Research On High Gain Coupled Inductance Combined Buck-Boost-Zeta Converter

Since the beginning of the 21 st century,the energy crisis and environmental pollution have become increasingly serious,and the demand for renewable energy has been increasing.With the continuous development of modern power electronics technology,green renewable energy represented by photovoltaic power generation,wind power generation,etc.has developed rapidly in recent years.And now the new energy power generation technology has developed from the early large-scale grid-connected power generation to the distributed power generation technology.For distributed photovoltaic power generation systems,the output voltage of the photovoltaic panel is low,and it cannot reach the voltage level of grid-connected equipment or transmission equipment.It is necessary to multiply the lower voltage level by a high-level DC / DC converter.Therefore,research on high-gain,high-efficiency DC / DC converters has gradually become a hot spot for domestic scholars.First,the Buck-Boost converter and Zeta converter are used as the starting point.The two converters are input parallel and output series combined,sharing the structure of the input terminal.A combined Buck-Boost-Zeta converter is proposed.Compared with Buck-Boost converter and Zeta converter,the voltage gain of this converter is significantly improved.The working principle of the converter is analyzed and a series of superimposed expansion structures of combined Buck-Boost-Zeta converter are given.Then,on the basis of the combined Buck-Boost-Zeta converter,the energy storage inductor is replaced by a coupled inductance structure,and the secondary side combines the diode-capacitor voltage doubler branch.A high-gain coupled inductance combined Buck-Boost-Zeta converter is proposed.This converter maintains the voltage gain while retaining the continuous output current of the Zeta converter.The diode-capacitor branch of the converter is used as a passive clamp to absorb the leakage inductance energy,which effectively suppresses the voltage spike generated by the switching transistor parasitic capacitance and leakage inductance resonance.The performance parameters of the converter in CCM mode and DCM mode and the boundary conditions of BCM mode are analyzed.The performance of other improved coupled inductance Buck-Boost converters is compared and the extended structure of coupled inductance combined Buck-Boost-Zeta converters is given.After that,the state-space averaging method was used to model the coupled inductance combined Buck-Boost-Zeta converter with a small signal,and a single voltage loop PID compensator was designed.Using MATLAB/Siulink and PSIM co-simulation technology,the coupled inductance combined Buck-Boost-Zeta converter is simulated and verified.Finally,the overall structure of the prototype is designed.And according to the overall design to build experimental prototypes for experimental verification,simulation and experiment verified the correctness of theoretical analysis.The paper has 47 pictures,5 tables,and 69 references.