Optimal Operation For Data Center Considering Backup And Energy Storage Function Of Uninterrupted Power Supply

With the rapid development of Internet technology,data centers are becoming an indispensable and important infrastructure in the information society.Equipment such as data center servers,storage,and chillers need to be continuously operated around the clock to complete a large number of computing tasks,resulting in huge data center power costs.Currently,operators represented by Google Data Center have introduced renewable energy to generate power for data centers,but the joint supply of renewable energy and power grids requires frequent AC-DC conversion,resulting in huge secondary energy consumption in the data center,and The data center uninterruptible power supply(UPS)is only used as a backup power supply in the event of an energy supply failure,which causes a large amount of unused UPS storage batteries to be idle when the data center is normally powered.Therefore,the data center UPS must also consider its energy storage function as a backup.UPS energy storage system through energy information and Internet control technology,the use of data center UPS energy storage capabilities,combined with renewable energy for the data center for energy,to meet the energy needs of the data center under different operating conditions,enhance renewable energy and energy storage Resource utilization reduces data center operating costs.Therefore,it is of great significance to study the characteristics of UPS backup and storage charge and discharge and its power output and UPS energy storage system participating in data center power supply.The dissertation firstly studies the specific structure of UPS energy storage system,elaborates the UPS charging and discharging characteristics,analyzes the UPS backup and energy storage charging and discharging control strategy under time-of-use price,and considers the temperature and performance degradation of the energy storage battery.Factors such as the impact on the charge and discharge output,the charge and discharge power model of the UPS energy storage system was proposed.The model portrayed the charge and discharge power output of the UPS from the cell layer to the energy storage system layer,and realized the charge and discharge quantitative description of the UPS energy storage system.Secondly,in the charge and discharge process of data center UPS energy storage battery,due to the uncertainty of SOC prediction may lead to excessive charge and discharge of energy storage battery,analyze the backup power supply and demand response strategy of data center power load,consider the data center UPS standby response.Capacity,as a power output model for backup,considering the constraints of UPS storage and charge and discharge constraints,proposes a charging and discharging scheduling framework for UPS energy storage systems,and aims to minimize the cost of electricity in the data center,and further proposes the use of electricity.The UPS backup and storage charge and discharge scheduling models for load forecasting are designed to maximize the use of energy storage resources and the effectiveness of the proposed model is verified through simulation.Finally,considering the excessive energy consumption of the data center and the low utilization rate of renewable energy,considering the characteristics of UPS backup and storage charge and discharge,a UPS standby charge and discharge characteristic model was proposed,taking into account the load characteristics of data center servers and other equipment,and UPS storage.The battery-constrained and grid tie-line power constraints are among the constraints.With the goal of minimizing the day-to-day electricity purchase cost of the data center,the data-center electricity-cooling joint supply optimization model considering UPS backup and energy storage functions is further proposed.The model adopts the branch definition method.The simulation example uses the first phase of the Petro China data center as a reference case,and simulates the workload data in Google's official database as a sample to determine the UPS charging and discharging power,photovoltaic power output,and data center server electrical load and cooling.Loads,the results show that UPS energy storage solves the photovoltaic power generation uncertainty and the data center's own high energy consumption issues,improve the utilization of renewable energy in the data center,greatly reducing the data center power costs,and improve the data center operation economical.