Distributed photovoltaic power single-phase flexible series/parallel power interface

The invention discloses a distributed photovoltaic power single-phase flexible series/parallel power interface which is formed by a DC/DC converter, a DC/AC converter and a flexible series/parallel switching circuit, wherein the DC/DC converter adopts a BUCK-BOOST chopper circuit where double controllable power devices are connected in parallel; the DC/AC converter adopts a fully-controlled single-phase voltage inverter circuit; and the flexible series/parallel switching circuit is formed by solid-state switches. The power interface can automatically adjust connection mode of a distributed photovoltaic power and a main power grid and operation topology of the power interface according to external information and instructions, and has the functions of active power transmission, reactive power compensation, dynamic voltage recovery, endpoint voltage stabilization, line voltage adjustment, voltage harmonic compensation and current harmonic compensation and the like. The power interface can reduce equipment investment and operation power consumption; the power interface can be simplified and can obtain high effect; and therefore, good combination of high efficiency, economy and reliability can be realized.