ADAPTIVE CONTROL SCHEME FOR A DUAL TOPOLOGY OF UNIFIED POWER QUALITY CONDITIONER

Unified Power Quality Conditioner (UPQC) for harmonic elimination and simultaneous compensation of voltage and current, which improves the power quality offered for other harmonic sensitive loads. UPQC consist of combined series active power filter that compensates voltage harmonics of the power supply, and shunt active power filter that compensates harmonic currents of a non-linear load. In this paper a new control algorithm for the UPQC system is optimized and simplified without transformer voltage, load and filter current measurement, so that system performance is improved. The proposed system can able to compensate the nonlinear load condition and also ensure the sinusoidal voltage for the load in all three phases. This results in the better power quality. It is important to emphasize that the existing UPQC topologies does not have this capability. The simulation result is verified using MATLAB/SIMULINK