| The underground coal mine will form a single-headed tunnel during mining and excavation,which requires the use of local ventilators to exhaust gas and other harmful gases to ensure production safety,so the reliability of power supply for underground local ventilators in coal mines is extremely demanding.This paper uses the configuration of emergency energy storage power supply to improve the reliability of power supply to underground local ventilation fans,focusing on the battery management system of emergency energy storage power supply device.This chapter designs the overall function of the emergency energy storage power supply device according to the "three special-purpose devices and two lockups" power supply method for underground local ventilation fans in coal mines.Based on the comparison and analysis of various grid connection methods,the emergency energy storage power device was chosen to be connected to the local ventilation fan in parallel,according to which the power conversion system and battery management system functions of the emergency energy storage power device were designed.Based on the analysis of the single battery performance inconsistency of the emergency energy storage power device,the open-circuit voltage is selected as the equalization management target,and the grouped hierarchical active equalization control strategy is adopted based on the traditional Buck-Boost chopper circuit,and the simulation results show that the grouped hierarchical Buck-Boost chopper circuit proposed in this chapter has a fast equalization speed and good equalization effect.Based on the method of building a simulation model to optimize the discharge management method,a second-order RC equivalent circuit model is built based on the analysis of the current commonly used equivalent model,and the relationship between the battery pack and the single cell model is derived by the formula.The model parameters are identified using the hybrid pulse power characterization test,and an equivalent model with certain accuracy is initially obtained.The equivalent model was input to the Urban Dynamometer Driving Schedule conditions to verify the model applicability and accuracy.The extended Kalman filter method is selected to estimate the available state of the remaining charge of the battery model,and the variable forgetting factor recursive least square is selected to identify the model parameters to verify the accuracy of the optimized equivalent second-order RC model.The simulation results show that the equivalent circuit model optimized by the two algorithms can well simulate the electrical characteristics of the solid battery,which is of application value to effectively control the battery management system of the emergency energy storage power device of underground local ventilation fan and improve the safety and reliability of uninterrupted ventilation of underground local ventilation fan.There are 69 figures,3 tables and 85 references in this thesis. |
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