Research On Non-energy Consumption Equalization Of Supercapacitor Banks

As the construction of ecological civilization continues to be refined in the new era,supercapacitors have broad prospects for development.In order to meet the voltage requirements of the load,multiple supercapacitors are connected in series,but the characteristic mismatch of the supercapacitors in series presents various challenges.In the voltage mismatched energy storage module composed of series supercapacitors,some monomers with higher or lower voltages may overcharge or discharge during the cycle process,which will aggravate the voltage imbalance between the monomers.In order to take full advantage of the life and storage performance of series supercapacitor banks,the monomer voltage of series supercapacitor banks needs to be balanced.Voltage equalization technology is a key part of its application.Based on the comprehensive analysis of the existing series supercapacitor group voltage sharing technology,two non-energy consumption voltage sharing circuits are proposed in this paper.The main work of this paper is as follows:Firstly,a series and parallel switching voltage equalizing circuit for supercapacitor banks is proposed.The circuit requires no voltage detection and feedback control components,and the components in the circuit only need supercapacitor and switch.The voltage equalizing principle and process of the series-parallel switching equalizing circuit are expounded successively,and the PSIM simulation of this voltage equalizing circuit is carried out,and the results show that this non-energy consumption equalizing circuit realizes the function of voltage equalizing.Secondly,a series voltage equalizing circuit based on the combined Sepic circuit is proposed for the supercapacitor bank,which also requires no voltage detection and feedback control components.The circuit only needs a switch,and the duty cycle is constant.The working principle of the non-energy consumption equalizing circuit is analyzed,and the voltage equalizing principle and process of the equalizing circuit based on the combined Sepic circuit are expounded.The voltage equalizing circuit is simulated by PSIM,and the results show that this voltage equalizing circuit can realize the function of the voltage equalizing of each unit.Thirdly,to put forward the series of the supercapacitor group series-parallel switching voltage balancing circuit and based on the modular Sepic group series super capacitor voltage balancing circuit,respectively,set up the system experiment platform,for groups of tandem supercapacitor voltage balance experiment,the experimental results show that the monomer voltage converged in tandem supercapacitor banks,achieved the purpose of the voltage balance,The validity of the proposed non-energy consumption voltage equalization circuit is verified.Fourthly,aiming at the problem of rapid voltage drop during the use of series supercapacitor banks,a new type of booster converter is applied to series supercapacitor banks to improve the overall voltage level of series supercapacitor banks and meet the needs of high voltage occasions.The working principle of the new booster converter is analyzed and the PSIM circuit simulation is carried out to verify the feasibility of the booster circuit.