and an oscillating component (and ). The oscillating component of is extracted with the help of low pass filter (LPF) and a subtractor. As complete reactive current () and unbalance component () should be supplied from DSTATCOM, no LPFs are required for q-axisand 0-axis components. The extracted signals are transformed back to abc frame (), which are fed to a current controller for generation of switching signals for VSC.
  1. Reference current generation during VCM operation:The generation of reference signal during phenomenon of voltage unbalance (VCM operation) is carried out using a novel concept of single phase SRF theory which can typically be explained as follows: