(b)
Fig 7 Simulation results without compensation (a)Source current (b) %THD in phase-a of source current
Fig. 7 shows a system when DSTATCOM is not connected to it. It can be
seen that the source current is highly non-sinusoidal and also the
neutral current (In) is non-zero. Fig 6(b) shows the %THD in phase-a of
source current it is about 17.86 % before compensation.
It is seen in fig 8(a) and (b) after the DSTATCOM is connected to the
system the source current becomes sinusoidal and in phase with the
source voltage. Fig 8(c) shows the DSTATCOM injected current into the
distribution system. The %THD in phase-a of source current has now been
reduced to 0.68% which is well within limit of 5% according to IEEE
standard 519, this can be seen from fig. 8(d)