Construction of a Prototype D-Statcom for Voltage Sag Mitigation

This paper presents the construction of a prototype distribution static compensator
(D-STATCOM) for load compensation in an unbalanced distribution system. The D
STATCOM is intended to replace the widely used static var compensator (SVC). The
compensation scheme of the D-STATCOM is derived using the symmetrical component
method. In this work, the 12-pulse D-STATCOM configuration with IGBT has been
designed and the graphic based models of the D-STATCOM have been developed using
the PSCAD/EMTDC electromagnetic transient simulation program. Accordingly,
simulation is first carried out to illustrate the use of D-STATCOM in mitigating voltage sag
in a distribution system. The D-STATCOM has been developed using SPWM controller to
achieve excellent overall performance. Simulation results prove that the D-STATCOM is
capable of mitigating voltage sag by controlling SPWM of the system using SPWM board.