Scenery Complementary Grid-connected Inverter Control Strategy Research

The system of grid-connected wind/solar hybrid generation plays animportant role in relieving the load of local power grid, shaving the peak ofelectric power system and saving traditional energy, therefore the research ofgrid-connected wind/solar hybrid generation is much valuable for economy andsociety. However, in the scenery complementary power generation in powerelectronic devices are used, the corresponding produced a lot of harmonicpollution which influence the voltage quality of the grid.This paper through to analysis the working principle of the grid-connectedinverter and active power filter, there topology and control strategy ofcomparative, unified there control thought. With expand the function of existinggrid inverter makes the inverter can meet the scenery complementary powergeneration and also can be an active power filter to suppress the harmonic ofsystem. In this paper, the system control strategy have two important aspects:one of them is a detecting method for harmonics and reactive currents, and theother is the control method of main circuit. The method is carried out in-depthstudy. First of all,this paper introduces the basic operation principle of the wind/salor grid-connect power generation system. Second, the control strategy ofgrid-connected inverter is analyzed in detail.Third, the inverter main circuit andcontrol method using the SPWM control method, and APF tracking currentcontrol method of triangular wave comparison method and combined, theinverter and APF function integration.The specific technologies involved in system are analyzed in theory andsimulation, including reactive and harmonic current detecting technology,instruction current synthesis algorithm, the control strategy of inverter. Finally,the use MATLAB on unified control system simulation, the results proved thatthe system structure and the control strategy is feasible and correct.