For environment protection and high efficiency, development of new conceptpower plant has been required in China. The fuel cell is expected to be used in a power plant as acentralized power Station or distributed powe...For environment protection and high efficiency, development of new conceptpower plant has been required in China. The fuel cell is expected to be used in a power plant as acentralized power Station or distributed power plant. It is a chemical power generation device thatconverts the energy of a chemical reaction directly into electrical energy and not limited by Carnotcycle efficiency. The molten carbonate fuel cell (MCFC) power plant has several attractive featuresi.e. high efficiency and lower emission of NO_x and SO_x A combined cycle generation system withMCFC and steam turbine is designed. Its net electrical efficiency LHV is about 55 percent.展开更多
A kind of fault diagnosis system of molten carbonate fuel cell (MCFC) stack is proposed in this paper. It is composed of a fuzzy neural network (FNN) and a fault diagnosis element. FNN is able to deal with the informa...A kind of fault diagnosis system of molten carbonate fuel cell (MCFC) stack is proposed in this paper. It is composed of a fuzzy neural network (FNN) and a fault diagnosis element. FNN is able to deal with the information of the expert knowledge and the experiment data efficiently. It also has the ability to approximate any smooth system. FNN is used to identify the fault diagnosis model of MCFC stack. The fuzzy fault decision element can diagnose the state of the MCFC generating system, normal or fault, and can decide the type of the fault based on the outputs of FNN model and the MCFC system. Some simulation experiment results are demonstrated in this paper.展开更多
The stability of control systems described by fractional-order transfer function form is mainly investigated. The stability analysis of integer-order linear systems was extended to the fractional-order control systems...The stability of control systems described by fractional-order transfer function form is mainly investigated. The stability analysis of integer-order linear systems was extended to the fractional-order control systems. The stability definition of fractional-order linear control systems is presented in terms of the Lyapunov's stability theory. Using the theorems of the Mittag-Leffler function in two parameters directly derives the stability conclusion. The illustrative examples are also given by simulation results.展开更多
The operating temperature of PEMFC stack is a very important control parameter. In operating process, electro-chemical reaction and the humidity of proton exchange membrane vary sensibly with it, the variation of oper...The operating temperature of PEMFC stack is a very important control parameter. In operating process, electro-chemical reaction and the humidity of proton exchange membrane vary sensibly with it, the variation of operating temperature has a significant influence on the output performance and lifespan of fuel cells. The most existing PEMFC mathematical models are too complicated to apply in on-line control process, so it is necessary to find a simple accurate stable control method. In this paper, a novel genetic algorithm (NGA) is presented, which possesses stronger global searching and local optimizing capacities than SGA. NGA is applied to optimize rapidly the weights of neural network according to the population of excellent individuals, neural networks technique is used to establish a self-adjusted control model for PEMFC system. The results of simulation and experiment are given in the end.展开更多
基金This project is supported by National Natural Science Foundation of China (No.50206012).
文摘For environment protection and high efficiency, development of new conceptpower plant has been required in China. The fuel cell is expected to be used in a power plant as acentralized power Station or distributed power plant. It is a chemical power generation device thatconverts the energy of a chemical reaction directly into electrical energy and not limited by Carnotcycle efficiency. The molten carbonate fuel cell (MCFC) power plant has several attractive featuresi.e. high efficiency and lower emission of NO_x and SO_x A combined cycle generation system withMCFC and steam turbine is designed. Its net electrical efficiency LHV is about 55 percent.
文摘A kind of fault diagnosis system of molten carbonate fuel cell (MCFC) stack is proposed in this paper. It is composed of a fuzzy neural network (FNN) and a fault diagnosis element. FNN is able to deal with the information of the expert knowledge and the experiment data efficiently. It also has the ability to approximate any smooth system. FNN is used to identify the fault diagnosis model of MCFC stack. The fuzzy fault decision element can diagnose the state of the MCFC generating system, normal or fault, and can decide the type of the fault based on the outputs of FNN model and the MCFC system. Some simulation experiment results are demonstrated in this paper.
文摘The stability of control systems described by fractional-order transfer function form is mainly investigated. The stability analysis of integer-order linear systems was extended to the fractional-order control systems. The stability definition of fractional-order linear control systems is presented in terms of the Lyapunov's stability theory. Using the theorems of the Mittag-Leffler function in two parameters directly derives the stability conclusion. The illustrative examples are also given by simulation results.
文摘The operating temperature of PEMFC stack is a very important control parameter. In operating process, electro-chemical reaction and the humidity of proton exchange membrane vary sensibly with it, the variation of operating temperature has a significant influence on the output performance and lifespan of fuel cells. The most existing PEMFC mathematical models are too complicated to apply in on-line control process, so it is necessary to find a simple accurate stable control method. In this paper, a novel genetic algorithm (NGA) is presented, which possesses stronger global searching and local optimizing capacities than SGA. NGA is applied to optimize rapidly the weights of neural network according to the population of excellent individuals, neural networks technique is used to establish a self-adjusted control model for PEMFC system. The results of simulation and experiment are given in the end.
