Research On Grid-Connected Inverter Based On Proportional-Resonant Control And Repetitive Control

With the development of human economy and society,the traditional power-systems with the properties of high pollution,low efficiency,and non-reproduction has been gradually eliminated by our daily life.Also,our needs to the power,which is sustainable,clean and efficient,is increasing.Considering the situation that the traditional thermal power system is difficult to reach our requirements to the power source and quality,finding a way to provide high quality and renewable clean power source becomes the key point of the power electronics science.This paper will focus on the popular renewable energy: solar energy.First,the introduction of solar power generation system is given,including its development and application in various fields of other areas,and the research direction of the grid-connected inverter technology.Then,according to the principle of the grid-connected inverter,we focus on the closed loop control methods based on the DC/AC part of the single-phase inverter in grid-connected system.The paper proposes a compound control strategy which combines the proportional-resonant and repetitive control strategies.We simulated the single-phase inverter by using Matlab to compare our compound control strategy and other two strategies.Besides,we used the hardware design of the low-power to test the device through the DSP for the three control strategies.By completing the simulating experiments,we made the current follows the public grid voltage with the same frequency and phase.The experimental results proved that the compound control strategy has better inhibitory to the periodic interference with a better output waveform.