Cascaded H-Bridge Multilevel Inverter Based DSTATCOM for Mitigation of Harmonics to Improve Power Quality

The increased rate of power electronics devices is mostly in distribution side can cause the current and voltage distortions in the power system results disturbed power quality. It is very much important to give attention on PQ issue, negligence may cause severe damage to the system. Due to some situations like active and reactive power exchange, balancing the load condition, harmonics, sag, swell, different kinds of faults and so on causes the systems power quality. Non linear load is the major cause for the production of harmonics in the system. To amplify these situations need of CPD like DSTATCOM. In that CHB based 7 level DSTATCOM is a high power device used to mitigate harmonics distortions to reduce the PQ problems and improve power factor. In this proposed work LSPWM technique supports to CHB for the applications of DSTATCOM. The reference current signals for generation of switching signals of multilevel inverter are obtained using SRF theory. THD calculated of non-linear load and compared with and without DSTATCOM. This work has been simulated in Matlab/Simulink environment.