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The Flexible Alternating Current Transmission Systems (FACTS) device deals with the control of power flow, alternating current of transmission line and immediately respond towards the stability problems of the system. The present paper show that how the FACTS device STATCOM enhance the dynamic response and voltage flicker in distribution network of the power systems. In MATLAB a simplified distribution system is modeled and the find out the desired objectives. D-STATCOM changes from inductive to capacitive operation, the modulation index of the PWM inverter is increased from 0.56 to 0.9 which corresponds to a proportional increase in inverter voltage. Reversing of reactive power is very fast, about one cycle, as observed on D-STATCOM current. Observed on Scope that voltage fluctuation at bus B3 is now reduced to +/- 0.7 %. The D-STATCOM compensates voltage by injecting a reactive current modulated and varying between 0.6 pu capacitive when voltage is low and 0.6 pu inductive when voltage is high.

The combination of series and parallel connected PV modules made Photovoltaic (PV) generator. In this PV generator the level of current is increased by parallel connection and voltage level is increased by series connection. In grid connected applications high level of voltage is require for synchronizing the system with connected PV generator. PV generator operation gives harmful effects due to partial shading. The series connection is more prone to these effects than a parallel connection. In this thesis simulation model of PV generator is made by using MATLAB Simulink software and different configuration analysis can be taken out.