Research And Design Of Scalable Modular Micro-Nano Satellite Power Supply System

As a new small spacecraft,micro-nano satellite has been widely used in the field of low orbit space exploration and earth observation.The power supply system is responsible for the power supply task of all devices on the satellite,which is the key for the satellite to complete the task.In order to meet the development requirements of modularization,integration,intelligence and expandability of micro-nano satellite,it is of great significance to research and design high-performance scalable modular micronano satellite power supply system.Photovoltaic boost converter is the basic topology of realizing MPPT for micro-nano satellite.At present,there is no systematic theoretical analysis on the working characteristics of photovoltaic boost converter,the combination of scalable distributed MPPT technology and photovoltaic boost converter,and the energy distribution of power supply system.Therefore,this paper analyzes and studies the above problems in turn,and on this basis,the principle prototype of the scalable modular micro-nano satellite power supply system is designed and made.Firstly,the large signal and small signal models of photovoltaic boost converter are established,then a disturbance-observed MPPT algorithm based on duty cycle is introduced.The steady-state performance and stability of photovoltaic boost converter are described,and the efficiency of the converter is studied.Then,the working characteristics of the parallel,series and series-parallel distributed MPPT photovoltaic system composed of photovoltaic boost conversion unit are studied,and the effect of light intensity inconsistency on the performance of the photovoltaic system is discussed.On this basis,the energy distribution relationship among photovoltaic system,lithium battery pack and load voltage conversion module is studied.Finally,the principle prototype of the power supply system is made according to the technical specifications of a kind of scalable modular micro-nano satellite power supply system.The frame structure and parameter design of the system are introduced in detail,and the correctness of the theoretical analysis is further verified by experiments.