Reaserch Of Micro Inverter On Grid Photovoltaic

With the rapid development of our society, limited energy consumption, energy crisis isapproaching, so the development and research of new energy plays an important role inhuman society as a whole.The photovoltaic (pv) as the representative of green energy, manycountries are constantly on the continuous research, on how to improve the efficiency, andphotovoltaic power generation is an important part of our research, so this article is based onthis study, specific as follows:Firstly, this paper analyzes the development of photovoltaic(pv) grid inverter technologyat home and abroad,then the direction of this paper is determined.Secondly, this paper analyzed and compared typical inverter topology,the scheme of thepv grid inverter is determined.Then it designs the Boost structure of DC/DC circuitrespectively, and the single-phase bridge type DC/AC circuit.Then, this paper analyzes the photovoltaic panels volt-ampere characteristics and therelationship between voltage and power. It compares several typical MPPT algorithm, anddetermine the MPPT control strategy. It dynamic behavior of the MPPT control is studiedthrough simulation.Finally, it introduces how to restrain the system’s internal and external interferenceproblems, so it mainly introduces the technology of immunity, and grid control based on thetechnology of the immunity system is introduced in this paper. First introduced the ADRC,then a detailed analysis of the immunity of three parts, including tracking differentiator andextended state observer and nonlinear state error rate of the second analysis based on ADRCgrid system,finally it carrys on the simulation, and it compares this with the traditional PID,and then it concludes that the ADRC advantages.Through the result we may realize the hugeadvantage of ADRC.