Design And Research Of A Single-phase Off-grid Photovoltaic Inverter

Human society with the progress of technology and science is in rapiddevelopment, the demand for energy increases greatly at the same time. Now theworld stored energy is increasingly shortage, and a series of bad influences arethreatening people’s survival way. Then the model of sustainable green energy will bea promising research direction. Solar energy is one of them. Its advantages to clean,inexhaustible, be inexhaustible huge storage resources widely and no geographicalrestrictions become one of the most widely used green energy. In this paper weresearch and design the single phase grid PV inverter as the research object.The main research contents of this paper are as follows:1.Analyze and contrast the topology of the main circuit of inverter. And at thesame time, take the bipolar SPWM modulation and PI+repetitive control strategyafter analysis and comparison of the various modulation mode and control strategy ofinverter.2. Based on the topology analyze the main circuit of the system. Front stagebooster circuit of the inverter and the second inverter circuit are respectively analyzeddetailed modeling and design the filter last.3.Design a prototype of2.5kVA single phase inverter on the basis of theoreticalanalysis. Each module of the prototype hardware are analyzed and designed in detail,including the DC/DC converter and DC/AC inverter circuit and other key hardwaresystem, the buffer circuit, drive circuit, sampling circuit etc for example. And analyzethe main components of the power system loss.4.Finally the prototype is in the experimental verification. Verify theexperimental results through the relevant testing instrument observation of differentload conditions of various voltage and current waveforms. The experiments show thatthe photovoltaic inverter basic design to achieve the desired objectives.