Coordinated Control Research And System Design Of Flexible DC Power Supply System In Data Center

With the development of science and technology,in the context of new infrastructure,5G,Io T technology breakthroughs and the acceleration of digital transformation,data centers have become the focus of the development of various industries.An efficient,green,and highly reliable power supply system is the core of a data center and has become an important indicator for evaluating the overall level of a data center.Compared with the traditional power supply system,the flexible DC power supply system has the technical advantages of high efficiency and reliability,and is suitable for the access of the distributed new energy grid.The system coordination control strategy is an important means to realize the efficient and reliable operation of the flexible DC power supply system.In this paper,the flexible DC system is used as the power supply scheme of the data center,the coordinated control of the power supply system of the data center is studied,and the influence of the master-slave control and droop control strategies on the power supply system of the data center is analyzed.Considering the influence of the system DC voltage,an adaptive coordination control strategy is proposed to improve the DC voltage quality and power supply reliability of the data center power supply system.The main contents of this study are as follows:First of all,based on data center engineering and power supply related standards,clarify the power supply technical requirements of data centers,mainly considering three aspects: power supply reliability requirements,power supply power quality and new energy access,and by analyzing the advantages and characteristics of existing technologies,determine The flexible DC power supply topology of the data center;through the analysis and calculation of the system capacity,the system voltage level,converter station topology and electrical main wiring are determined,and then the main control unit of the system is mathematically analyzed to establish a voltage source converter,energy storage conversion The equivalent model of the photovoltaic converter is used to determine the parameters of the system power supply equipment.Secondly,the principle and characteristics of the master-slave control strategy and the droop control strategy of the power supply system of the data center are expounded.A simulation system is established based on the PSCAD/EMTDC platform to analyze the influence of the two control strategies under normal and fault conditions on the power supply system of the data center.Under normal conditions,the master-slave control has a long dynamic response time and good stability,which is a non-difference control;the droop control has a good dynamic response and poor stability,and is a differential control.In fault conditions,master-slave control relies on communication,and there is a possibility of mode conversion failure,and the system reliability is relatively insufficient;droop control does not rely on communication,and can achieve seamless mode conversion,with relatively high reliability.Although the reliability of the droop control of the data center power supply system is relatively high,the droop control is a differential control,and the quality of the DC voltage is low.Therefore,the droop control slope needs to be improved on the basis of the droop control strategy.Finally,according to the shortcomings of master-slave control and droop control,an adaptive coordination control strategy based on voltage margin is proposed,which improves the reliability and quality of power supply system of data center.Firstly,the voltage margin interval is divided,the adaptive interval range is clarified,and then the adaptive control principle is explained and analyzed,and the effectiveness of the adaptive coordinated control is verified by the PSCAD/EMTDC simulation platform.The research content of this paper is based on the project,and studies the coordinated control problem for the power supply system of the data center.By analyzing and comparing the master-slave control and the droop control,the high reliability of the droop control is more suitable for the coordinated control strategy of the data center power supply system,but the droop control is a Poor control.On this basis,according to the voltage margin of the control unit,an adaptive and coordinated control method is proposed,which provides technical support for the coordinated control of the data center flexible DC power supply system,improves the voltage quality and reliability of the data center power supply,and promotes the data center.Engineering application and development of power supply system.