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Minimum target equation numerical solution method suitable for energy management of fuel cell system

A fuel cell system and target equation technology, applied in the field of numerical solution algorithms, can solve problems such as not always converging, and achieve the effect of minimum equivalent hydrogen consumption

Pending Publication Date: 2022-04-15
西安精密机械研究所
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Problems solved by technology

[0006] The purpose of the present invention is to solve the energy management problem of the UUV fuel cell hybrid power system, the existing method for solving the objective equation has the technical problem that it cannot always converge, and to provide a numerical solution of the minimum value objective equation suitable for the energy management of the fuel cell system method
[0008] In solving the problem of optimal performance of the UUV fuel cell hybrid power system by using the minimum value principle, the present invention incorporates the dichotomy method into the original method by using the monotonous change characteristics of the adjustment parameters, and improves the numerical iterative process of the differential equation

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  • Minimum target equation numerical solution method suitable for energy management of fuel cell system
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  • Minimum target equation numerical solution method suitable for energy management of fuel cell system

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing and specific embodiment content of the present invention is described in further detail:

[0031] Such as figure 1 As shown, the present invention is applicable to the numerical solution method of the minimum value objective equation for fuel cell system energy management, and the specific steps for completing the iterative solution are:

[0032] a. Define the Lagrange multiplier initial value λ(0), the multiplier variation Δ, the maximum allowable error ε of the SOC final value, let i=1, take λ i = lambda(0);

[0033] b. i Bring it into the Hamilton objective equation established according to the principle of minimum value, and start to solve the equation;

[0034] c. At each sampling time t in the task j At the position, calculate the control variable that minimizes the value of the Hanmilton equation - the target output power of the fuel cell, and combine the load power to further obtain the corresponding change of t...

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Abstract

The invention provides a minimum target equation numerical solution method suitable for energy management of a fuel cell system, and solves the technical problem that an existing target equation solution method cannot always converge under the energy management problem of a UUV (Unmanned Underwater Vehicle) fuel cell hybrid power system. According to the solving method, on the basis of a traditional secant method, a dichotomy method is fused in combination with the characteristic that the lithium battery SOC in the fuel battery hybrid system is monotonous about a target equation Lagrange multiplier, the dichotomy method can be used for solving an optimization equation under the boundary value problem, the possible zero division error is effectively avoided, the error can be converged to be close to the optimal solution from any initial value, and the optimal solution can be obtained. The problem that the solving process cannot be converged due to improper initial value selection is solved, and a stable and feasible solving method is provided for solving the energy management problem through the minimum value principle and achieving system optimal control.

Description

technical field [0001] The invention belongs to a numerical solution algorithm for boundary problems, and in particular relates to a numerical solution method for a minimum value objective equation suitable for energy management of a fuel cell system, and is suitable for the energy management strategy design of a fuel cell hybrid power supply system on a UUV. Background technique [0002] The hybrid system composed of lithium battery and fuel cell has both technical advantages, and is one of the development directions of underwater equipment power technology in the future. The optimization objective equation designed based on the minimum value principle as an energy management strategy can improve the overall performance of the system, so the method of solving the optimization objective equation will be the key to the overall performance of the system. [0003] The working environment of UUV is special, and the minimum hydrogen consumption should be taken as the energy manag...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/13
Inventor 高慧中路骏孙盼刘景云
Owner 西安精密机械研究所
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