Supercapacitor charge state estimating method based on Kalman filtering algorithm

A technology of supercapacitor and Kalman filter, which is applied in the direction of instruments, measuring electricity, and measuring electrical variables, etc. It can solve the problems of no automatic error correction mechanism and the estimation of the state of charge of supercapacitors cannot meet the accuracy requirements, so as to improve energy utilization efficiency And the effect of working life, improving safety and reliability

Inactive Publication Date: 2015-06-24
DALIAN UNIV OF TECH
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Problems solved by technology

It can be seen from the above formula that the ampere-hour measurement method will produce error accumulation during use. Due to its relatively simple calculation process, it does not have an automatic error correction mechanism, so using this method to estimate the state of charge of a supercapacitor cannot meet relatively high precision requirements

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  • Supercapacitor charge state estimating method based on Kalman filtering algorithm
  • Supercapacitor charge state estimating method based on Kalman filtering algorithm
  • Supercapacitor charge state estimating method based on Kalman filtering algorithm

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0025] Supercapacitor state of charge estimation method in the present invention comprises the following steps:

[0026] 1) Collect real-time voltage and current values ​​of supercapacitors in working state.

[0027] 2) Based on the experimental data in step 1), the online parameter identification of the supercapacitor model is carried out by using the least square method.

[0028] As shown in the figure, the equivalent circuit model of the supercapacitor under normal working conditions is established, and the model parameters are identified online. Based on the identification model...

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Abstract

The invention relates to a supercapacitor charge state estimating method based on the Kalman filtering algorithm, in particular to a charge state estimating method. The charge state estimating method includes the steps of firstly collecting the voltage value and the current value of a supercapacitor in the working state in real time; based on the collected data, carrying out online parameter identification on a supercapacitor model with the least square method; based on the collected data and an obtained circuit model, estimating the charge state of the supercapacitor with the Kalman filtering algorithm. By means of the charge state estimating method, the supercapacitor charge state real-time estimation accuracy can be effectively improved; meanwhile, no large calculation load of a system is caused, and the charge state estimating method has the advantages of being high in stability and reliability and the like. Meanwhile, state variables of the nonlinear system can be accurately estimated through the Kalman algorithm, estimation does not depend on accurate initial value setting, and a system true value can be rapidly approached in the large-deviation original state.

Description

technical field [0001] The invention relates to a method for estimating the state of charge, in particular to a method for estimating the state of charge of a supercapacitor based on a Kalman filter algorithm. Background technique [0002] Supercapacitor is a new type of energy storage device based on the interface electric double layer theory. Compared with traditional energy storage devices, such as batteries, it has the advantages of short charging time, long service life, good temperature characteristics, energy saving and environmental protection. In recent years, due to issues such as environmental protection and energy crisis, supercapacitors have been widely used in many fields, such as new energy power generation, electric vehicles, and urban rail transit braking energy recovery and so on. [0003] In specific engineering applications, in order to ensure the safety and reliability of the supercapacitor energy storage system, its specific internal state-of-charge (St...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 张莉季炳成张健豪张昊然时洪雷
Owner DALIAN UNIV OF TECH
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