Design And Implementation Of High Reliability Wind-solar-diesel Hybrid Energy Supply System For Base Station

With the rapid development of wireless communications,mobile phones have become a necessary facility in people’s lives and make daily communication between people easier and more efficient.A large number of communication base stations is required to construct the communication network.For base stations in remote areas that cannot normally obtain the mains supply,it is of great significance to design a high-reliability base station power supply system.Compared with the use of diesel generators as power supply for base stations,renewable power supply for communication base station is considered very promising for environmental benefits in remote mountains region and island where no power grid is available.This paper will discuss power supply for base station with renewable energy.On the other hand,energy storage unit reliability optimization measures are proposed.First of all,because the main load of the base station is-48 V DC and the voltage range is wide,an optimized design scheme for the base station power supply was proposed based on the traditional DC micro-grid architecture.The bi-directional convertor,which serves as energy exchange channel between energy storage and DC bus,is eliminated.The relevant output control strategies for Photovoltaic(PV)and Wind Turbine(WT)are described.A speed-regulating charging control scheme based on a diesel generator is designed,and achieve the charge control of the battery.A model of off-grid wind-solar-diesel hybrid generations with energy storage was built employing MATLAB/SIMULINK,the control strategy proposed in this paper is verified.The diesel generator governor charging control experiment based on the HGM7110 DC DC generator controller was carried out.Secondly,many factors that affect the reliable work of energy storage battery packs are analyzed,a battery management system(BMS)was designed for energy storage unit.Related reliability optimization designs include:First,by comparing the different battery pack connection topologies,this paper optimizes the battery connection topology considering the reliability of the power supply;Then,a comparative analysis of balanced schemes using different control strategies was conducted.Considering the deficiencies in the traditional capacitor equalization scheme,an equalization scheme based on LTC3305 battery was designed.The preliminary verification of the equilibrium scheme was carried out through relevant equilibrium experiments;Finally,an on-line battery lifetime detection and alarm system was proposed to realize the on-line estimation of State of Health(SOH).At the same time,the relevant parameter correction is performed on the basis of the traditional ampere-hour integration method,so that the on-line detection accuracy of the state of charge(SOC)of the battery is improved.This article also made a software and hardware design for the battery lifetime detection and alarm system,the SMS message alarm function based on SIM900 A GPRS module has been completed.