controller. A sliding-based control strategy is applied to suppress the temperature fluctuation. Firstly the structure of the cooling system is demonstrated and the cause of temperature fluctuation is analyzed. Then, a physics-based model of the cooling system is proposed on the Matlab/Simulink platform and validated with experimental data. Based on the model, a Sliding-mode controller with Extended Kalman Filter (EKF) is designed to regulate the temperature. The simulation results showed that the controlled system performed satisfactorily. Furthermore, when applied to the real system, the controller's real-time performance fulfills the test bench criterion. Experimental data show that the coolant temperature at the outlet of the fuel cell stack is kept in a range within ±1 °C, disregarding the heat generated at various working condition. 相似文献
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李建林 《电网与水力发电进展》2012,28(12):61-65
总结介绍了6种常用的控制方法,阐述各自工作原理以及优缺点,针对一实际算例,就能量型与功率型储能系统,设计了其DC/DC和DC/AC控制策略及DC/AC滤波环节,并给予Matlab/Simulink仿真平台搭建风储系统仿真模型。通过仿真结果表明,所设计控制策略下的电池储能能够平滑风电输出的波动,达到并网要求,2种不同类型的储能电池,能够优势互补,利于延长储能电池寿命。 相似文献