Power Quality Improvement of Power Distribution Systems Using Improved DVR-PV Hybrid Scheme Based on Interleaved Chopper and Hysteresis Modulation

Dynamic Voltage Restorer (DVR) is one of the voltage compensation equipment. Voltage quality injected by of this equipment depends on the quality of DC link voltage and the type of control system modulation. The photovoltaic array can be used to store the DC link of this equipment. To increase the output voltage of the photovoltaic array to the required DC voltage level, a standard boost chopper is used which reduces the quality of the compensator voltage due to the high voltage ripple. Using well-designed choppers such as interleave can in addition to increasing the photovoltaic array voltage, reduce the ripple DC link voltage and thus the harmonic content of the voltage injected by the compensator. Applying appropriate pulse bandwidth modulation to the control system of this equipment can also be effective in reducing harmonic content and improving voltage quality. In this paper, in order to reduce the total harmonic distortion (THD) of the compensator injected voltage and consequently to improve the load voltage quality, the interleave boost converter at DC compensator link and the hysteresis modulation in the controller scheme of this hybrid compensator are used and the simulation results are presented. The result of the proposed system is compared with the results of the hybrid compensator based on conventional boost chopper and sinusoidal modulation.The simulations are done using Matlab/Simulink.