| The Power Energy Internet(hereinafter referred to as Energy Internet),as a new energy network that can integrate multiple renewable energy sources and traditional power grids,has gained wide attention due to its characteristics of green,intelligence and sharing.Further,the hybrid energy storage system plays an important role for maintaining the energy Internet operating efficiently and stably.Therefore,it is of great significance to study the related issues of power converter structure,control strategy and system energy management strategy of hybrid energy storage system.This paper will take the home energy router as the application background,and consider the working characteristics of the relevant energy storage components,besides,design the hybrid power storage system interface power converter structure,and realize the closed-loop control.On this basis,the energy management strategy of the home energy router and the power allocation strategy of the hybrid energy storage system are also designed.Firstly,the research on the power converter related problems of hybrid energy storage system is carried out.Based on the background of household capacity and energy demand,the overall model of home energy router is constructed,and a three-port power converter based on staggered parallel dual active bridge circuit is designed.Combined with its working principle,the circuit equivalent model of the equivalent splitting of the multiplexing switch is established to simplify the system analysis and design.In order to improve the system efficiency,a new phase shift angle plus duty cycle control strategy is proposed,and the converter power transfer relationship is quantitatively analyzed.Next,a small-signal model of the interleaved parallel dual-active bridge circuit is established,and the design of the closed-loop controller of the converter is completed in this paper.A hierarchical small-signal modeling method based on the equivalent model of staggered parallel double-active bridge circuit is proposed.The small-signal mathematical model under given circuit parameters is also established.This method is beneficial to the reduction of circuit modeling complexity so that the proposed control strategy can be implemented easily.The steady-state and dynamic performance of the circuit are analyzed by the frequency method,and the small-signal model is corrected to complete the design of the closed-loop controller of the converter.Then,the energy management strategies of home energy routers and hybrid energy storage systems are studied in this paper.The energy management strategy of energy router is proposed to ensure that the home energy router can work stably and efficiently under different conditions.At the same time,combined with the working characteristics and constraints of the battery and super-capacitor,the energy management strategy of the hybrid energy storage system is proposed to ensure the energy storage device making full use of their advantages and operating efficiently and stably.The theoretical analysis of this paper was verified by MATLAB/Simulink simulation software and the 500 W hybrid energy storage system hardware experimental platform which was built in this paper. |
PDF Full Text Request