Research On The New Type Circuit Of Inverter

Under the serious situation of shortage of the resources,the exploration and research of new energy sources is becoming more and more important,many new energy sources of solar energy thanks to its green,clean,inexhaustible,energy conversion is simple,power generation system work stability is high and easy to control,which get more and more attention.As a bridge between photovoltaic power generation and power grid,the study of the inverter is particularly important.The main function of the DC/DC converter of the inverter is to provide a stable DC bus voltage for the post inverter bridge,So the research on the power consumption,the ripple coefficient of the output voltage and current,and the loss of the switch of the DC / DC converter topology of the PV inverter is of great significance to the whole inverter research.Firstly,the paper introduces the application of power electronics in the inverter,analyzes the development status of the switching voltage,mainly from the circuit topology structure,modeling method,control method of DC/DC converter and the research,and applies basic Buck and the Boost topology structure into a new topological structure.Then,a new type of double-power buck inverter is designed,and the working principle of the circuit topology is analyzed in detail.The parameters of each device in the circuit are calculated,and the stability analysis of the system is carried out by using the transfer function of the system.And the correction of the open-loop system is completed in the Rltool environment,the parameters of PID controller are obtained by using the transfer function of the feedback system and verify the circuit of the closedloop system.Modeling in MATLAB/Simulink,the simulation results shows the advantages of the new circuit topology structure.Finally,a new single-supply dual-Boost circuit is proposed for multi-level inverter.The working principle of the four-level level provided by the pre-stage circuit is analyzed.The working principle of the post-stage DC-AC inverter bridge,the working principle and implementation method of DPWM1(symmetrical flat top wave)are analyzed for the four-level of the pre-stage.In the Matlab / Simulink environment,the circuit diagram of the circuit topology is established,and the simulation experiment is carried out with the DPWM1 modulation method.The simulation results are verified the correctness and superiority of the new single-supply two-stage inverter and its modulation strategy are verified.