Built-in Parallel Time-sharing Selector Switch Full-bridge Buck Type Single-stage Multi-input Inverter

With the development of the economy,the use of traditional fossil energy such as coal and oil is increasing rapidly.Because of the non-renewability of traditional fossil energy and pollution to the environment,it is particularly important to seek alternatives to fossil energy.Solar energy,wind power,fuel cells and other new energy resources are abundant,generally have the characteristics of renewable,low carbon content,little pollution to the environment,and are high-quality clean energy.However,a single new energy generation method usually has defects such as unstable power supply,discontinuous,and climatic conditions,and cannot guarantee continuous and stable supply of electric energy.Therefore,we need to combine a variety of new energy sources to jointly generate electricity to ensure the stability of the power supply system and the flexibility of multiple input sources to achieve full and rational use of new energy.In this paper,based on the single-input DC-converter two-stage multi-input inverter and multi-input DC converter type two-stage multi-input inverter,the built-in parallel time-sharing selection switch full-bridge Buck type single-stage multi-multiple Input the circuit topology and energy management control strategy of the inverter,and carry out in-depth theoretical analysis and simulation research on key technologies such as circuit topology,energy management control strategy,power supply mode,principle characteristics,and main circuit parameter design.in conclusion.The proposed built-in parallel time-sharing selection switch full-bridge Buck type single-stage multi-input inverter has a circuit topology consisting of input filter capacitor,built-in parallel time-sharing selection switch,inverter bridge,filter inductor,output transformer,and output filter capacitor.Consistently cascading,using the maximum power output energy management control strategy.The so-called maximum power output energy management control strategy means that the first,second,...,and n input sources are output to the load with maximum power,eliminating the battery energy storage equipment,and realizing the requirement for full utilization of energy by the grid-connected power generation system.If the battery is connected and discharged at the output end,the output voltage(current)of the independent power supply system can be stabilized.In-depth analysis of the steady-state principle of the built-in parallel time-sharing selector switch full-bridge Buck single-stage multi-input inverter,including operating mode,high-frequency switching process,output voltage DC bias,switching spike in a low-frequency cycle Suppression,etc.The small-signal model of the system is established by state space averaging method and the corresponding control loop is designed.The design criteria of main circuit parameters such as input and output filters,transformer turns ratio,power switching voltage and current stress are derived.Using the proposed circuit topology and energy management control strategy,a 3kVA 240-360 VDC / 220V50 HzAC built-in parallel time-sharing selection switch full-bridge Buck single-stage multi-input inverter system is designed,which is stabilized by PSIM software.Dynamic simulation analysis.The simulation results show that the proposed inverter system has excellent circuit structure,single-stage power conversion,high conversion efficiency,electrical isolation between AC load and multiple input sources,and high output waveform quality.It proves the proposed circuit topology and energy management.The feasibility and correctness of the control strategy provides an effective new method for multi-input source inverter.