Air terminal control method of a fuel cell system
A fuel cell system and control method technology, applied in fuel cell additives, etc., can solve the problems of slow system dynamic response, long response time, loss of available electric energy, etc., and achieve the effects of faster response and improved system efficiency
Active Publication Date: 2014-09-17
SHANGHAI CHONGSU ENERGY TECH CO LTD
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Problems solved by technology
The other is to properly adjust the demand current through the load regulator (Load Governor) to ensure that the fuel cell system will not experience "oxygen deficiency". However, this adjustment method has a longer response time and a slower system dynamic response.
When the current demand of the fuel cell system suddenly decreases, the management of the air end of the system is usually to directly reduce the control voltage of the air compressor to the voltage value corresponding to the new current demand, resulting in the loss of a part of the available electric energy due to the unused remaining air
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[0029] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.
[0030] The fuel cell system is mainly composed of a fuel cell stack, a hydrogen supply system, an oxygen supply system, a humidification system and a cooling system, and a DC / DC converter is used as a current regulating device.
[0031] When the current demand is driven by I old increase to I dem , that is, when the main controller (such as the vehicle controller) generates a large demand current signal, keep other inputs of the system unchanged, and predict the current demand current I according to the dynamic model of the fuel cell system designed in the prior art dem Whether it will cause "hypoxia" in the system. If it is predicted by the dynamic model of the fuel cell system that there will be no "oxygen deficiency", the DC / DC converter will take the required current as the current control target value and directly apply it to the fuel ce...
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The invention discloses an air terminal control method of a fuel cell system. When required current is increased from Iold to Idem, whether the current required current Idem causes ''hypoxia'' of the system is judged. If so, the current required current Idem current is reduced to critical current value Icrit. Otherwise, the current required current Idem is used as a target value for current control and is directly applied to a fuel cell stack. When the required current is reduced from Iold to Idem, other inputs of the system retain unchanged, control voltage of an air compressor is directly reduced to a voltage value corresponding to the current required current Idem, and the current Ist is pulled according to air mass flow. By the adoption of the control method, response time can be accelerated, air mass flow can be fully utilized, and system efficiency is raised.
Description
technical field [0001] The invention belongs to the field of fuel cells, and relates to air terminal management and current regulation of a fuel cell system. Background technique [0002] At present, when the current demand of the fuel cell system (the so-called "demand current" refers to the output current demand of the power drive system for the fuel cell system) suddenly increases, the management of the air end of the system is mainly divided into two strategies: one is to Changes in current are seen as external disturbances, not input variables, and the current is not regulated. Due to the slow dynamic response speed of the air end of this control strategy, the air volume provided is less than the required air volume, resulting in "hypoxia" phenomenon. The other is to properly adjust the demand current through the load regulator (Load Governor) to ensure that the fuel cell system will not experience "oxygen deficiency". However, this adjustment method has a longer respo...
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IPC IPC(8): H01M8/04
CPCY02E60/50
Inventor 周苏纪光霁刘冀晨章桐
Owner SHANGHAI CHONGSU ENERGY TECH CO LTD