Srf theory based control of d-statcom for linear and nonlinear loads

ABSTRACT The presence of harmonics in power supply network poses a severe power quality problem that results in huge power losses in distribution, interference problems to the parallel running communication lines and, sometimes, in operation failures of electronic equipment. D-STATCOM are employed to feed the required reactive power demand, suppress the current harmonics and reduce the total harmonic distortion (THD) in the load. The voltage source converter (VSC) is the core of a D-STATCOM. The hysteresis current control is an indirect method of controlling the VSC. In this paper, Synchronous Reference Frame (SRF) theory has been implemented for the generation of reference current signals for the controller. This paper investigates the effectiveness of the proposed model in mitigation of harmonics currents by modelling a 3-φ three-wire DSTATCOM based on SRF theory. Simulation results indicate that the proposed D-STATCOM can restrain harmonics of electrical source current effectively.