Self-breathing fuel cell temperature control method based on multiple internal models

Abstract

The invention discloses a self-breathing fuel cell temperature control method based on multiple internal models. The method considers the nonlinear characteristics of a fuel cell system, adopts a system nominal model combination under multiple working conditions to obtain a global nominal model, and can realize a good control effect under all working conditions. Meanwhile, accurate temperature following control of the self-breathing fuel cell is achieved, sufficient supply of air needed by reaction of the fuel cell is guaranteed, high steady-state precision and good dynamic tracking performance are achieved, it can be guaranteed that the fuel cell works in a good working state under all current working conditions, good output performance and longer service life are achieved, the rapidity, accuracy and robustness of the control effect are guaranteed by reasonably designing a control strategy, and internal and external disturbance is fully inhibited.

Description

technical field [0001] The invention relates to the technical field of fuel cell system control, in particular to a self-breathing fuel cell temperature control method based on multiple internal models. Background technique [0002] Proton exchange membrane fuel cell is a kind of electrochemical power generation device. According to different cooling methods, it is mainly divided into air-cooled and water-cooled fuel cells. Air-cooled fuel cells have a simpler structure and are suitable for some applications with relatively low power requirements, also known as self-breathing fuel cells. In order to ensure better performance, generally self-breathing fuel cells are equipped with cooling fans. By using cooling fans, the functions of air supply and stack cooling are combined, and an open cathode flow channel is designed to cause The air flow can take away the excess heat generated by the stack, realize effective cooling of the stack, and at the same time realize sufficient ai...

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Problems solved by technology

[0005] However, Patent Document 1 does not implement temperature following control, and adopts the same target temperature value for different current conditions, which cannot guarantee a better output of the stack Performance and life; Paper 1 does not consider the control of the amount of air supplied. Under the condition of low current and current rise, the fan speed required for heat dissipation is low. At this time, it may cause fuel cell oxygen starvation

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