Research On Electro-mechanical Transmission Electric Power Balance And Coordianted Control Strategy

With the development of electro-mechanical transmission technology,it has become the hotspot of the world due to its unparalleled advantages.In recent years,more and more electrical equipments are equipped on the tracked vehicles,such as electromagnetic gun,active suspension etc.So electro-mechanical transmission technology is widely used in the tracked vehicles.Therefore,as an important part of the electro-mechanical transmission,electrical system plays an important role in the stability of the vehicle.Good electrical performance is a guarantee of vehicle performance.This paper will research on the electric power balance of the EMT’s high-voltage electrical system and power supply control strategy.In this paper,the dual-mode EMT system is studied as the research object.The influence factors of high-voltage electrical system’s electric power balance and the state of electric power balance uner different working conditions are analyzed.A high-voltage electrical system simulation platform is established.Based on the electric power balance and power supply characteristics,a double closed-loop electric power coordinated control strategy is proposed.At last,the results are verified by multiple working conditions and test bench.According to the basic rule and essential parameters of the EMT system,considering the control method of each component,the key component model is established by means of combining the experimental data and mathematical model.Especially for DC/DC converter and permanent magnet synchronous motor,its model is refined to reflect the dynamic characteristics.Based on the Matlab/Simulink simulation platform,the simulation platform of 40 t level vehicle is established.Multiple working conditions simulations show that the simulation platform can reflect the working status of every component and dynamic changes of each parameter accurately.The influence factors of electric power balance of electro-mechanical transmission are studied.It is analyzed from three aspects: efficiency,dynamic response characteristics of the engine and dynamic response characteristics of the motor.Different working conditions are simulated.And the electric power balance of high-voltage electrical system is analyzed.On the basis of analysis results,a double closed-loop electric power coordinated control strategy is proposed.This strategy can ensure the precision of power distribution,the rapidity of electric power supply and the stability of DC bus voltage.The fuzzy PI control algorithm is adopted to design the controller of the strategy in order to improve the adaptability of the system and ensure its control precision.To verify the feasibility of the double closed-loop electric power coordinated control strategy,the EMT low-power function prototype bench test based on the 40 t level EMT vehicle is built.Based on the basic parameters and dynamic characteristics of each part in the test bench,its Simulink model is established and the test conditions are simulated.In the end,experimental verification is accomplished.Comparing the experimental results and the simulation results,it shows that the double closed-loop electric power coordinated control strategy can ensure the precision of mechanical and electrical power distribution and the responding speed of electrical power supply.