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李前卫 《能源技术(上海)》2003,24(4):173-177
文章总结模糊控制JSQ20-B10强排热水器的成功实践。对模糊控制恒温型燃气热水器的硬件要点及模糊控制规则、推理流程、反模糊化作了较详细的论述。 相似文献
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在GT-SUITE中建立了一维重型柴油机瞬态冷却系统仿真模型,并对冷却系统控制策略的开发方法和控制效果进行了研究。以降低冷却系统附件最小功耗及提高冷却液温度控制精度为目标,分别设计了脉谱前馈与模糊控制、变论域模糊控制、变论域模糊控制加水泵比例积分控制3种控制策略,并在全球统一瞬态试验循环工况下进行发动机台架工况与整车车辆运行工况的仿真计算对比。研究结果表明:相比模糊控制,反馈采用变论域模糊控制能使发动机出口冷却液温度振幅减少37.6%,温度处于±0.5℃区间内的时间增加39.98%,且附件总能耗降低8.58%,冷却性能得到明显改善;额外采用水泵比例积分控制能使发动机出口冷却液温度振幅进一步减少16.1%,温度处于±0.5℃区间内的时间增加15.26%,但附件总能耗相比提高10.3%,提高温控精度但牺牲了附件的功耗。脉谱前馈与变论域模糊控制在温控精度与功耗优化方面整体表现最优,整车运行环境下温控精度相比模糊控制提高49.28%,同时功耗降低8.68%。 相似文献
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针对感应加热电源温度控制,采用了一种新型模糊控制控制器,介绍了基于该模糊控制的感应加热温度控制系统的构成及其设计。通过MATLAB/SIMULINK进行了仿真,仿真结果验证了该温度控制系统的有效性和优越性。 相似文献
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提出一种以模糊理论为基础的细化模糊控制方法,它把人们在实践中得到的控制经验变成模糊控制规则,再把这些规则经模糊推理和决策得到控制变量。实践证明,细化模糊控制质量高于一般模糊控制方法。 相似文献
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针对电力系统短期负荷预测,综合考虑温度、日期类型和天气等因素对短期电力负荷的影响,建立了径向基函数(Radial?Basis?Function,RBF)神经网络和模糊控制相结合的短期负荷预测模型。该模型利用RBF神经网络的非线性逼近能力对预测日负荷进行了预测,并采用在线自调整因子的模糊控制对预测误差进行在线智能修正。实际算例表明RBF神经网络与模糊控制相结合提高了预测精度。 相似文献
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《Energy Conversion and Management》2005,46(7-8):1305-1318
In this paper, a class of microelectromechanical systems described by nonlinear differential equations with random delays is examined. Robust fuzzy controllers are designed to control the energy conversion processes with the ultimate objective to guarantee optimal achievable performance. The fuzzy rule base used consists of a collection of r fuzzy IF-THEN rules defined as a function of the conditional variable. The method of the theory of cones and Lyapunov functionals is used to design a class of local fuzzy control laws. A verifiably sufficient condition for stochastic stability of fuzzy stochastic microelectromechanical systems is given. As an example, we have considered the design of a fuzzy control law for an electrostatic micromotor. 相似文献
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利用模糊控制的快速动态响应和PID控制的稳态性能,设计了模糊自适应PID控制算法,实现了对燃气轮机转速的快速跟踪及稳态控制。仿真试验和工程应用均表明该控制算法的响应时间和稳态精度比常规控制算法有明显改善。 相似文献
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Zhen Yu 《Solar Energy》2010,84(4):538-548
A hierarchical fuzzy supervisory controller is described that is capable of optimizing the operation of a low-energy building, which uses solar energy to heat and cool its interior spaces. The highest level fuzzy rules choose the most appropriate set of lower level rules according to the weather and occupancy information; the second level fuzzy rules determine an optimal energy profile and the overall modes of operation of the heating, ventilating and air-conditioning system (HVAC); the third level fuzzy rules select the mode of operation of specific equipment, and assign schedules to the local controllers so that the optimal energy profile can be achieved in the most efficient way. Computer simulation is used to compare the hierarchical fuzzy control scheme with a supervisory control scheme based on expert rules. The performance is evaluated by comparing the energy consumption and thermal comfort. 相似文献
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以具有非线性和非最小相位特性的水轮发电机调速系统为例.提出了T—S模糊控制器设计的新方法——基于PID控制器知识样本的T—S模糊控制器设计方法。将模糊控制器运用于水轮机控制。并对其进行仿真,把得到的模糊控制响应曲线与PID控制器进行比较,从调节时间、超调量、鲁棒性等方面可以看出,模糊控制器控制效果要优于PID控制。 相似文献
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采用模糊算法编制压差控制系统的内部算法,用模糊算法实现对空调水系统的智能控制,详细给出模糊控制系统的设计步骤,并通过对中央空调系统特性数据的监测,验证了该技术的可行性。 相似文献
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《Energy Conversion and Management》2005,46(11-12):1757-1766
In addition to absorption chillers, today’s gas cooling technology includes gas engine driven heat pump systems (GEHP) in a range of capacities and temperature capacities suitable for most commercial air conditioning and refrigeration applications. Much is expected from GEHPs as a product that would help satisfy the air conditioning system demand from medium and small sized buildings, restrict electric power demand peaks in summer and save energy in general. This article describes a kind of control strategy for a GEHP, a cascade fuzzy control. GEHPs have large and varying time constants and their dynamic modeling cannot be easily achieved. A cascade control strategy is effective for systems that have large time constants and disturbances, and a fuzzy control strategy is fit for a system that lacks an accurate model. This cascade fuzzy control structure brings together the best merits of fuzzy control and cascade control structures. The performance of the cascade fuzzy control is compared to that of a cascade PI (proportional and integral) control strategy, and it is shown by example that the cascade fuzzy control strategy gives a better performance, reduced reaction time and smaller overshoot temperature. 相似文献