Research On An Improved High Boost Gain Trans-Z-Source Inverter

The methods of clean renewable electric power generation are replacing the methods of traditional electric power generation gradually.But most of these clean electric power generator can only output unstable DC power so it requires power conversion equipment to process them before they are supplied to users.Inverters are one of most sinificant part of power conversion and transmission systems but traditional inverters only can single step-up or step-down and it has a lager quantity of defects for example,output waveform distortion,complex control schemes,and extremely high requirements on the load.The Z-source inverter(ZSI),as it were,compensates for the shortcomings of traditional inverters.However,Z-source inverters also have drawbacks such as limited boost capability.For the above problems,this paper improve a single-stage adjustable voltage inverter topology with high boost voltage,the feasibility and boosting characteristics of the inverter topology are verified by simulation and a hardware experimental circuit.The main research content is as follows:To begin with,in the introduction part,this paper analyzes the research background and research significance of improved high boost gain Trans-Z-source inverten analyzes the limitations of traditional inverters and the research status of ZSI at home and abroad and the deficiency of ZSI.Subsequently,the working principle of the improved high boost gain Trans-Z-source inverter was analyzed and calculated,and the boost factor was figured out.And by comparing the traditional Trans-Z-source inverter,the boost characteristic of the improved high boost gain Trans-Z-source inverter is studied.Secondly,four different control strategies of inverter topology are analyzed,and the advantages and disadvantages of different control methods are studied by comparing the main performance parameters of the inverter under different control methods.The main circuit of the inverter system is designed,the parameter formulas of the inductor and capacitor in the Z-source network,the appropriate power device model,the design of the drive circuit and the output side LC filter.Last but not least.the design of the systen control circuit,including DSP electrical circuit,voltage detection circuit,current detection circuit.At the end of this paper,the feasibility of improved high boost gain Trans-Z-source inverter was verified by Matlab/Simulink software simulation,and the simulation results were analyzed in detail.Based on theoretical analysis and simulation research,a DSP TMS320F28335 chip was used as the main control chip to build an experimental circuit for a three-phase Trans-Z-source inverter with high boost gain.The experiment verifies the feasibility of the circuit topology and high boost capability.