Non-storage online iterative estimation method of polarization curve and fuel cell system

Abstract

The invention provides a non-storage type online iterative estimation method of a polarization curve and a fuel cell system. The method comprises the following steps: establishing a polarization curve model of a fuel cell; acquiring current current information and current voltage information of the fuel cell in real time; identifying key characteristic parameters of the polarization curve model through a parameter identification system based on the current current information and the current voltage information, forming a new polarization curve model based on the key characteristic parameters, deleting the historical current information and the historical voltage information, and updating the new polarization curve model into a controller of the fuel cell, the method is based on the iterative least square method, the requirement for a controller of the fuel cell is small, the polarization curve model can be updated more accurately in real time, so that the state change of the fuel cell can be monitored conveniently, the operation parameters of the fuel cell can be adjusted conveniently, the operation process is simple, and the operation cost is low.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a non-storage online iterative estimation method of polarization curves and a fuel cell system. Background technique [0002] Polarization: The battery is polarized during the charging and discharging process. Generally, the battery polarization can be divided into three types: ohmic polarization, activation polarization (or electrochemical polarization) and concentration polarization. The respective response speeds of several types of polarization are also different. There are many factors that affect the degree of polarization, but in general, the greater the charge and discharge current density, the greater the polarization. [0003] The following categories are explained: [0004] (1) Ohmic polarization: As the name suggests, there is polarization caused by the ohmic internal resistance of the battery, called ohmic polarization, and also called resistance polarization. ...

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Problems solved by technology

[0010] The existing Chinese patent (application number: CN200810085612.X) discloses an algorithm for online self-adaptive polarization curve estimation of fuel cell stacks. The disadvantages of this algorithm are: the historical current and voltage data need to be saved after use, occupying the system memory

[0011] The existing Chinese patent (application number: CN202010141928.7) discloses a data-driven online performance evaluation method for fuel cells. Although this method can update the polarization curve parameter values ​​in real time during the entire fuel cell operation process, the performance of all single cells Estimate and provide more detailed information for control strategy optimization, but this method uses recursive formulas and is still relatively cumbersome

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