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

Inactive Publication Date: 2012-06-27
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These control methods are only designed based on the dynamic model of the oxygen deficiency problem, and only consider the phenomenon of oxygen deficiency, so the control target is generally set as the OER constant value as the minimum limit value to avoid oxygen deficiency, ignoring the optimal OER The existence of the trajectory, the maximum net output power cannot be achieved
Moreover, the above control strategy does not fully consider the influence of uncertainty and external disturbance on the PEMFC system in the actual working process, such as ignoring the perturbation of system parameters caused by environmental changes and nonlinear characteristics.
Therefore, the designed controller does not have good immunity and robustness

Method used

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  • Control method for two degrees of freedom (2DOF) of proton exchange membrane type fuel cell (PEMFC) system based on optimal oxygen enhancement ratio (OER)
  • Control method for two degrees of freedom (2DOF) of proton exchange membrane type fuel cell (PEMFC) system based on optimal oxygen enhancement ratio (OER)
  • Control method for two degrees of freedom (2DOF) of proton exchange membrane type fuel cell (PEMFC) system based on optimal oxygen enhancement ratio (OER)

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a control method for two degrees of freedom (2DOF) of proton exchange membrane type fuel cell (PEMFC) system based on an optimal oxygen enhancement ratio (OER). According to the control method, an H-order supreme feedback control (HSFC) method and a feedforward control (FFC) method are combined, a variable to be controlled via dual functions of the two methods, wherein the HSFC method adopts a linear matrix inequality (LMI) method for solution, and FFC adopts a polynomial fitting technique based on the QR (orthogonal matrix / upper triangular matrix) decomposition of the Vandermonde matrix for design. By adopting the control method, the optimal OER trajectory of the system can be tracked under conditions with large load current fluctuations, parameter perturbation and environmental interference noise, the parasitic power consumption of the system can be reduced, and the net output power of the system can be improved. Moreover, the method has good robustness and reasonable servo control behaviors, and the optimal OER and the maximum net output power of the system can be ensured.

Description

technical field [0001] The invention relates to fuel cell technology, in particular to the technical field of a control method for a proton exchange membrane fuel cell system. Background technique [0002] With the emergence of global warming, fuel cell technology is regarded as a promising energy technology due to its high efficiency and environmental friendliness. Compared with other types of fuel cells, Proton Exchange Membrane Fuel Cell (PEMFC) has the advantages of low operating temperature, high power density, fast response, good stability, and no environmental pollution when using pure hydrogen. Features, suitable for portable power sources, hybrid vehicles and distributed power generation. PEMFC power generation system is a strongly coupled, nonlinear complex dynamic system. When the driven load changes, the stack current will change accordingly. If the cathode oxygen flow rate is too low, the system will reduce its output power due to insufficient oxygen supply, ...

Claims

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Application Information

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IPC IPC(8): G05B13/02H01M8/04H01M8/04089
CPCY02E60/50
Inventor 李奇陈维荣刘述奎王砚帛游志宇陶诗涌李艳昆王珂冯肯张瀚月田维民焦哲
Owner SOUTHWEST JIAOTONG UNIV
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