During the parallel charging and discharging process of lead-acid battery packs,there is a problem of uneven charging and discharging caused by individual performance differences,which in turn affects the overall performance and lifespan of the battery pack.In this regard,research is conducted on a parallel charging and discharging control method for lead-acid battery packs based on double hysteresis loops.Firstly,by analyzing the parallel charging and discharging working status of lead-acid battery packs,an equivalent working model of lead-acid battery packs is estab-lished.Then,the identified disturbance factors will be used as input variables for the transfer function,thereby deter-mining the transfer function of the disturbance variables.Finally,based on the principle of double hysteresis technolo-gy,the disturbance variables are decomposed for error compensation,achieving balanced control of parallel charging and discharging of lead-acid battery groups.The experimental results show that using the lead-acid battery pack returned from a DC system as the test object,after the application of the designed method,the rated voltage control of a single battery pack during parallel charging and discharging can be achieved,effectively ensuring its stable operation.
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