A single-stage single-phase multifunctional grid interfaced system
has been proposed for feeding solar PV energy into the
distribution network and power quality improvement
simultaneously. The proposed system locally feeds the power to
loads which helps in reducing the distribution line losses.
Moreover, it also compensates for the reactive power and
harmonics, which further reduces losses in distribution line and
transformer. A robust PLL-less control has been proposed for
control of multifunctional VSC which has been tested under
abnormal grid conditions (voltage sag/swell). The performance
of the proposed control algorithm has been found to be good
even under abnormal grid conditions. Moreover, the performance
of the proposed control algorithm has been observed to be quite
satisfactory under load transients and steady-state conditions. A
wide variety of simulation and experimental results have
demonstrated all features of the proposed system. Not only
simulations but the experimental studies are also carried out at
full voltage and considerable power levels. The grid current
THD has been observed below 5% (satisfactory according to
IEEE-519 standard) even with nonlinear loads at PCC. The
simulations and experimental results have shown the feasibility
of the proposed system.