Control method for two degrees of freedom (2DOF) of proton exchange membrane type fuel cell (PEMFC) system based on optimal oxygen enhancement ratio (OER)
A fuel cell system, proton exchange membrane technology, applied in the direction of fuel cells, fuel cell additives, adaptive control, etc., can solve the problems of ignoring the perturbation of system parameters, ignoring the optimal OER trajectory, and failing to achieve output power, etc., to achieve Solve robust stability and robust performance, overcome the problem of ignoring robustness, and improve the effect of net output power
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Embodiment 1
[0077] A kind of embodiment of the present invention is: based on the optimal OER PEMFC system 2DOF method, its approach is:
[0078] A. Optimal OER analysis based on PEMFC system
[0079] For PEMFC system, its net output power P net It is determined by the output power of the PEMFC stack and the parasitic power, and the parasitic power is mainly generated by the air compressor. OER indicates the oxygen supply status of the PEMFC system and is the main index to measure the power generation performance of the system. Define OER as the oxygen mass flow rate F supplied by the cathode inlet O2,in and the consumed oxygen mass flow rate F O2,ret Ratio:
[0080] OER = F O 2 , in F O 2 , ret ...
Embodiment 2
[0128] This example is basically the same as Embodiment 1, the difference is: a single FFC is used to track the optimal OER trajectory of the PEMFC system, and the method is:
[0129] A feed-forward control strategy is used to compensate I st The impact of dynamic changes. When there is a fast dynamic external disturbance, using the controlled variable v cm with I st The functional relationship can design an effective FFC. The present invention adopts the polynomial fitting technique based on Vandermonde matrix QR decomposition to obtain v cm,op with I st The functional relationship between the realized P net maximization, such as image 3 shown. Through the optimal nonlinear relationship diagram, the functional relationship of the following form can be determined:
[0130] v cm,op = f 1 (I st )
[0131] However, the defect of FFC is that due to its open-loop system structure, the control effect on the transient response is poor.
[0132] The present invention is ...
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