Last some decades the increase the demand of electricity, now it is used mostly bulk power transmission system over long distances and it is interconnected to grid system. The generation of HVDC, the growth of power demand for consumption and utility. Now a day HVDC systemic good solution over HVAC system. My scope of this research on focused on use and development of HVDC and study the ac to dc and dc to ac converter this thesis the compression between HVDC and HVAC overhead transmission system and to study of network of HVDC system. In this research HVDC system, mainly VSC-HVDC is used as interface to interconnected independent power provider system to grid system. There are some advantage due to fault accurse, it is independent of active power and reactive power. VSC-HVDC have advantages to protect integration of IPPs, interconnected to grid for stabilization. MATLAB/Simulink simulations for different grid connection for VSC-HVDC system. Due to IPPs technology model performs are studies due disturbance analysis of dynamic response with help of. MATLAB/Simulink simulations. So that the Simulation is satisfied condition and power quality improvement. And due to fault occur in VSC-HVDC system to prevent the propagation from grid to integrated IPPs units.