Optimization And Design Of Control Method For Two-stage Inverter Power System

Traditional energy is an important issue in the 21 st century.The development and application of new energy,especially solar photovoltaic power generation technology,is regarded as one of the important means to solve the traditional energy problem,and has been vigorously researched and supported by various countries and fields around the world.As the core part of the solar photovoltaic power generation system,the inverter plays a decisive role in the cost life and efficiency performance of the whole system.Therefore,the analysis of inverter topology configuration and design optimization and the improvement and promotion of inverter modulation control strategy have important research significance to realize the cost reduction and efficiency increase of inverter.In this paper,a single-phase off-grid inverter system is designed,and the topology and principle of off-grid inverter,key technologies and modeling of control strategy,and software and hardware design of system prototype platform are studied and analyzed.The paper first adopted two-stage inverter topology control structure of the narrative,including topology structure level before the interleaved parallel Boost converter,after the H4 adopts full bridge converter,a control structure adopts level after level of points before the high frequency modulation method,coupling control is realized by two-stage converter topology,the two-stage topology control structure,It is defined as 1.5 level time-sharing topology control structure.Further,in the 1.5 stage time-sharing control strategy,the topology of front and rear stage converters are modeled and analyzed,and the analysis results are verified by Simulink simulation.On this basis,the adopted control strategy is compared with the traditional two-stage decoupling control strategy,and the control loop of the 1.5 stage time-sharing control strategy is modeled to analyze its control stability.Voltage closed-loop PI compensation was used to correct the system stability performance,and the rationality of modeling analysis and compensation correction design parameters was verified by Simulink simulation.Finally,on the basis of theoretical modeling analysis and simulation verification analysis,the hardware and software design of the inverter power system is carried out.Combined with the requirements of related design parameters,the inverter hardware parameters calculation and selection and circuit design.Draw the flow chart of software program and realize the digital control algorithm of inverter power supply software.A test and verification experimental platform for 2k W system prototype was built to verify the feasibility and stability of the 1.5 level time-sharing topology control structure and its superior performance in reducing cost and increasing efficiency.