A Single-Phase Dual-Stage PV-Grid System with Active\ud Filtering

摘要

Integrating photovoltaic based electricity into the grid and power quality\udimprovement have become two major issues in electrical system. Formerly,\udthese can be solved by using two converter systems separately, a PV-Grid\udSystem and an active power filter. But recent technology uses only a\udconverter system to do both function. An existed shunt active power filter\ud(SAPF) can be modified to form a dual-stage PV-Grid with active filtering\udcapability. In this paper, a PV-Grid System that is capable to transfer all\udpower generated by PV modules and reduce harmonic contents is proposed.\udThe system was formed by connecting a boost chopper as a Maximum Power\udPoint Tracker and PV modules to the DC-link capacitor of a single-phase\udSAPF. It just needed a current transducer and also required simpler control\udcircuits. A voltage controller was needed to achieve power equilibrium while\uda current controller was needed to make the grid current sinusoidal with unity\udpower factor. To verify the analysis, simulations and experiments were done.