The invention discloses a transient modeling method for a
hydrogen circulating pump in a fuel
cell system, and the method comprises the steps: carrying out the fitting of a model based on a
polynomial regression method, obtaining a relation function of the flow, rotating speed and outlet pressure of the
hydrogen circulating pump,
coupling an
inertia link of a
drive motor, and constructing a complete transient centrifugal
hydrogen circulating pump model; and finally, performing PID control on the control
voltage of the driving motor, obtaining the
transient response of the hydrogen circulating pump through
coupling calculation of the three models, controlling the hydrogen circulating pump to meet the
tail gas recycling requirement of the fuel
cell stack, and therefore, the purpose of controlling the hydrogen circulating pump is achieved. The model obviously improves the calculation rate on the premise of ensuring the
simulation accuracy, can be used for calculating the working condition of the fuel
cell stack in a
steady state, can also simulate and calculate the real-time
transient response during the
variable load of the electric
pile under the actual road working condition, can better carry out linkage
simulation with the fuel
cell system, and the method has important significance for optimizing the control strategy of the fuel
cell system.