PEMFC electric pile temperature control method and system

Abstract

The invention discloses a PEMFC electric pile temperature control method and system. The PEMFC electric pile temperature control method comprises the steps of: acquiring a volt-ampere characteristic curve of a PEMFC electric pile model, and enabling the target optimal temperature under different current values to serve as an initial temperature value; regulating and controlling PID control parameters of the PEMFC stack model according to the gain change rate of the PEMFC stack inlet and outlet temperature relative to the PEMFC stack state change at the adjacent moment and the target current value; and controlling the inlet and outlet temperature of the PEMFC stack according to the PID control parameter and the initial temperature value. A model prediction control method and a PID parameter adjustment method are adopted to accurately control the output value of the inlet and outlet temperature of the PEMFC stack, temperature oscillation is reduced, the hysteresis quality of temperature control is solved, short-time high temperature in the PEMFC stack is avoided, and the real-time performance of temperature control is improved.

Description

technical field [0001] The invention relates to the technical field of fuel cell temperature control, in particular to a PEMFC stack temperature control method and system. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] As a new energy technology, fuel cell technology has been paid more and more attention all over the world. Among them, the proton exchange membrane fuel cell PEMFC has been popularized and applied in new energy vehicles and distributed power stations due to its fast start-stop speed, high power density, good loading response, environmental protection and zero emissions. [0004] However, the inventors found that in the PEMFC control technology, especially in the temperature control technology, the PEMFC is used for a long time, and the PEMFC stack is dynamically loaded with a large current, the excess heat inside the stack...

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Problems solved by technology

[0004] However, the inventors found that in the PEMFC control technology, especially in the temperature control technology, the PEMFC is used for a long time, and the PEMFC stack is dynamically loaded with a large current, the excess heat inside the stack cannot be discharged in time, resulting in the internal temperature of the PEMFC stack If the internal temperature of the PEMFC stack exceeds the tolerance of the proton exchange membrane, it will seriously affect the service life of the PEMFC; for the temperature control method of the PEMFC stack, the traditional PEMFC fuel cell system lags behind in temperature control when the power is loaded. , it is prone to the problem of excessive temperature difference between the inlet and outlet, which affects the service life and cannot effectively guarantee the reliable operation of the PEMFC system

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