| The distribution network automation terminal usually uses the battery as the backup power source to ensure that it can continue to supply power to the distribution network automation terminal and the switching mechanism after the line is tripped.However,after repeated high-current discharge,the terminal voltage of the battery will decrease,the internal resistance will increase,and its charge and discharge performance will be weakened,which will not be enough to continue to ensure the normal operation of the automatic switch.Therefore,it is generally necessary to replace the distribution network automation terminal power supply within 3 years.Supercapacitors have developed rapidly and are gaining popularity in the field of energy storage.They are currently used in automotive applications and natural energy harvesting.Compared with traditional batteries,supercapacitors lack financial support,which leads to a great degree of restriction to technical progress and development.At present,lead-acid batteries and lithium batteries are widely used,but their charge and discharge capacities are far less than supercapacitors.In the case of harsh outdoor environment and frequent power failure trips,battery life is shortened due to insufficient long-term charging,which affects the normal operation of the automatic switch.Therefore,it is very necessary to study the supercapacitor energy storage system.In this paper,the super capacitor is mixed with the ternary battery.The battery is responsible for maintaining the power supply of the terminal.The supercapacitor is responsible for the energy storage mechanism of the switch,replacing the single battery as power supply of the working power supply of the distribution network automation terminal and the distribution network electric operation mechanism,so as to achieve the purpose of improving battery life.The research status and development trend of super energy storage system at home and abroad are researched.The overall design scheme of energy storage system is completed.The modular hybrid energy storage scheme of super capacitor and battery is proposed.The energy storage principle and equivalent circuit model of supercapacitor and the outstanding advantages of ternary battery in the battery field are analyzed.Due to the complementary performance of the supercapacitor and the ternary battery,the modular hybrid energy storage system of both has good characteristics and the configuration is more flexible.At the same time,the boost control theory of energy storage system is studied and analyzed.The main circuit composed of hybrid energy storage module,DC/DC converter is designed.The main control circuit with DSP chip as the core is designed,and the PWM pulse signal is provided for the switching element drive circuit such as IGBT.In order to ensure that the hybrid energy storage module can supply power to the automation terminal equipment normally,the voltage,current,temperature and other acquisition circuits and protection circuit design are carried out,and the circuit schematic diagram and calculation formula are given.In combination with the control requirements of the system circuit,the overall structure of the software is designed.This paper completes designation of the system control program,data acquisition program and protection program,gives the program flow chart and explain in detail.Through the simulation test of the key circuit of the energy storage system-Boost converter,it is verified that the Boost circuit is suitable for the energy storage system.The application of the energy storage system is analyzed,and the capacity calculation formula of the super capacitor module and the ternary battery module is given.At the same time,the key parameters' data such as the battery capacity,the terminal voltage and the internal resistance of the ternary battery module are monitored,counted and analyzed.It is verified that the supercapacitor can achieve the design goal of extending the power life of the current distribution network automation terminal. |
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