Application Of ADRC-based Bidirectional DC-DC Converter In Energy-Saving Elevator System

As the necessary and convenient equipment for modern buildings,the elevators generate about one-fifth of the total energy consumption of buildings in China,which has a huge energysaving space.At present,the energy consumption braking scheme adopted by most elevators will cause great energy waste,and the inverter energy feeding scheme adopted by a small number of energy-saving elevators will cause harmonic pollution problems to the power grid.In recent years,the DC energy storage scheme with two-way DC-DC converter combined with super capacitor has emerged.It effectively utilizes the power supply structure of the current elevator system,and combines the characteristics of super capacitors to realize not only the braking energy of the elevator,but also avoids the energy exchange with the power grid and does not cause harmonic pollution to the power grid.It is an elevator energy-saving technology with great development potential.In this paper,the background of supercapacitor which applicates in energy storage is first analyzed.Combing the power supply scheme of most elevator systems,the function index of bidirectional DC-DC converter based on compatibility is established.Then a bidirectional full bridge converter as bidirectional DC-DC is selected as the main circuit topology of the converter device.The practical improvement of the topology is completed for some problems existing in the actual elevator system.Secondly,the peak current mode double closed-loop control scheme is adopted to model the system and design the controller.Among them,the subharmonic oscillation problem of the model itself is solved by the slope compensation scheme;the equivalent power level model of the system is established by the state space averaging method;the strong nonlinearity and the large signal disturbance are applied to the bidirectional DC-DC converter.Features,the introduction of a strong robust Active Disturbance Rejection Control,combined with the system’s own characteristics to improve the controller structure.On this basis,the time domain and frequency domain simulation of Matlab/Simulink is built to verify the correctness of the control method.Finally,in order to verify the feasibility of the overall design of the device,the hardware circuit and software program design of the system is completed.Then a bidirectional DC-DC converter experimental platform is built,and the corresponding test plan is designed.The experimental results show that the expected functional indicators can be achieved,and the working conditions of the elevator system can be meted.The device has practicality and high reliability,and provides a basis for further improvement of the equipment.