Simulation on the Boost-Buck Current Compensation Device of PV Grid Connection and Active Power Filter All-in-One Machine

This paper first analyzed the alternating current AC/DC power decoupling working mechanism of photovoltaic (PV) grid connection and active power filter all-in-one machine, then put forward Boost-Buck parallel current compensation circuit and analyzed its working principle. Simultaneously, the thin-film capacitor C_dc in DC side was calculated, and finally the simulation model of current compensation device based on the Boost-Buck was established. The simulation results show that the thin-film capacitor with a small capacity (100–200 μF) can reduce the voltage fluctuation and stabilize MPPT working point as well as solve the dilemma that the life of grid-connected system is limited by power decoupling electrolytic capacitor, which provides a reliable hardware foundation for realizing the PV grid-connected and active power filter all-in-one machine.