Application Research Of Supercapacitor In Substation DC System

With the continuous development of smart grid,the traditional battery power supply method has gradually exposed some deficiencies in the application of substation DC power supply system.In recent decades,supercapacitors have been widely concerned by many scholars because of their advantages of fast dynamic response,high efficiency,large power density,long cycle life,clean and pollution-free.In view of the shortcomings of the DC power supply system of the substation and the many advantages of the supercapacitor,this paper proposes a DC power supply system based on supercapacitor energy storage,and takes the supercapacitor as the research object,focusing on its working principle,equivalent modeling method,voltage balance Technology and simulation modeling and optimized control of supercapacitor energy storage system.The working principle of supercapacitors is introduced,and several common equivalent mathematical models of supercapacitors and their charging and discharging characteristics during working are simulated and analyzed;the main factors that affect the rate of rise of the voltage of the supercapacitors are studied.The important modules such as the working mode,parameter selection,energy transfer efficiency and other important modules of the DC-DC converter method are analyzed in detail,and a voltage balancing method based on a dual-winding transformer is proposed on its basic circuit.This topology allows the use of multiple A classic twowinding transformer for multiplexer and selector circuits.This circuit can be applied to any number of series capacitors.The performance of the proposed voltage equalization circuit based on dual-winding transformers is analyzed and explored through simulation.Comparing the simulation results under all two sets of inductance parameters,it can be seen that the lower coil inductance exhibits better performance in terms of battery voltage change rate,and when implementing a switch design with lower internal resistance,the proposed conversion can be further improved Balance of the device.Based on the analysis of the mathematical model and control strategy of the bidirectional DC/DC converter,the mathematical model of the supercapacitor energy storage system is established.Design an optimal PID control strategy based on the multiverse algorithm,optimize the PID parameters through the multiverse algorithm,compare the unit step response of the traditional PID control with the multiverse optimization PID strategy,and prove that the multiverse optimization control strategy has more Response speed and robustness.Finally,the simulation experiment of the supercapacitor energy storage system is carried out.The simulation analysis shows that,compared with the traditional PID control strategy,the supercapacitor energy storage system has a faster response speed and higher steady-state accuracy under the control strategy of the multiverse optimization algorithm.The paper has 63 pictures,10 tables,and 80 references.