Design And Research On Topologies Of Photovoltaic Micro-inverter

With the development of society, the improvement of people’s live level, the extension ofthe average life expectancy, lead to the world population is more and more, growingconsumption of energy, the energy crisis is also increasing. Therefore finding, researching anddeveloping a new kind of energy is urgenter and urgenter, solar photovoltaic power generationis used as solar energy’s utilization mode of new energy and has good development prospect,which cause wide concern.This paper first introduces the background and significance of the photovoltaic powergeneration. Then it introduces the current research status of the photovoltaic power generation,main including the topology, control strategy of MPPT and islanding detection. Finally, adiscussion for micro-photovoltaic system in the photovoltaic grid power generation systemshas been done. Analyze advantages and current development status of the micro-photovoltaicgrid inverters.For the design of micro photovoltaic grid-connected inverter in this article, giving itsoverall structure diagram, the detail design to the hardware structure of the main circuit andintroducing the various parts of the main circuit working principle in detail. Finally, thehardware structure of the detection circuit, clamp circuit and drive circuit are given, and abrief analysis of its working principle.For the system design in this paper, give the overall control block diagram, analyze itscontrol strategy, including digital lock grid voltage, maximum power point tracking (MPPT),grid control strategy and islanding detection. In this paper, a kind of accurate lock power gridvoltage phase method that solve to hardware filtering and digital computing project causingthe phase delay problems, can accurately achieve zero delay phase lock.Finally, take the simulation platform in kind for the micro-photovoltaic system design inthis paper so that the parameters of the simulation platform can be as close as possible to theactual experimental platform, do simulation studies by the simulation results, demonstrate therationality of hardware design and the feasiblity of network control strategy. Use ofsimulation results to optimize theoretical design method and reduces the workload during theexperiment. Preliminary experimental validation for the micro photovoltaic grid-connectedinverter system design in this paper, experiments to further verify the feasibility of theprogram design, as well as the correct of theoretical analysis.