Research On DC Power Supply System Of Data Center

With the arrival of the big data era,the demand for Internet products and services is increasing.Therefore,as the pivot of data bearer and media information transmission,the energy consumption and stability of the data center become the research hotspot.In this context,considering saving energy,reducing data center room construction costs and environmental protection,renewab le energy has been introduced into the power supply system,formatting green data center power supply system.DC power supply system of data center with photovoltaic power generation,energy storage device,AC power grid and load was designed.For security and stability of the system operation,this article mainly focused on the system operation control and energy management.Firstly,the structure of power supply system in data center was introduced,including the structure of conventional data center UPS power supply system,AC bus power supply system in traditional data center and its DC bus power supply system structure.The advantages and disadvantages of each system was also analyzed.This paper introduced the topology structure and the system componen ts of the green DC power supply system.Mathematic model and characteristics of PV cells were especially analyzed.The emulation model of PV system and energy storage unit was also given,providing the simulation platform of system operation control for the next chapter.Secondly,DC bus and grid interface unit,PV interface unit and energy storage system operation control mode of the green data center DC power supply system were introduced as well as the circuit structure of each interface unit.The contro l principle of MPPT,constant voltage and current control mode of DC bus and grid interface unit,control management,control implementation,application status and function of control were analyzed emphatically.It should be pointed out that the control principles and strategies of constant voltage and current for the energy storage system were also included in this article.Various control strategy structure chart could be found in the same chapter.The correctness and effectiveness of the control strategies of each system were verified by the simulation results.Finally,the main research content of the DC power supply system was its equivalent model and relations of bus bar voltage and power summarized by the energy analysis,meanwhile,the system was divided into different modes according to the bus voltage stability control.The simulation model was built on Matlab / Simulink software system,and the operation of the system in grid-connected and island-isolated mode was analyzed.Appropriate energy management strategy was adopted to realize reasonable flow of power supply unit and load,so as to achieve high efficiency and stable operation of DC power supply system.