An improved ampere-hour integration method based on extended state observer

Abstract

The invention discloses an improved ampere-hour integration method based on an extended state observer, which solves the disadvantages of large errors in the SOC estimated by the existing traditional ampere-hour integration method. The battery current is brought into the battery terminal current-SOC model to obtain the theoretical estimated value of SOC, and the theoretical estimated value of SOC and the battery current value are input into the extended state observer to obtain the theoretical value of system dynamics, which is compared with the actual estimated value of SOC estimated by the traditional ampere-hour integration method Values ​​are compared with the actual system dynamic estimated value obtained by the extended state observer and the system dynamic error signal is definitely integrated to obtain the final estimated value of the SOC based on the improved ampere-hour integral of the extended state observer. The improved ampere-hour integration method of the state observer can solve the problem of battery state-of-charge estimation error caused by the battery initial battery SOC estimation error and system uncertain dynamics in the existing traditional ampere-hour integration method.

Description

technical field [0001] The invention relates to a battery state-of-charge estimation method, in particular to an improved ampere-hour integration method based on an extended state observer. Background technique [0002] The ampere-hour integration method is a common battery state of charge (State of Charge, SOC) estimation method in engineering practice. Accurately calculate the amount of electricity charged or consumed, and analyze the remaining capacity of the battery based on the estimated SOC of the initial battery charge. The method is simple, but during online operation, the SOC estimated by the traditional ampere-hour integration method has a large error. shortcoming. There are three reasons. First, it is difficult to accurately obtain the initial battery SOC. Second, due to the influence of temperature, hysteresis, and thermal effects, there are still some uncertain dynamics in the system. Third, due to sensor errors, the current estimation is inaccurate. SUMMARY ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide an improved ampere-hour integration method based on the extended state observer, which can solve the battery state of charge caused by the battery initial power SOC estimation error and system uncertain dynamics in the existing traditional ampere-hour integration method Estimation error problem

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