Fuel cell air peroxide ratio and flow pressure cooperative control method and system
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An air peroxygen ratio, fuel cell technology, applied in the direction of fuel cell control, fuel cell, fuel cell additives, etc., can solve the problems of only considering, failing to effectively control pressure, not considering, etc.
Active Publication Date: 2020-06-26
TONGJI UNIV
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Problems solved by technology
[0005] The patent is mainly to collect the fuel cell reactor current, and calculate the oxygen peroxide ratio and net power output of the fuel cell at a certain current according to the relevant formula, and then obtain the optimal oxygen peroxide ratio when the net power output is the maximum, and then generate the result according to the control formula The voltage of the air compressor motor is required. It is the key of the present invention to control the oxygen ratio through the air compressor voltage. It only considers the air flow and does not consider the influence of the air flow on the pressure, and the pressure cannot be effectively controlled.
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Embodiment 1
[0130] A fuel cell air oxygen ratio and flow pressure cooperative control method, such as figure 1 and figure 2 ,include:
[0131] Experiments are carried out through the fuel cell air supply system, and the actual measurement obtains the reference value of the peroxygen ratio The actual value of the air flow and the actual value of the cathode pressure of the fuel cell are respectively detected by the air flow meter and the pressure sensor, and the set value of the cathode pressure is input;
[0132] The fuel cell air compressor speed and back pressure valve opening are controlled by a second-order sliding mode controller and a PID neural network decoupling controller. The specific steps are as follows:
[0133] 1) Will Compared with the actual value of peroxygen The difference is input into the second-order sliding mode controller to obtain the air flow reference value;
[0134] 2) Input the air flow reference value, air flow actual value, cathode pressure set value...
Embodiment 2
[0188] A fuel cell air oxygen ratio and flow pressure cooperative control system, comprising:
[0189] The simulation verification module is used to establish the simulation model of the fuel cell air supply system and use the model to conduct experiments to obtain the reference value of the oxygen ratio
[0190] sliding mode control module for the Compared with the actual value of peroxygen The difference is input into the second-order sliding mode controller to obtain the air flow reference value;
[0191] The decoupling control module is used to input the air flow reference value, air flow actual value, cathode pressure set value and cathode pressure actual value into the PID neural network decoupling controller, and output the speed of the air compressor and the opening of the back pressure valve;
[0192] Among them, the fuel cell air supply system simulation model is built based on Matlab Simulink and includes cathode gas dynamic model, air compressor dynamic model...
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Abstract
The invention relates to a fuel cell air peroxide ratio and flow pressure cooperative control method and system. The method comprises the following steps: carrying out an experiment through a fuel cell air supply system, carrying out actual measurement to obtain a peroxide ratio reference value, respectively detecting an air flow actual value and a cathode pressure actual value of a fuel cell through an air flow meter and a pressure sensor, and setting a cathode pressure set value; controlling the rotating speed of an air compressor of a fuel cell and the opening degree of a back pressure valve through a second-order sliding mode controller and a PID neural network decoupling controller, specifically including the steps: inputting the difference with an actual peroxide ratio value into thesecond-order sliding mode controller, and acquiring an air flow reference value; inputting the air flow reference value, the air flow actual value, the cathode pressure set value and the cathode pressure actual value are input into a PID neural network decoupling controller, and outputting the rotating speed of the air compressor and the opening degree of a back pressure valve. Compared with theprior art, the method has the advantages of prolonged service life, good safety and the like.
Description
technical field [0001] The invention relates to the technical field of fuel cells, in particular to a method and system for synergistically controlling the air oxygen ratio and flow pressure of a fuel cell. Background technique [0002] In the context of advocating energy conservation and environmental protection, the development of new energy vehicles has become a common choice for the automotive industry to deal with energy and environmental crises. Fuel cells efficiently generate electricity from chemical fuels through electrochemical reactions with oxidants, with very few pollutants and high efficiency, and only need to provide the required hydrogen and oxygen systems to continuously supply energy. Fuel cells have the advantages of light weight, high power density, and good stability. Their low operating temperature and ability to start quickly at low temperatures are currently the most promising fuel cell technology, and they are very suitable as vehicle engines. [00...
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