Cascaded h-bridge multilevel converter based d-statcom

The aim of this thesis is to study the power quality of electrical power system based on Cascaded H-Bridge multilevel converter D-STATCOM. The power system simulation has been done in computer software. Modulation technique used is Space Vector Pulse Width Modulation, because of its advantages over other techniques. But the problem of this technique is implementation, due to its complexity for high number voltage levels. Mostly power quality is affected by the types of loads connected at the distribution level of electrical power systems or by any type of faults. Inductive type of loads connected to the system creates a small dip in the power quality which should not be compromised. It can be seriously harmful for both the power system and for the consumers of power. Different type of compensation devices are used to sort out this problem. One of the compensation devices is D-STATCOM which is connected in parallel to the system near to the distribution point to overcome the power quality problems. D-STATCOM can absorb as well as inject the reactive power to keep system at steady state.