Phase-controlled rectification charging device and method for energy storage unit of dynamic voltage restorer

The invention provides an energy storage unit phase-controlled rectification charging device and method of a dynamic voltage restorer, and belongs to the technical field of dynamic voltage restorers. The input end of the double-loop static change-over switch is used for being connected with commercial power, a first loop of the double-loop static change-over switch is used for being connected with a load, a second loop of the double-loop static change-over switch is connected with the bidirectional converter, and the bidirectional converter is used for being connected with the energy storage unit. The second loop is switched on to charge the energy storage unit when the mains supply output voltage is normal; the controller is connected with the double-loop static change-over switch and used for controlling the conduction angle of the thyristor of the second loop according to the direct-current charging voltage and the direct-current charging current of the energy storage unit so as to achieve phase-controlled