Modified Mechanism And Design Of Grid High Harmonic

In recent years, the pollution caused by harmonic become more and more serious in the power grid, which roots in nonlinear load widely used in the power grid, such as arc furnace, transformers, power electronic device, although this application produce considerable economic benefits, the harmonic pollution to power network bring serious influences and harms. The active power filter can effectively filter out the harmonic wave in the power grid, rising to purify the effect of power grid.Being based on the parallel type of active power filter as the foundation, this paper elaborates its working principle, and its mathematical model is derived also. Basing on the ip-iq by the method of SPWM control mode and hysteresis comparison control mode, this paper builds APF system, with three phase controlled rectifier circuit as a nonlinear load harmonic source and power grid as compensation object, this paper makes the simulation and the filtering effect contrast of construction of the APF system in the Matlab/Simulink software environment, selecting the better control strategies; By changing the main value of circuit inductance L, this paper summarizes the filtering effect by changing parameter; This paper verifies the effectiveness of the method of harmony, this paper verifies the effectiveness of no harmonic method evolved by ip-iq through the simulation; I finished the simulation design of grid high harmonic.This paper chooses DSPTMS320F2812for nuclear processor to set up the hardware circuit of active power filter system, including main circuit, detecting circuit, driving and protective circuit, power supply circuit. Finally, this paper gives the software flow charts of the active power filter.