Photovoltaic Inverter Control System And Its Engineering Application

Solar energy is a widely existing renewable energy in nature.It has the characteristics of easy access,clean,no pollution and so on.The PV inverter is used as the most important device of energy conversion in photovoltaic system,can be in the nature of the conversion of solar energy needed for the production of human life in the study of new electric energy,high reliability,high efficiency photovoltaic inverter to alleviate the energy crisis,and promote economic development is of great significance.Research on photovoltaic maximum power point tracking problem and related algorithms,this paper analyzes the working characteristics of the photovoltaic cell,the MATLAB simulation model was established;The maximum power point tracking in the photovoltaic cell the maximum power tracking problem is verified by simulation.In order to realize the inverter current track the grid voltage problem beat,the three-phase two-stage grid connected inverter as the research object,analyzes the application of SPWM technology in the modulation method of three-phase inverter,the system simulation model of double loop PI control strategy of grid connected and built the current loop and voltage with current feed forward function of the outer ring.The simulation results show that compared with the general double closed-loop control strategy,the double closed-loop control strategy with current feed forward function can realize grid connected control of inverter.The inverter current can track the network side voltage without difference,the sine degree is good,the harmonic is small,and the inverter can adjust the power output fast when the illumination intensity changes.