A Flyback DC Chopper Type Single-stage Multi-input Distributed Power Generation System With Simultaneous Power Supply In Series

Traditional non renewable energy,such as coal and oil,not only has few reserves and is difficult to recycle,but also pollutes the environment seriously,which is not in line with the theme of green development.Therefore,renewable new energy,such as light energy and wind energy,which has abundant reserves and does not pollute the environment,is widely used in power generation occasions.However,new energy generation has the problem of discontinuity and instability,which can be effectively solved by the distributed generation system of new energy combined power supply.Therefore,it has become a research hotspot of power electronics and new energy generation technology to explore the distributed generation system of new energy combined power supply with excellent performance,which has important theoretical value and application value.After comparing the advantages and disadvantages of the traditional two-stage distributed generation system,this paper analyzes and studies the single-stage multi input distributed generation system of flyback DC chopper type with series simultaneous power supply,and conducts in-depth theoretical analysis,simulation and experimental research on the key technologies such as the circuit topology,energy management control strategy,steady-state principle characteristics,design of main circuit parameters,etc.,and obtains the important results make a conclusion.This paper analyzes and studies the circuit structure of the single-stage multi input distributed generation system with series and simultaneous supply of flyback DC chopper.It is composed of the single-stage multi input inverter with series and simultaneous supply of flyback DC chopper and the charge discharge converter with energy storage elements connected at the AC output side.The former is composed of multiple series and simultaneous selection of power switch circuit,combined bidirectional flyback DC chopper the output filter capacitor is composed of cascade in sequence,and the latter is equivalent to a single-stage bidirectional full bridge buck high frequency link rectifier / inverter.This paper analyzes and studies the multisource maximum power output energy management control strategy of the single-stage multi input distributed generation system with the output voltage independent control loop of the bi-directional charge discharge converter with the energy storage element,including the SPWM control loop of the single-stage multi input inverter and the quasi rectification single-stage multi input converter,this control strategy can realize the maximum power output of multiple input sources,the continuous stability of output voltage and the smooth and seamless switching of three power supply modes.This paper analyzes the high-frequency switching process of the single-stage multi input distributed generation system with series and simultaneous power supply flyback DC chopper,the low-frequency steady-state principle,duty cycle expression and external characteristic relationship of the single-stage multi input inverter,and deduces the key circuit parameters such as input-output filter,clamp capacitor,energy storage transformer and high-frequency transformer.Designed 1kVA 80-110VDC/220V50 HzAC series simultaneous power supply flyback DC chopper type single stage multi input distributed generation system.The Psim simulation and experimental results confirm the feasibility and advanced nature of the proposed distributed generation system,it has simple circuit structure,electrical isolation between multiple input source energy storage components,AC load,flexible duty cycle,low output voltage THD and strong carrying capacity.The advantages of three different power supply modes,such as smooth switching,provide an effective new method for distributed generation system.