基于ADVISOR運(yùn)行模型的鋰電池SOC算法研究
[Abstract]:Since entering the 20th century, people pay more and more attention to the problems of energy consumption and environmental pollution control. In this form, the major automobile manufacturers all over the world attach great importance to the development of new energy vehicles, especially pure electric vehicles. The main energy of the electric vehicle is provided by the power battery, so the reasonable use of the remaining power of the power battery is related to the performance of the whole vehicle. Therefore, it is one of the key and difficult points in the field of electric vehicle to accurately estimate the charged state of battery (State of Charge,SOC. At the beginning of the thesis, the development of lithium battery and some basic theories are introduced, and the current developed SOC estimation method of battery is introduced, and the central differential Kalman filter (CDKF,Central Difference Kalman Filter) is used to estimate SOC. of battery. This paper studies the characteristics of lithium battery, summarizes the structure, advantages and disadvantages of equivalent circuit model using Kalman filter, and establishes and improves the equivalent circuit model of Thevenin. Then the open circuit voltage characteristic experiment and the characteristic voltage pulse experiment are carried out to provide the data support for the Matlab battery model. At the same time, the accuracy of each simulation data is determined by the method of data fitting. Then it introduces the estimation process of extended Kalman filter (EKF,Extended Kalman Filter), analyzes the principle and realization process of the central differential Kalman filter algorithm, and optimizes the error effect of CDKF in algorithm and practice. The system states, observation equations and derived matrices of the extended Kalman filtering algorithm and the central differential Kalman filter algorithm are obtained. Combined with the battery simulation model obtained from the previous experiments, the extended Kalman filter and the central differential Kalman filter are constructed by Matlab/Simulink to estimate the SOC. of the battery. In the final stage of the thesis, the simulation software ADVISOR2002 is used to establish the vehicle model of pure electric vehicle, and to obtain the current information of lithium battery under different operating conditions. The effectiveness of central differential Kalman filter and extended Kalman filter based on Matlab/Simulink for charge state estimation of power lithium battery is verified. From the experimental results, we can see the advantages of CDKF in the estimation of actual cell charge state.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:U469.72;TN713
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