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1.
In this paper, a 60 kW proton exchange membrane fuel cell (PEMFC) generation system is modeled in order to design the system
parameters and investigate the static and dynamic characteristics for control purposes. To achieve an overall system model,
the system is divided into five modules: the PEMFC stack (anode and cathode flows, membrane hydration, and stack voltage and
power), cathode air supply (air compressor, supply manifold, cooler, and humidifier), anode fuel supply (hydrogen valve and
humidifier), cathode exhaust exit (exit manifold and water return), and power conditioning (DC/DC and DC/AC) modules. Using
a combination of empirical and physical modeling techniques, the model is developed to set the operation conditions of current,
temperature, and cathode and anode gas flows and pressures, which have major impacts on system performance. The current model
is based on a 60 kW PEMFC power plant designed for residential applications and takes account of the electrochemical and thermal
aspects of chemical reactions within the stack as well as flows of reactants across the system. The simulation tests show
that the system model can represent the static and dynamic characteristics of a 60 kW PEMFC generation system, which is mathematically
simple for system parameters and control designs. 相似文献
2.
This paper presented a control design methodology for a proton exchange membrane fuel cell （PEMFC） generation system for residential applications. The dynamic behavior of the generation system is complex in such applications. A compre- hensive control design is very important for achieving a steady system operation and efficiency. The control strategy for a 60 kW generation system was proposed and tested based on the system dynamic model. A two-variable single neuron proportional-integral （PI） decoupling controller was developed for anode pressure and humidity by adjusting the hydrogen flow and water injection. A similar controller was developed for cathode pressure and humidity by adjusting the exhaust flow and water injection. The desired oxygen excess ratio was kept by a feedback controller based on the load current. An optimal seeking con- troller was used to trace the unique optimal power point. Two negative feedback controllers were used to provide AC power and a suitable voltage for residential loads by a power conditioning unit. Control simulation tests showed that 60 kW PEMFC generation system responded well for computer-simulated step changes in the load power demand. This control methodology for a 60 kW PEMFC generation system would be a competitive solution for system level designs such as parameter design, performance analysis, and online optimization. 相似文献
3.
燃料电池控制系统是质子交换膜燃料电池(PEMFC)的关键技术之一。电堆运行时,控制系统要能够根据实际运行状态提供合适的反应环境和相应的原料,以保证PEMFC工作的可靠性和高效性[1]。本文研制的5 kW的PEMFC控制系统,以ATMEGA64单片机为核心,配合OCMJ D系列液晶显示模块,实现了对PEMFC的氢气供给系统、空气供给系统、水冷系统以及并网供电系统的控制和检测,并且通过串行通信,实时地显示PEMFC的工作状态,建立了友好的人机操作界面。 相似文献
4.
Modelling and control PEMFC using fuzzy neural networks 总被引：1，自引：0，他引：1
INTRODUCTION With worldwide increase of air pollution and the environmental consciousness of governments,people have to look for new resources to mitigate the energy crisis and improve the present environmental status(Baschuk and Li,2000;Rowe and Li,2001).Fuel cells are highly efficient and environmentally clean electricity generators(Berning et al.,2002)that convert the chemical energy of a gaseous fuel directly into electrical energy and play an important role in solving the energy pro… 相似文献
5.
INTRODUCTION With worldwide increase of air pollution and the environmental consciousness of governments, people have to look for new resources to mitigate the energy crisis and improve the present environmental status (Ferng et al., 2004; Rowe and Li, 2001). Fuel cells are highly efficient and environmentally clean electrical generators (Mann et al., 2000) that convert the chemical energy of a gaseous fuel directly into elec-tricity energy and play an important role in solving the prob… 相似文献
6.
A power system with proton exchange membrane fuel cells (PEMFC) was designed for thermal underwater glider.Heat generated by PEMFC is used as the propulsion power of the glider,and the electricity is used in the control and sensor system.An electric energy storage system (ESS) is required which possesses high power density with good cycle life.Ultracapacitors which exhibit high power density and cycle life are considered as energy storage devices.Simulations based on a specific voyage condition indicate that ESS with ultracapacitors has positive effects on reducing the output power demand of PEMFC and lightening the power system.Experimental results show that the state of charge (SOC) is related to the capacitance and resistance in ultracapacitor ESS. 相似文献
7.
INTRODUCTION Fuel cells have attracted more attention in the last few years due to scarcity of the world energy source. The Proton Exchange Membrane Fuel Cell (PEMFC) is the focus of current development efforts because it is capable of higher power density and faster start-up than other fuel cells (Zhang et al., 2004). Research emphasis is on high power density with adequate energy conversion efficiency. PEMFC performance is related to many factors, among which electrolyte membrane … 相似文献
8.
Control design is important for proton exchange membrane fuel cell （PEMFC） generator. This work researched the anode system ofa 60-kW PEMFC generator. Both anode pressure and humidity must be maintained at ideal levels during steady operation. In view of characteristics and requirements of the system, a hybrid intelligent PID controller is designed specifically based on dynamic simulation. A single neuron PI controller is used for anode humidity by adjusting the water injection to the hydrogen cell. Another incremental PID controller, based on the diagonal recurrent neural network （DRNN） dynamic identification, is used to control anode pressure to be more stable and exact by adjusting the hydrogen flow rate. This control strategy can avoid the coupling problem of the PEMFC and achieve a more adaptive ability. Simulation results showed that the control strategy can maintain both anode humidity and pressure at ideal levels regardless of variable load, nonlinear dynamic and coupling characteristics of the system. This work will give some guides for further control design and applications of the total PEMFC generator. 相似文献
9.
该文在深入分析无线电能传输技术的传输特性及其磁耦合式传输工作原理的基础上,基于LCL-S型谐振耦合原理设计了一套大功率无线电能传输实验平台。首先,利用互感耦合模型对平面型系统机构进行了电路分析;其次,搭建了该实验平台的骨架构造;最后进行了实验测试,完成了双脉冲试验、开环控制带载试验和闭环控制带载试验等,分析了谐振频率对平台传输特性的影响。实验结果表明,该实验平台在工作频率为75 kHz时,输出功率可达30 kW,系统效率达到80%以上,稳定性良好,有效可行。 相似文献
10.
A bottoming cycle system based on CO2 Brayton cycle is proposed to recover the engine exhaust heat. Its performance is compared with the conventional air Brayton cycle under five typical engine conditions. The results show that CO2 Brayton cycle proves to be superior to the air Brayton cycle in terms of the system net output power, thermal efficiency and recovery efficiency. In most cases, the recovery efficiency of CO2 Brayton cycle can be higher than 9% and the system has a better performance at the engine’s high operating load. The thermal efficiency can be as large as 24.83% under 100% operating load, accordingly, the net output power of 14.86 kW is obtained. 相似文献
11.
To prevent the oxygen starvation and improve the system output performance, an adaptive inverse control (AIC) strategy is developed to regulate the air supply flow of a proton exchange membrane fuel cell (PEMFC) system in this paper.The PEMFC stack and the air supply system including a compressor and a supply manifold are modeled for the purpose of performance analysis and controller design. A recurrent fuzzy neural network (RFNN) is utilized to identify the inverse model of the controlled system and generates a suitable control input during the abrupt step change of external disturbances. Compared with the PI controller, numerical simulations are performed to validate the effectiveness and advantages of the proposed AIC strategy. 相似文献
12.
为了在缺少设计参数的条件下,设计一个非线性模型的热电联产故障诊断系统,提出了一种基于模糊神经网络的设计方法。通过分析热电联产控制系统各工作模块的工作过程,建立废热回收蒸汽锅炉、蒸汽集箱、汽吸收式冷凝器等模块工作模型。并采用粒子群优化算法对提出的模糊神经网络进行优化,假设模型和测量误差正常分布且相互独立,对模型置信区间进行了计算。实验测试表明,本文设计的故障检测具有较高的可信度。 相似文献
13.
LIU Cheng-ze ZHU Xin-jian 《浙江大学学报(A卷英文版)》2006,7(11):1878-1885
INTRODUCTION Proton Exchange Membrane Fuel Cell (PEMFC) is being rapidly developed in recent years because of its compact structure, light weight, low working temperature and rapid startup characteristics. But its E-I characteristic curve reveals its decreasing per- formance when confronted with suddenly increasing power demand, and high cost also restrains the ap- plication of the fuel cell. So the hybrid power scheme is the most suitable selection presently. Most of researches on fu… 相似文献
14.
WANG Rui-min CAO Guang-yi ZHU Xin-jian 《浙江大学学报(A卷英文版)》2007,8(5):741-747
Model and simulation are good tools for design optimization of fuel cell systems. This paper proposes a new hybrid model of proton exchange membrane fuel cell (PEMFC). The hybrid model includes physical component and black-box com-ponent. The physical component represents the well-known part of PEMFC, while artificial neural network (ANN) component estimates the poorly known part of PEMFC. The ANN model can compensate the performance of the physical model. This hybrid model is implemented on Matlab/Simulink software. The hybrid model shows better accuracy than that of the physical model and ANN model. Simulation results suggest that the hybrid model can be used as a suitable and accurate model for PEMFC. 相似文献
15.
介绍了一种应用于制冷空调领域的新型溶液除湿冷水机组,该系统可以由60～80℃的低品位热能驱动,如太阳能平板集热、余热废热等.对该系统建立了数学模型,理论分析了蒸发温度、再生温度、环境空气温湿度、封闭制冷循环和再生循环空气流量等参数对系统性能的影响.结果表明：系统在参考工况下制冷量为2.5kW,性能系数达0.37,制冷性能良好;再生温度和环境空气含湿量对系统制冷量和性能系数的影响较大,而环境空气温度的影响较小;同时,为了使得系统能够经济运行,再生空气流量不宜过大,而封闭制冷循环空气的流量也需要合理选择. 相似文献
16.
潘留仙 《湖南城市学院学报》1994,(6)
本文首先对处于热平衡状态的系统所定义的温度进行了较系统的介绍和评述。然后，根据相对论热力理论导出了相对论条件下的温度变换式。最后，对描述处于非平衡状态的系统所定义的广义温度概念进行了介绍。 相似文献
17.
质子交换膜燃料电池(PEMFC)电堆的温度是影响燃料电池性能的关键因素之一,建立电堆的热系统模型是准确控制电堆温度的基础。文章中利用反向传播(BP)神经网络对质子交换膜燃料电池的静态热系统进行建模。仿真结果表明,神经网络建模方法能够较好地拟合数据。 相似文献
18.
为延长电池使用寿命并在复杂工况环境下保证车辆的用电安全,在分析了温度对电池组性能的影响及热管理系统要实现的功能后,对电动汽车电池组热管理系统(BTMS)散热结构布局进行了改进。利用Fluent软件对多种结构方案进行模拟计算,比较了调整气流通道的间隔距离以及空气导流板与水平面夹角的结构变动对流速分布的影响,然后选出空气流速均匀性最好的结构方案。同时设计了BTMS的控制流程,即在低温下小电流充电预热,高温打开风机散热,并在系统过热时自动报警。最后,通过实验表明该方案能使电池温差控制在3℃以内,完全可满足日常的需求。 相似文献
19.
This paper discusses dynamic characteristics of proton exchange membrane fuel cell (PEMFC) under rapid fluctuation of power demand. Wavelet neural network is adopted in the identification of the characteristic curve to predict the voltage. The system control scheme of the voltage and power is introduced. The corresponding schemes for voltage and power control are studied. MATLAB is used to simulate the control system. The results reveal that the adopted control schemes can produce expected effects. Corresponding anti-disturbance and robustness simulation are also carried out. The simulation results show that the implemented control schemes have better robustness and adaptability. 相似文献
20.
发展了一种基于MATLAB和VB软件包的质子交换膜燃料电池(PEMFC)特性参数仿真实验软件。主要介绍了仿真软件的建模、设计方法和用户界面构成。仿真实验结果表明,该仿真软件可以满足PEMFC特性参数仿真实验教学的要求,为PEMFC特性参数的实验研究和实验教学与演示提供了一个有效工具。 相似文献