Study On Control Strategy For Grid-connected Inverter With LCL Filter

Energy is one of the five major elements of human survival, is the importantstrategic materials for national economic and social development, no development ofhuman society will remain stagnant energy. In the face of the current serious energycrisis, we should vigorously develop renewable energy power generation. At present,the main application of renewable energy power generation is grid power generation,grid generation system to the grid current of electric energy is very high qualityrequirements, high quality grid connected inverter current control technology is ofgreat significance.This paper firstly analyzes the current direction of development of new energypower generation is high power grid connected power generation technology, whiletype LCL filter in the high-power applications has great advantages, expounds thesignificance of research on LCL control strategy of grid connected inverter. Secondly,this type of LCL inverter control technology to do a systematic study, a detaileddiscussion of the characteristics of passive damping control and active dampingcontrol strategy, parameter design method, inhibition of disturbance power. Onceagain, the PI control parameters in the lack of ability of the grid current control, areanalyzed and studied at the PR controller and a resonant compensator, the quasi PRcontroller and a resonant compensator to enhance the performance of the controlsystem, and the design method of the corresponding parameters. Finally, studies theapplication of repetitive control strategy in the control current of grid connectedinverter technology, the grid voltage harmonics compensation technology andrepetitive controller design and parameter tuning method. Finally, simulation platformis built by using Matlab/simulink software, and according to the parameter design,build the simulation model of LCL inverter control strategy, experimental verificationof the simulation.