An Improved New Technique to Compensate Reactive and Nonlinear Loads by Hybrid DSTATCOM Topology

This project presents a control algorithm based on enhanced phase locked loop (EPLL) for distribution static
compensator (DSTATCOM) to compensate reactive power, to provide load balancing, to eliminate harmonics, to
correct power factor, and to regulate point of common coupling (PCC) voltages. Under linear and nonlinear
loads An LCL filter has been used at the front end of a voltage source inverter (VSI), which provides better
switching harmonics elimination while using much smaller value of an inductor as compared with the traditional
L filter. A capacitor is used in series with an LCL filter to reduce the dc-link voltage of the DSTATCOM. This
consequently reduces the power rating of the VSI. With reduced dc-link voltage, the voltage across the shunt
capacitor of the LCL filter will be also less. It will reduce the power losses in the damping resistor as compared
with the traditional LCL filter with passive damping. Therefore, the proposed DSTATCOM topology will have
reduced weight, cost, rating, and size with improved efficiency and current compensation capability compared
with the traditional topology. A systematic procedure to design the components of the passive filter has been
presented. The effectiveness of the proposed DSTATCOM topology over traditional topologies is validated
through both simulation and experimental studies.