A multi-stack solid oxide fuel cell system life prediction method
A fuel cell system and solid oxide technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as difficult to achieve prediction results, lack of remaining life prediction of multi-cell stack systems, etc.
Active Publication Date: 2022-03-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0004] The current methods for predicting the remaining life of fuel cells include model-based methods, data-based methods, and hybrid methods, but the current method is mainly to predict the remaining life of a single stack, and lacks the prediction of the remaining life of a multi-stack system
For a multi-stack system, the degradation rate of each stack is different in the high-temperature operating environment, and they will also affect each other. If the correlation between the stacks is ignored, the remaining life of the existing single stack It is difficult to achieve the ideal prediction effect if the prediction method predicts the remaining life of the multi-cell stack system
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[0020] see figure 1 , the specific implementation steps of the multi-stack solid oxide fuel cell system life prediction method of the present invention include:
[0021] Step S1, establish the decay model of each stack in the multi-stack system, see figure 2 , the construction of the single-stack decay model is as follows;
[0022] S1.1. Establish the decay model of the stack according to the Wiener process:
[0023] ΔV (i) (t)=V (i) (0)-V (i) (t) = f(t; b (i) )α (i) +β (i) B(t)
[0024] V (i) (0)-Y (i) (t) = ΔV (i) (t)+γ (i)
[0025] Among them, t is the running time of the system, i=1,2,...,n, n is the number of stacks in the multi-stack system, ΔV (i) (t) is the real-time decay value of the i-th stack output voltage, V (i) (0) represents the standard voltage (that is, the initial voltage) of the stack i. V (i) (t) is the real value of the output voltage of stack i at time t, f(t; b (i) )α (i) is the drift coefficient of stack i, indicating the average de...
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The invention discloses a method for predicting the service life of a multi-stack solid oxide fuel cell system, belonging to the technical field of solid oxide fuel cells. According to the historical observation data of the output voltage of each stack in the multi-stack system, the present invention establishes a decay model of the output voltage of a single stack considering the measurement error based on the nonlinear Wiener process, and then calculates the residual voltage of each stack in the multi-stack system. The cumulative distribution function of life. Then, the correlation between the decay voltages of each stack in the system is described by the Copula function, so as to obtain the cumulative distribution function of the remaining life of the multi-stack system, and realize the prediction of the remaining life of the multi-stack system. The present invention is based on the nonlinear Wiener process, and can characterize the decay process of the electric stack operating under complex working conditions; at the same time, using the Copula function to characterize the correlation between the electric stacks in the multi-electric stack system is the same as ignoring the correlation between the electric stacks. than, which is more suitable for practical application.
Description
technical field [0001] The invention belongs to the technical field of solid oxide fuel cells, and in particular relates to a method for predicting the service life of a multi-stack solid oxide fuel cell system. Background technique [0002] Solid Oxide Fuel Cell (SOFC) is an electrochemical device that directly converts the chemical energy in fossil fuels into electrical energy under medium and high temperature conditions, in which there is no combustion process and mechanical movement, and the reaction product is only water. , so that it has the advantages of high efficiency, zero pollution, low noise and so on. As an important means to solve the energy crisis in the "post-petroleum era", SOFC is one of the most promising power generation technologies in the 21st century. In practical applications, for the fuel cell power supply system of large-scale power consumption equipment, the power provided by a single stack is limited, and multiple stacks are often connected in se...
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IPC IPC(8): G06F17/10G01R31/392G01R31/385G01R31/378G01R31/367
CPCG01R31/392G01R31/385G01R31/378G01R31/3648G01R31/367
Inventor 吴小娟黄洋王君皓
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA