Design and simulation of dstatcom for power quality improvements

The increased perception in power quality topics has provided important changes and improvements in power electronics devices. This devices are used to maintain and improve the power quality and reliability of distribution system and to protect customers/users against disturbances generated by other users in the network. Distribution Static Compensator (DSTATCOM) is a shunt connected power electronic device that can quickly mitigate power quality disturbances in the system. The proposed DSTATCOM is connected in shunt to 400 V test system. Simulations have been performed to illustrate the effectiveness of the DSTATCOM. The results obtained from the simulations clearly showed that the designed DSTATCOM simultaneously performs the reactive power compensation, voltage regulation, harmonic elimination, load balancing, balanced voltage sag/swell and unbalanced voltage sag mitigation. Furthermore, by connecting a delta connected inductor-capacitor-inductor (LCL) passive filter at inverter output, the high order harmonics generated by the DSTATCOM can be easily and effectively eliminated. In this thesis, a proposed DSTATCOM that protects a 300-kVA sensitive load is analyzed, modeled and simulated. The performance and efficiency of the proposed system are tested with different simulation cases by PSCAD/EMTDC program.