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基于转速控制的柴油机动态特性建模与仿真
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作者 白锦洋 吴学雷 +1 位作者 张军伟 李洪彪 《北京理工大学学报》 EI CAS CSCD 北大核心 2018年第A01期84-88,共5页
为了仿真柴油机动态特性,建立了基于转速控制的柴油机模型.基于台架稳态试验数据计算得到柴油机扭矩MAP图,并通过动态修正方法获得柴油机动态扭矩;划分了柴油机运行状态,采用基于油量的控制方法,分别设计了全负荷、部分负荷和限速工况... 为了仿真柴油机动态特性,建立了基于转速控制的柴油机模型.基于台架稳态试验数据计算得到柴油机扭矩MAP图,并通过动态修正方法获得柴油机动态扭矩;划分了柴油机运行状态,采用基于油量的控制方法,分别设计了全负荷、部分负荷和限速工况下的控制策略;在Matlab/Simulink环境下建立了柴油机仿真模型,集成传动相关总成建立整车动力学模型,并进行了两种工况仿真,仿真与试验结果表明:模型设计合理,有效模拟了柴油机稳态及瞬态工况;所提出的建模方法解决了在有限试验数据下的发动机动态特性建模问题,研究结果可为快速建立柴油机动态性能预测模型提供参考. 展开更多
关键词 柴油机 动态特性 转速控制 控制策略 与仿真
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电网安全稳定控制系统当值策略可实施评估方法 被引量:18
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作者 王胜明 徐泰山 +3 位作者 陈刚 邵伟 顾健辉 孙才峰 《电力系统自动化》 EI CSCD 北大核心 2019年第24期126-133,共8页
针对电网安全稳定控制系统实际运行过程中当值控制策略是否可以足量执行的在线监视需求,文中首先分析了安全稳定控制装置的控制结构和执行逻辑,建立了面向对象和表达式组态的层次化控制策略模型。然后,提出了综合考虑稳定控制装置的通... 针对电网安全稳定控制系统实际运行过程中当值控制策略是否可以足量执行的在线监视需求,文中首先分析了安全稳定控制装置的控制结构和执行逻辑,建立了面向对象和表达式组态的层次化控制策略模型。然后,提出了综合考虑稳定控制装置的通道通断状态、压板投退状态和电网运行工况的可控量识别方法和当值策略解析识别流程,并在此基础上进一步分析了双重化配置稳定控制装置在不同运行模式和出口连接方式下对动作对象选择的影响,提出了当值策略结果合并方法和可实施状态统计方法,实现了稳定控制系统当值策略的解析识别和在线监视预警,有利于及时发现稳定控制系统在实际运行中可能出现的隐患。最后,结合典型场景下切机和切负荷案例分析验证了所提方法的有效性。 展开更多
关键词 安全稳定控制装置 控制策略建模 当值策略识别 在线监视预警 主辅运行 并列运行
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AUV Modeling and Motion Control Strategy Design 被引量:1
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作者 王芳 万磊 +1 位作者 苏玉民 徐玉如 《Journal of Marine Science and Application》 2010年第4期379-385,共7页
To provide a suitable model for AUV simulation and control purposes, a general nonlinear dynamic model including a novel thruster hydrodynamics model was derived. Based on the modeling method, the "AUV-XX" s... To provide a suitable model for AUV simulation and control purposes, a general nonlinear dynamic model including a novel thruster hydrodynamics model was derived. Based on the modeling method, the "AUV-XX" simulation platform was established to carry out fundamental tests on its motion characteristics, stability, and controllability. A motion control strategy consisting of both position and speed control in a horizontal plane was designed for different task assignments of underwater vehicles. Combined control of heave and pitch was adopted to compensate for the reduction of vertical tunnel thrusters when the vehicle is moving at a high speed. An improved S-surface controller based on the capacitor plate model was developed with flexible gain selections made possible by different forms of restricting the error and changing the rate of the error. Simulation results show that the derived general mathematical model together with simulation platform can provide a test bed for fundamental tests of motion control. Additionally, the capacitor plate model S-surface control shows a good performance in guiding the vehicle to achieve the desired position and speed with sufficient accuracy. 展开更多
关键词 AUV general dynamic model hydrodynamics modeling simulation platform motion control
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Hybrid Dynamic Modeling and Control of Molten Carbonate Fuel Cell Stack Shutdown
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作者 李勇 曹广益 朱新坚 《Journal of Donghua University(English Edition)》 EI CAS 2007年第1期35-38,共4页
A hybrid automaton modeling approach that incorporates state space partitioning, phase dynamic modeling and control law synthesis by control strategy is utilized to develop a hybrid automaton model of molten carbonate... A hybrid automaton modeling approach that incorporates state space partitioning, phase dynamic modeling and control law synthesis by control strategy is utilized to develop a hybrid automaton model of molten carbonate fuel cell (MCFC) stack shutdown. The shutdown operation is divided into several phases and their boundaries are decided according to a control strategy, which is a set of specifications about the dynamics of MCFC stack during shutdown. According to the control strategy, the specification of increasing stack temperature is satisfied in a phase that can be modeled accurately. The model for phase that has complex dynamic is approximated. The duration of this kind of phase is decreased to minimize the error caused by model approximation. 展开更多
关键词 MCFC fuel cell hybrid automaton control strategy shutdown.
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A New Control Strategy for Modeling Wind Energy Systems Using Fuzzy Cognitive Maps
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作者 Peter Groumpos Vaia Gkountroumani 《Journal of Energy and Power Engineering》 2014年第11期1859-1868,共10页
Wind energy is currently a fast-growing interdisciplinary field that encompasses many different branches of engineering and science. Modeling and controlling wind energy systems are difficult and challenging problems.... Wind energy is currently a fast-growing interdisciplinary field that encompasses many different branches of engineering and science. Modeling and controlling wind energy systems are difficult and challenging problems. The basic structure of wind turbines and some wind control system methods are briefly reviewed. The need for using advanced theories from fuzzy and intelligent systems in studying wind energy systems is identified and justified. FCMs (fuzzy cognitive maps) are used to model wind energy systems. Simulation studies are performed and obtained results are discussed. A new mathematical approach has been proposed to model dynamical complex systems, the DYFUKN (dynamic fuzzy knowledge networks). Many open problems in the areas of modeling and controlling wind energy systems are outlined. 展开更多
关键词 MODELING CONTROL energy systems wind generators fuzzy cognitive maps.
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A Review of Modeling Approaches and Tools for the Off-design Simulation of Organic Rankine Cycle 被引量:15
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作者 LIU Liuchen ZHU Tong +1 位作者 GAO Naiping GAN Zhongxue 《Journal of Thermal Science》 SCIE EI CAS CSCD 2018年第4期305-320,共16页
Organic Rankine Cycles(ORCs) are an effective way to produce electricity from low-grade heat sources, which cannot be effectively obtained using conventional high-temperature Rankine cycles. Due to the lack of availab... Organic Rankine Cycles(ORCs) are an effective way to produce electricity from low-grade heat sources, which cannot be effectively obtained using conventional high-temperature Rankine cycles. Due to the lack of available information regarding the real Organic Rankine Cycle units on industrial level, off-design simulation under diversified operating conditions plays a significant role for both the system performance prediction and control strategy design. This paper summarizes the theoretical basis, modeling approaches and tools for ORC off-design simulations. Firstly, a review was conducted on the individual state-of-the-art convective heat transfer correlations and void fraction models. Secondly, different kinds of modeling approaches and simulation tools were proposed, highlighting their relevant characteristics, and were categorized for their specific applications. Moreover, an in-depth analysis of technical challenges related to various applications and focusing on the model accuracy and complexity, computational efficiency, as well as the model compatibility were extensively described and discussed. Finally, the current research trends in this field and the development for further investigations were presented. 展开更多
关键词 Organic Rankine Cycle(ORC) low-grade heat modeling approach off-design
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MODELING STRATEGIES FOR CONTROLLING H1N1 OUTBREAKS IN CHINA
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作者 JIN ZHANG YANNI XIAO 《International Journal of Biomathematics》 2012年第4期63-81,共19页
There has been a global attack of A/H1N1 virus in 2009, which widely affected the world's normal stability and economic development. Since the emergence of the first diagnosed A/H1N1 influenza infected person in 11 M... There has been a global attack of A/H1N1 virus in 2009, which widely affected the world's normal stability and economic development. Since the emergence of the first diagnosed A/H1N1 influenza infected person in 11 May 2009 in China, very strict policy including quarantine and isolation measures were widely implemented to control the spread of this disease before the vaccine appeared. We propose a compartmental model that mimics the infection process of A/H1N1 under control strategies taken in China's Mainland. Apart from theoretical analysis, using the statistic data of Shaanxi Province, we estimated the unknown epidemiological parameters of this disease in Shaanxi via least-squares fitting method. The estimated control reproductive number of H1N1 for its first peak was Rc1 = 2.555 (95% CI: 2.362 2.748) and that for the second peak was Rc2 = 1.886 (95% CI: 1.765-2.001). Our findings in this paper suggest that neither quarantine nor isolation measures could be relaxed, and the implementation of these interventions can reduce the pandemic outbreak of A/H1N1 pandemic significantly. 展开更多
关键词 A/HIN1 influenza QUARANTINE ISOLATION least-squares fitting.
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