Multi-winding Simultaneous/time-sharing Power Supply Boost Type Single-stage Multi-input High-frequency Link Grid-connected Inverter

Due to the shortage of resources,environmental pollution and non-renewability of traditional fossil energy,green energy such as solar energy and wind energy have received more and more attention.Photovoltaic,wind power,fuel cells,geothermal energy and other single new energy power generation usually have defects such as unstable power supply,discontinuous,and climatic conditions.In order to improve the stability and flexibility of the power supply system,and to realize the priority utilization and full utilization of energy,There is a need for a distributed generation system that is powered by a variety of new energy sources.This paper discusses three-stage multi-input inverters with single-input DC-converter and two-stage multi-input inverters with parallel-timed power supply,series simultaneous power supply,and multi-winding simultaneous/time-sharing power supply.On the basis of this,a multi-winding simultaneous/time-sharing Boost-type single-stage multi-input highfrequency link-connected inverter circuit topology and energy management control strategy are proposed,and the circuit topology of such a single-stage multi-input inverter is constructed.The key technologies such as energy management control strategy,principle characteristics and main circuit parameter design criteria have carried out in-depth theoretical analysis,simulation and experimental research,and obtained important conclusions.Multi-winding simultaneous/time-sharing power supply Boost type single-stage multi-input high-frequency grid-connected inverter circuit topology is a multi-input singleoutput high-frequency transformer that is isolated from each other with input filters and energy storage.The high-frequency inverter circuit of the inductor is connected with a common output-cycle transform filter circuit.Each high-frequency inverter circuit with input filter and energy storage inductor is composed of input filter,energy storage inductor,single input and single output.The high-frequency inverter circuit is sequentially cascaded,and the output cycle conversion filter circuit is composed of a cycle converter and an output filter in sequence,and a bypass switch is connected in parallel with each of the energy storage inductors.This single-stage multi-input inverter uses a nonlinear single-cycle maximum power output energy management control strategy with energy storage inductor current limiting.The steady-state principle characteristics of multi-winding simultaneous/time-sharing power supply Boost-type single-stage multi-input high-frequency grid-connected inverters in one power frequency cycle and the working principle in a high-frequency switching period are analyzed.The inverter includes three modes of operation of magnetizing,magnetizing,demagnetizing and freewheeling in one power frequency cycle,and includes twelve working intervals in one high frequency switching cycle.The external characteristic equation is derived by state space averaging method,and the design parameters of key circuit parameters such as energy storage inductor current limit value,energy storage inductance value,high frequency transformer turns ratio,input and output filter,power switching voltage and current stress are given.Using the proposed circuit topology and energy management control strategy,a 3kW 80-110VDC/220V50 HzAC multi-winding simultaneous/time-sharing Boost-type singlestage multi-input high-frequency grid-connected inverter is designed.The simulation and prototype experiments confirm the feasibility and correctness of the proposed circuit topology and energy management control strategy,and open up an effective way for multiinput source single-stage high efficiency inverter.