This paper proposes an improved hybrid distribution static compensator (DSTATCOM) topology to address some practical issues such as power rating, filter size, compensation performance, and power loss. An LCL filter has been used at the front end of voltage source inverter (VSI) which provides better switching harmonics elimination while using much smaller value of inductor as compared to traditional L filter. A capacitor is used in series with LCL filter to reduce the dc link voltage of the DSTATCOM. This consequently reduces the power rating of VSI. With reduced dc link voltage, voltage across the shunt capacitor of LCL filter will also be less. It will reduce the power losses in the damping resistor as compared to traditional LCL filter with passive damping. Therefore, proposed DSTATCOM topology will have reduced weight, cost, rating, and size with improved efficiency and current compensation capability compared to traditional topology. A systematic procedure to design the components of passive filter has been presented. Effectiveness of the proposed DSTATCOM topology over traditional topologies is validated through both simulation and experimental studies.
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