Power management method using feedback current bias for simultaneously controlling low cells and overall stack

A technology of stack voltage and fuel cell stack, which is applied in the direction of fuel cell, fuel cell control, fuel cell grouping, etc., and can solve problems such as reduction and excessive oscillation

Inactive Publication Date: 2009-11-18
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is then very prone to severe oscillations and / or excessive lowering

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  • Power management method using feedback current bias for simultaneously controlling low cells and overall stack
  • Power management method using feedback current bias for simultaneously controlling low cells and overall stack
  • Power management method using feedback current bias for simultaneously controlling low cells and overall stack

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Embodiment Construction

[0014] The following discussion of embodiments of the invention, which relate to a system and method, are merely exemplary in nature and intended in no way to limit the invention or its application or use To reduce and control the current output of the fuel cell stack in response to the stack voltage or minimum cell voltage falling below a predetermined voltage set point.

[0015] As will be discussed in detail below, the present invention proposes a method for reducing the allowable current output of the fuel cell stack if the stack voltage or the minimum cell voltage drops below a predetermined voltage set point, and then with The minimum cell voltage or stack voltage begins to recover, selectively increasing the allowable current output. The method includes reducing the allowed current output of the fuel cell stack to its present value as soon as the stack voltage or the minimum cell voltage reaches the voltage set point. Then, as the stack voltage or minimum cell voltage ...

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Abstract

The invention discloses a power management method using a feedback current bias for simultaneously controlling low cells and overall stack. A method for controlling the current output from a fuel cell stack to prevent the stack voltage or the minimum fuel cell voltage from dropping below predetermined voltage set-points. The method for the stack voltage control includes determining whether the stack voltage has dropped to the predetermined voltage set-point, and if so, capturing and holding the actual stack current at that point as the maximum allowed stack current. If the stack voltage continues to fall below the voltage set-point, then the voltage set-point is subtracted from the actual voltage to get a positive error signal. Controller gains are then multiplied by the error signal to reduce the current allowed from the stack to drive the error signal to zero, and increase the stack voltage. The method for the minimum fuel cell voltage operates in the same manner, but with different values.

Description

technical field [0001] The present invention relates generally to a method of controlling the output current of a fuel cell stack, and more particularly, to a method for, if the minimum cell voltage or the stack voltage falls below a predetermined voltage set point, The output current of the fuel cell stack is then reduced immediately, and the allowed current is increased in a controlled manner if the minimum cell voltage or stack voltage increases above the set point. Background technique [0002] Hydrogen is an attractive fuel because it is clean and can be used to efficiently generate electricity in fuel cells. A hydrogen fuel cell is an electrochemical device that includes an anode and a cathode with an electrolyte therebetween. The anode receives hydrogen and the cathode receives oxygen or air. Hydrogen dissociates in the anode to generate free hydrogen protons and electrons. Hydrogen protons flow through the electrolyte to the cathode. The hydrogen protons react wi...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H01M8/04H01M8/24
CPCH01M2008/1095H01M8/0491H01M8/04552Y02E60/50H01M8/04753H01M8/04559H01M8/04298
InventorD·A·阿瑟S·加纳帕蒂
OwnerGM GLOBAL TECH OPERATIONS LLC