Research On Satellite High Flywheel Torque Motor Bidirectional Inverter Power

In the process of satellite monitoring,the satellite needs to quickly adjust the attitude and monitor the hot spots timely.The rapid adjustment of satellite attitude requires the rapid transformation of the flywheel speed and the satellite power system needs to provide a large instantaneous power.But the space of small satellite and battery capacity are small,so the traditional small satellite power system is unable to meet the requirements of the high torque flywheel.Super capacitor has the characteristics of high power density and instantaneous high power,which makes up for the shortcomings of the battery.In this paper,the traditional satellite power system can satisfy the demand of load power change greatly after configured super capacitor.This paper analyzed the influence of great moment flywheel and super capacitor which were configured in traditional small satellite power system by simulation,and introduced the hardware design of the bidirectional DC/DC converter based on the super capacitor.First of all,this paper established the satellite power management simulation system by MATLAB software,and analyzed the influence of the traditional satellite power system on the operation of the system.Firstly,it built a traditional small satellite power system which was composed of simulated photovoltaic power generation,lithium battery cells and general AC load,and analyzed the DC bus voltage of the system which was figured bidirectional high power torque flywheel.And it determines whether the system can run stably or not.Then,I analyzed the improvement of power system after it was configured with super capacitor.Lastly,I used lithium battery and super capacitor simulation whose initial values were different.If the result is that super capacitor capacity is higher and lithium battery capacity is lower,it indicates that the system is more stable than the other initial state.Using this result determined the specific parameters of power allocation.When the bidirectionalDC/DC converter has fast PID adjusting speedconnected to super capacitor cells in the system,power supply system can run steady.The second part,the regulation rate of bidirectional DC/DC converter from the analysis of thesimulation result plays a crucial role in the stable operation of power system.So,physical design mainly focused on 3k W bi-directional DC/DC converter and super capacitorvoltage balancing circuit hardware.This paper introduced in detailproblems and solutions in the design process,and hardware design and software flow of key part and communication protocols of CAN serial port.The weight of thebidirectional DC/DC converter and super capacitor component was just about 3kg.Finally,the experimental equipment and content which is about power systems is described in this paper,and data of super capacitor under different discharge power is recorded.Then the discharge curve and terminal voltage curve of super capacitor are drew,and the result shows that the bidirectional DC/DC converter has the advantages of high accuracy,high efficiency,high instantaneous power and light weight.The converter is controlled by fast real-time PID regulation and communication,so that its output power makes the satellite power system stable and continuous.This design in this paper solves the issue of great instantaneous power variation,and the above research has certain practical significance in the engineering application.