Research On Energy Saving Technology Of Elevator Drive System Based On Super Capacitor

With the rapid growth of the national economy and the demand for energy,the problem of energy shortage is becoming more and more serious,and the research and development of energy-saving and emission reduction technologies have attracted much attention.As an indispensable tool for urbanization development,elevators have huge energy consumption.Conventional elevators often use energy-consuming resistors to consume braking regenerative energy,and the system energy utilization rate is low.Based on this background,this thesis designs an energy storage device based on super capacitors,and conducts in-depth research on the control strategy of the bidirectional DC/DC converter at the core of the energy storage system.The energy storage system can not only regenerate braking energy but also release electrical energy to provide elevators.Energy consumption peak power,in order to achieve the purpose of energy saving and consumption reduction.In order to facilitate the formulation of energy distribution strategies for energy storage systems,this thesis first analyzes the system structure,operating principles and characteristics of traction elevators,and calculates the electric energy consumption during elevator operation based on the power flow and electromagnetic torque curves under the typical operating conditions of elevators With regenerative power feed.The overall structure of the elevator energy-saving system is designed according to the operating characteristics of the elevator,and the topology of the bidirectional DC / DC converter is selected and analyzed.On this basis,the storage capacity of the super capacitor group is further allocated and the parameters are matched.Because the elevator energy-saving system has the characteristics of strong nonlinearity and large input and output disturbances,in order to improve the energy utilization of the energy storage energy-saving system,improve the system control accuracy,dynamic response and static performance,this thesis designs a bidirectional DC/DC converter based on differential geometry theory.Linear composite controller,based on the analysis of the two working modes,establishes an affine nonlinear system model using state space averaging method and verifies the accurate feedback linearization conditions and requirements of the model,and uses nonlinear feedback coordinate transformation and differential homeomorphic transformation to nonlinear The system is linearized,and then combined with synovial membrane variable structure control theory to design the system control strategy.Finally,build an elevator energy-saving system simulation platform and configure system parameters and communication structure to verify the energy-saving system operatingcharacteristics and energy storage system control algorithm.The simulation results show that the elevator energy-saving system has a good control effect and high energy utilization rate.The thesis has 54 pictures,5 tables and 72 references.