Voltage multi-model fusion control method for solid oxide fuel cell

Abstract

The invention discloses a voltage multi-model fusion control method for a solid oxide fuel cell (SOFC). The method has strong non-linear characteristics aiming at the SOFC system. Based on a plurality of typical load working conditions, a multi-model controller is designed. Through control of the fuel quantity input to the SOFC system, the constant voltage output of the system is controlled. Based on the proportion integration (PI) controller design under a plurality of typical working conditions, combined with the characteristic that the perturbation current of the system is measurable, according to the measured perturbation current, the multi-model controller realizes fusion of output controlled quality of each sub-controller to obtain fuel control quality to be input to the SOFC system. The method can maintain the stability of the output voltage of the solid oxide fuel cell system within the range of all working conditions, and raises the safety and economical efficiency of system operation.

Description

technical field [0001] The invention belongs to the technical field of thermal automatic control, and in particular relates to a voltage control method of a solid oxide fuel cell. Background technique [0002] In the actual operation of a solid oxide fuel cell (SOFC), it is often necessary to maintain a stable output voltage. However, the disturbance of external load changes often causes changes in the load current, which in turn will cause disturbances to the output voltage of the solid oxide fuel cell system. , is not conducive to the stable output of voltage. Generally speaking, the voltage output of the fuel cell can be controlled by controlling the amount of fuel entering the solid oxide fuel cell through a multi-model control method, and the disturbance of the load can be overcome. The basic idea of ​​the multi-model control method is to locally linearize the nonlinear system at multiple operating points, thereby dividing the nonlinear space into some subspaces. A co...

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Problems solved by technology

[0003] Purpose of the invention: Aiming at the above-mentioned prior art, a multi-model fusion control method for the solid oxide fuel cell voltage control system is proposed to solve the complexity of the sub-controller scheduling algorithm and scheduling problems in the traditional solid oxide fuel cell voltage multi-model control system. inaccurate question

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