The Research And Realization Of 1kW Single-phase High-frequency Inverter For Photovoltaic System

As the world's population increase gradually, human beings energy consumption is also growing. With the dwindling of traditional fossil fuels, the worldwide energy crisis gradually emerging. The development of new energy to replace the traditional fossil fuel extremely urgent. Photovoltaic power generation as a green renewable energy technology, has gained the attention governments around the world. The solar PV inverter is one of the most important system of the solar photovoltaic system, so it's the main research contents in this paper.This paper introduces a design of a high frequency of the PV inverter with front stage based on Boost circuit. In the paper, firstly through theoretical analysis of Boost circuit, full-bridge inverter circuit and SPWM control technology used in the design of the system, design all parameters of the PV inverter main circuit. After that, modeling the PV inverter main circuit of a mathematical model, then use MATLAB / Simulink simulation tools to analysis.Secondly, reseach on the characteristics of the photovoltaic cells and the maximum power point tracking control methods, establishment the simulation models of the photovoltaic cells and maximum power point tracking (MPPT), as MPPT based on the perturbation and observation, and use MATLAB / Simulink simulation tools to analysis. With the core control component of TI's TMS320F28027, detailed designed the hardware of the control system, at the same time through software programming to achieve maximum power point tracking algorithm and the digital PID control algorithm in the system.Finally, made a model machine of 1kW, through to the model machine with load tests, test results show that all of the inverter performance indicators has matched the design requirements, proved correctness and the rationality of the whole system in the design of hardware and software.