Research On Grid-connected Inverter Based On DSP

With the continuous aggravation of the world’s energy and environmental problems,renewable energy development and utilization show a rapid development trend. Theinverter control strategy will largely affect the degree of good or bad performance ofdistributed power generation system. It is particularly important to inverter control. Thispaper relies on the small wind turbine generator as the research background studied andproduced by the automatic control technology institute of Shenyang University ofTechnology to focus on low power grid connected inverter. Use of grid-connected inverterreal-time tracking current control technology to realize distributed power grid side inverterharmonic fast inhibition, which makes the grid-connected inverter transfer active power tothe power grid and also realize the harmonic suppression effect.To solve the harmonics interference problem when accessing to grid with nonlinear load,a modified grid-connected inverter real-time tracking current harmonic suppressionmethod was used, the inverter voltage vector, current tracking and disturbance of themathematical model and control system simulation model of harmonic current real timetracking were established. First of all, through the Matlab/Simulink software on thegrid-connected inverter with nonlinear load control system to trace current harmonicsuppression control strategy simulation study, using real-time tracking current controltechnology to realize the network side of inverter output grid-connected current accuratelyand quickly adjusting, and the study of inverter is run independently on the load supplyprocess; Secondly, in order to obtain the high efficient and reliable DC input and ACoutput, the inverter booster circuit, full bridge inverter and drive circuit of the specificstructure scheme are studied. Finally, an object of grid inverter is build with dsPIC30F4011as the core component and base on based on HCPL-316J high-speed optocoupler for IGBTdrive and protection.The simulation result shows that the distributed power inverter with nonlinear load hasgood tracking effect and stronger robustness by the inverter control strategy of harmonic involved in the control in this paper. Using C language in MPLAB environment, the mainflow program of system and phase lock subroutine program and etc. are studied. Theexperimental result shows that the inverter output is stable and proves the design schemefeasible.