An adaptive decoupling control method for fuel cell air supply system
A technology of air supply and decoupling control, applied in adaptive control, fuel cells, electrical components, etc., can solve problems such as weak disturbance suppression, limited system dynamic performance, etc., and achieve excellent environmental adaptability and stability margin requirements. Reduced effects with a wide range of parameters
Active Publication Date: 2022-06-24
绍兴学森能源科技有限公司
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[0006] The decoupling objects of the above two documents are all physical processes from speed, opening to mass flow and pressure. In practical applications, the suppression of disturbances such as altitude and ambient temperature is not strong, which limits the dynamic performance of the system.
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[0044] In order to make those skilled in the art better understand the solution of the present invention, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.
[0045] like figure 1 An adaptive decoupling control method for a fuel cell air supply system is shown, the method comprises the following steps:
[0046] 1) The nonlinear characteristics of the air supply system are obtained through system identification:
[0047]
[0048] where d is the differential operator, Q ca is the air volume flow, r ca is the ratio of cathode to ambient pressure, N AC is the air compressor speed, α bpv is the back pressure valve opening. The system is characterized from the opening of the back pressure valve, the speed of the air compressor to the volume flow and pressure ratio, and has strong robustness and adaptability to working conditions, which greatly reduces the workload of system identification.
[0049] 2) Design ...
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The invention discloses an adaptive decoupling control method of a fuel cell air supply system, which is used to realize the decoupling control of the flow pressure of the fuel cell air supply system in different environments. The control method includes expected signal preprocessing and PID feedback control Steps such as controller, decoupling controller, sensor signal processing, etc., the expected signal preprocessing is used to convert the expected mass flow and pressure signals into volume flow and pressure ratio signals, and the PID feedback controller passes the volume flow error, pressure ratio Errors are obtained from the values of the control quantities of the flow control loop and the pressure control loop respectively, and the cathode pressure of the fuel cell is adjusted relatively independently through the decoupling controller, and the sensor signal processing is used to feed back the mass flow rate and pressure of the fuel cell system The signal is converted into a volume flow, pressure ratio signal. Compared with the prior art, the invention has the advantages of strong environmental adaptability, good dynamic tracking performance, convenient controller design and the like.
Description
technical field [0001] The invention relates to the technical field of fuel cell systems, in particular to an adaptive decoupling control method for a fuel cell air supply system. Background technique [0002] Hydrogen fuel cells use the electrochemical reaction of hydrogen and oxygen to generate electricity to provide power for vehicles. It has the characteristics of zero emission, no pollution, and high energy utilization rate. [0003] The electrochemical reaction of fuel cells requires sufficient oxygen, so an air supply system is needed as an auxiliary. The air supply system generally includes components such as air compressor, back pressure valve, and intercooler, which have the characteristics of flow and pressure coupling. The coupling characteristics of the fuel cell air supply system are likely to cause problems such as overshoot and large fluctuations in the control process, which limit the performance of the system. [0004] The paper document 1 (ISSN: 0253-374...
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IPC IPC(8): G05B13/04H01M8/04746
CPCG05B13/042H01M8/04753Y02E60/50
Inventor 焦杰然张卫东张曙殷园陈立华
Owner 绍兴学森能源科技有限公司