| Proton Exchange Membrane Fuel Cell (PEMFC) now is a new energy technology which has the most potential for development. It has many advantages, such as efficient, clean and safe.The study for dynamic electrical characteristics of PEMFC system plays a vital role on cell design optimization and practical application. When the load current, the quantity of response gas or ambient temperature changes, it is a key indicator to measure the performance of the entire control system that output voltage of PEMFC can respond rapidly without any steady-state errors. What's more, the stack temperature of PEMFC should be controlled in an optimum point. And voltage drop must be avoided once the operating conditions change suddenly. Otherwise the operating efficient and service life of the cell will be affected. So it is essential to find out a suitable control way to make PEMFC system run steady and reliably. The main work done of this paper is summarized as follows:(1)Introduce background sources and application development of the fuel cell firstly. Then briefly explain the research status and development trend of the cell, stack model, control algorithm and PEMFC measurement and control system.(2)Firstly, under energy conservation, heat distribution, electrochemical theory and voltage dynamic characteristics inside the stack, a temperature model and a voltage model of the fuel cell stack were separately developed. Integrate the two separate models to form a more complete dynamic model. Finally, MATLAB/Simulink software was used to develop and emulate the model. By referring to the experimental data, the simulation result indicates that the models can well reflect the actual working conditions of PEMFC system.(3)Acquire the relationship between the corresponding input and output from the above model. Then based on a modified generalized predictive control algorithm (MGPC), predictive control schemes of PEMFC temperature and voltage were proposed in this paper. Ensure that the cell has a high output efficiency and the electrical characteristics can fast response and stability changes. The simulation result indicates that the control system can deliver idealer effects.(4) Expound the framework of the PEMFC measurement and control system in turn. Besides, the control of electromagnetic valve opening and closing time was supplemented. Implemented testing and analysis of the PEMFC output performance, and the V-I and P-I dynamic curves were obtained. |
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