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Fuel cell system output voltage control method

A fuel cell system and output voltage technology, which is applied in the direction of fuel cells, circuits, electrical components, etc., can solve the problems of increasing the volume and weight of the system, increasing the cost of the system, etc., and achieve the effect of large variation range and improved control accuracy

Active Publication Date: 2018-08-07
安徽明天氢能科技股份有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The use of DC / DC converter will not only increase the volume and weight of the system, but also increase the cost of the system

Method used

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Embodiment Construction

[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation examples. This implementation case is carried out on the premise of the technical solution of the present invention, and provides a detailed implementation, but the protection scope of the present invention is not limited to the following examples.

[0040] This embodiment provides a method for controlling the output voltage of a fuel cell system, such as figure 1 As shown, it includes two control variables, which are the air mass flow rate and the cathode air pressure into the stack. The two parameters use different control methods to control the output voltage of the fuel cell system. By controlling these two variables, the fuel The output voltage of the battery varies around a desired value.

[0041] Such as figure 1 Shown is a schematic diagram of the system control strategy of the present invention; figure 2 It is a schematic diagram...

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Abstract

The invention discloses a fuel cell system output voltage control method. The method includes: acquiring the real-time output voltage of a fuel cell system; inputting an expected voltage value and a measured voltage value into a constant-voltage control operation unit to obtain a negative electrode pressure value and an excess coefficient correction value respectively; using a feed-forward table to find out a corresponding excess coefficient according to the input currents of the fuel cell system; adding the excess coefficient correction value outputted by the constant-voltage control operation unit to the found excess coefficient; inputting the excess coefficient into a converter to obtain mass air flow; inputting two variables including the mass air flow and negative electrode pressure into a multivariable closed-loop control operation unit to obtain air compressor rotating speed and counterbalance valve openness; inputting the air compressor rotating speed and counterbalance valve openness serving as input parameters into the fuel cell system to obtain fuel cell output voltage, mass air flow and negative electrode pressure; feeding fuel cell output parameters to control units toform closed-loop control.

Description

technical field [0001] The invention relates to the technical field of fuel cell system control, in particular to a method for controlling the output voltage of a fuel cell system. Background technique [0002] A fuel cell is a power generating device that directly converts the chemical energy of fuel into direct current electrical energy. Its working principle is to convert the chemical energy of substances into electrical energy through electrochemical reactions, and the materials required for the fuel cell chemical reaction are continuously replenished from the outside. As long as the fuel is supplied, the energy will continuously output electrical energy and heat energy. In short, a fuel cell is an energy conversion device. [0003] The voltage provided by the fuel cell is affected by factors such as the stack input air excess coefficient, air supply pressure, stack temperature, and stack humidity. Generally speaking, the former two are easy to adjust and the process is...

Claims

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Application Information

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IPC IPC(8): H01M8/04858H01M8/04992
CPCH01M8/0488H01M8/04992Y02E60/50
Inventor 裘瑾英王朝云霍亮刘士广吴炎花宁可望
Owner 安徽明天氢能科技股份有限公司
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