Research On Elevator Energy Saving Technology Based On Hybrid Energy Storage System

In recent years,China’s elevator industry has developed rapidly,and elevator energy-saving potential is huge,China’s demand for energy-saving elevators is also increasing gradually,so the research of elevator energy-saving technology has a particularly important economic and social significance.Considering that the power feedback technology will produce high-order harmonics and the energy density of super capacitors is low,this thesis studies the elevator energy-saving technology based on hybrid energy storage system.This thesis designed the overall structure of the elevator energy-saving system based on hybrid energy storage device.According to the working characteristics of the elevator,the Buck/Boost converter is selected to compare the advantages and disadvantages of the bidirectional DC/DC converter topology.The working principle and charging and discharging characteristics of the super capacitor and lead-acid battery are studied and analyzed,and the appropriate hybrid energy storage structure is selected.The capacity of hybrid energy storage device is optimized,the energy consumption of elevator during operation is modeled and analyzed,and the cycle life of battery is calculated by rain flow counting method,then the minimum daily average cost is used as the objective function to optimize the capacity allocation.After optimization,the average daily cost was reduced by 52.53%.The parameters of the hybrid energy storage device are selected and modeled.The hybrid energy storage control strategy is designed with bus voltage,supercapacitor voltage and lead-acid battery voltage.The supercapacitor is used first.When the supercapacitor voltage exceeds a certain threshold,the lead-acid battery is put into use.Finally,the elevator traction system and the simulation of the hybrid energy storage device are established.The elevator energy-saving system based on hybrid energy storage device is verified by experiments.Build an elevator energy-saving system based on hybrid energy storage device,observe the DC bus voltage and the charging and discharging current of energy storage components;calculate the energy-saving effect according to the voltage and current of the city side,the experiment shows that the elevator using hybrid energy storage device can save 22.8% energy consumption,the elevator using only supercapacitor can save 19.8% energy consumption.