Multiplexing type integrated topological structure based on photovoltaic energy storage UPQC

The invention discloses a UPQC multiplexing type integrated topological structure based on photovoltaic energy storage, and relates to the field of electric energy converters. The UPQC mainly solves the power grid fluctuation and improves the electric energy quality through a direct current bus capacitor, and in the actual application process, when the power grid voltage suffers from sudden flicker and sudden drop, a common direct current bus capacitor cannot provide enough compensation depth. The system comprises a series SAPF, a parallel PAPF, a DC bus capacitor, a power grid side, a load side, a photovoltaic power supply, an energy storage device and a DC/DC converter, and the photovoltaic power supply and the energy storage device are connected in parallel to an input side DC bus of the DC/DC converter. A single-phase bridge arm of the buck/boost DC-DC converter BBD and a single-phase bridge arm of the three-phase voltage source converter VSI are connected and integrated through a three-switch tube bridge