Research On Distributed Micro Grid Photovoltaic Inverter System

Recently,With the development of society,the demand for energy is increasing day by day,the energy crisis and environmental deterioration are becoming more and more serious.Solar energy,as a renewable energy with great development potential,has gradually entered people's field of vision.At present the development and utilization of solar energy has many kinds,among which is the development prospects of photovoltaic power generation,including distributed photovoltaic power generation due to its low voltage level,near the load has become the focus of research.In this paper,the grid connected power generation system is studied,A 10 k W photovoltaic grid connected generation system is designed and the control strategy of grid connected inverter is analyzed.First of all,this paper introduces the significance of photovoltaic power generation research and development status at home and abroad,Based on the analysis of the characteristics of photovoltaic cells,the photovoltaic cells are simulated and analyzed,This paper focuses on several methods of maximum power tracking,and proposes an improved MPPT.DC-DC boost module and DC-AC inverter module are designed,The former DC-DC uses a dual boost boost circuit to provide a stable voltage for the second stage,The latter DC-AC module lists the type of grid connected inverter,and determines the topology of three-phase grid connected inverter,The mathematical model of grid connected mode is established in three coordinate systems of abc,?? and dq respectively,Two control strategies of voltage vector control and direct power control are analyzed and compared,The voltage vector control strategy based on the design of a phase-locked loop of Nikai Hiroyoshi integral and its simulation study,compares the advantages and disadvantages of the traditional PLL and generalized integral lock,completed the design of the inverter,the method is verified by simulation of the.Finally,the core of the whole system using STM32F051 microcontroller,the power system component models and parameters of the design,the drive circuit,current and voltage sampling circuit,auxiliary power supply circuit of the hardware design and software realization for the whole diagram,realize energy improvement and product laid the foundation.