Design On Three-Phase Grid-Connected Photovoltaic Inverter

Since the world’s energy shortage and Environmental pollution aggravate, People are very concerned about the use of solar energy.And photovoltaic power generation as the main way of solar energy utilization,the study of it has been more and more attention.Photovoltaic power generation control system mainly includes two parts:the maximum power point of system tracking and grid inverter control.In this article,through analysis of several kinds of maximum power point tracking algorithm,the article is decided to adopt improved incremental conductance method for maximum power point tracking system.Compared to other several algorithms,this algorithm have obvious advantages in tracking speed, near the maximum power point of stability and oscillation size.And the algorithm conducted simulation verification on the MATLAB.Then this paper also analysis the several control strategies of grid inverter, this paper is decided to adopt deadbeat predictive direct power control to implement the system for grid interconnection of synchronization.The control method is compared with the traditional deadbeat control,it’s very good to solve the disadvantage of poor robustness,and with the instantaneous power instead of three phase current to modulation PWM wave,simplify the operation, improve the efficiency of the system.At the end of the paper on the MATLAB to build the model of the system,through the simulation results,it verify deadbeat predictions direct power control can be quickly,the stability to Complete the interconnection of power grids.