Research And Design Of Household Electric Energy Router System

With the development of China’s social economy and industrial information technology,although the microgrid has achieved more fruitful results in its working mechanism and control methods,the imbalance of power supply is still one of the main problems in the development of microgrid technology.In the context of the application of energy Internet,this paper takes the household power router as the research object to study the coordination control of the household power router,so as to achieve the balance and stability of the energy flow among the ports.Firstly,based on literature research,the relationship between power routers and energy Internet,microgrid and distributed generation,as well as several common control modes and common port topology circuits of power routers are summarized.According to the analysis and functional selection,the household power router in this paper adopts the basic architecture of DC bus,the AC port adopts the topology of full bridge circuit,and the DC port adopts the semi-bridge bidirectional DC-DC topology.Then,according to the design requirements of household power router,the bidirectional full bridge AC-DC converter with AC port is analyzed,and the direct power control strategy based on PI controller is designed on the basis of the established mathematical model.For the semi-bridge bidirectional DC-DC converter with DC port,modal analysis and mathematical model establishment are also carried out,and a double closed-loop control strategy based on PI controller is designed.Based on the idea of layered control,the converter control is separated from the power flow in the system.Finally,the bidirectional operation of the AC/DC port converter and the stability of the controller are verified by software simulation experiments in Matalab /Simulink.Finally,according to the results of the simulation experiment,the hardware and software of the power router system are designed,including the corresponding sampling circuit,driving circuit and protection circuit,etc.,and the sampling circuit and protection circuit are simulated in Multisim software to determine the circuit parameters,and finally the PCB circuit board is made.In terms of software design,the working modes of the power router were decomposed according to the working conditions of the power router.Finally,nine working modes were decomposed.On this basis,the main function control flow,the ADC sampling flow and the digital PID controller were designed.Finally,an experimental prototype of a four-port power router with a single port power of 5k W is built,and the verification experiments corresponding to nine operating modes are completed.